diff --git a/.circleci/config.yml b/.circleci/config.yml
new file mode 100644
index 0000000..e6e36d0
--- /dev/null
+++ b/.circleci/config.yml
@@ -0,0 +1,218 @@
+
+version: 2.1
+
+orbs:
+    codecov: 'codecov/codecov@3.0.0'
+
+.env_app: &env_app
+    SHELL: '/bin/bash'
+
+.env_composer: &env_composer
+    COMPOSER_NO_INTERACTION: '1'
+    COMPOSER_MEMORY_LIMIT: '-1'
+    COMPOSER_DISABLE_XDEBUG_WARN: '1'
+    COMPOSER_CACHE_DIR: '/home/circleci/.cache/composer'
+
+executors:
+    php_min:
+        resource_class: 'small'
+        environment:
+            <<: *env_app
+            <<: *env_composer
+        docker:
+            -
+                name: 'main'
+                image: 'cimg/php:7.2'
+
+    php_plus1:
+        resource_class: 'small'
+        environment:
+            <<: *env_app
+            <<: *env_composer
+        docker:
+            -
+                name: 'main'
+                image: 'cimg/php:7.3'
+
+    php_plus2:
+        resource_class: 'small'
+        environment:
+            <<: *env_app
+            <<: *env_composer
+        docker:
+            -
+                name: 'main'
+                image: 'cimg/php:7.4'
+
+    php_plus3:
+        resource_class: 'small'
+        environment:
+            <<: *env_app
+            <<: *env_composer
+        docker:
+            -
+                name: 'main'
+                image: 'cimg/php:8.0'
+
+    php_plus4:
+        resource_class: 'small'
+        environment:
+            <<: *env_app
+            <<: *env_composer
+        docker:
+            -
+                name: 'main'
+                image: 'cimg/php:8.1'
+
+    php_plus5:
+        resource_class: 'small'
+        environment:
+            <<: *env_app
+            <<: *env_composer
+        docker:
+            -
+                name: 'main'
+                image: 'cimg/php:8.2'
+
+    php_plus6:
+        resource_class: 'small'
+        environment:
+            <<: *env_app
+            <<: *env_composer
+        docker:
+            -
+                name: 'main'
+                image: 'cimg/php:8.3'
+
+commands:
+    install_php_extension_pcov:
+        description: 'Install PCOV PHP extension'
+        steps:
+            -
+                run:
+                    name: 'Install PCOV PHP extension - pecl install pcov'
+                    command: |-
+                        if php -m | grep pcov ; then
+                            exit 0
+                        fi
+
+                        sudo pecl install pcov
+                        if php -m | grep pcov ; then
+                            exit 0
+                        fi
+
+                        scanDir="$(php -i | grep --color=never --only-matching --perl-regexp '(?<=^Scan this dir for additional \.ini files => ).+')"
+                        echo 'extension=pcov' | sudo tee "${scanDir}/pcov.ini"
+                        php -m | grep pcov
+
+    composer_install:
+        description: 'Install Composer dependencies with cache restore and save'
+        steps:
+            -
+                restore_cache:
+                    name: 'Composer - cache restore'
+                    keys:
+                        - 'composer-{{ checksum "./composer.lock" }}-2'
+
+            -
+                run:
+                    name: 'Composer - install'
+                    command: >
+                        composer install --ansi --no-progress
+
+            -
+                save_cache:
+                    name: 'Composer - cache save'
+                    key: 'composer-{{ checksum "./composer.lock" }}-2'
+                    paths:
+                        - '~/.cache/composer/'
+
+    lint:
+        description: 'Run linters'
+        steps:
+            -
+                run:
+                    name: 'Run composer validate'
+                    command: |-
+                        composer validate
+            -
+                run:
+                    name: 'Run PHPCS'
+                    command: |-
+                        "$(composer config 'bin-dir')/phpcs"
+
+    test:
+        description: 'Run tests'
+        parameters:
+            executor:
+                type: 'string'
+        steps:
+            -
+                run:
+                    name: 'Test - Unit'
+                    command: |-
+                        mkdir -p '.cache' 'reports/human' 'reports/machine'
+                        "$(composer config 'bin-dir')/phpunit" --testsuite='Unit'
+            -
+                when:
+                    condition:
+                        equal: ['<<parameters.executor>>', 'php_min']
+                    steps:
+                        -
+                            codecov/upload:
+                                flags: 'unit'
+                                file: './reports/machine/coverage.clover.xml'
+            -
+                store_test_results:
+                    name: 'Store unit test results'
+                    path: './reports/machine/result.junit.xml'
+
+jobs:
+    build:
+        executor: 'php_min'
+        steps:
+            - 'checkout'
+            - 'composer_install'
+    lint:
+        executor: 'php_min'
+        steps:
+            - 'checkout'
+            - 'composer_install'
+            - 'lint'
+    test:
+        parameters:
+            executor:
+                type: 'string'
+        executor: '<<parameters.executor>>'
+        steps:
+            - 'checkout'
+            - 'install_php_extension_pcov'
+            - 'composer_install'
+            -
+                test:
+                    executor: '<<parameters.executor>>'
+
+workflows:
+    lint_and_test:
+        jobs:
+            -
+                build: {}
+            -
+                lint:
+                    requires:
+                        - 'build'
+            -
+                test:
+                    name: 'test_<<matrix.executor>>'
+                    requires:
+                        - 'build'
+                    matrix:
+                        parameters:
+                            executor:
+                                - 'php_min'
+                                - 'php_plus1'
+                                - 'php_plus2'
+                                - 'php_plus3'
+                                - 'php_plus4'
+                                - 'php_plus5'
+                                - 'php_plus6'
diff --git a/.coveralls.yml b/.coveralls.yml
deleted file mode 100644
index 90cf2a6..0000000
--- a/.coveralls.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-service_name: travis-ci
-coverage_clover: build/logs/clover.xml
-json_path: build/logs/coveralls-upload.json
\ No newline at end of file
diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..0d0b894
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,15 @@
+root = true
+
+[*]
+end_of_line = LF
+indent_style = space
+indent_size = 4
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[tests/fixtures/**]
+indent_style = unset
+indent_size = unset
+trim_trailing_whitespace = false
+insert_final_newline = false
diff --git a/.gitignore b/.gitignore
index d973270..de7157f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,20 @@
-.idea
-vendor/
-coverage/
-composer.lock
\ No newline at end of file
+### Common places for toolings.
+/.cache/
+/reports/
+
+
+### Composer.
+/vendor/
+/mindscreen-yarnlock-*.tar
+/mindscreen-yarnlock-*.tar.bz2
+/mindscreen-yarnlock-*.tar.gz
+/mindscreen-yarnlock-*.tgz
+/mindscreen-yarnlock-*.zip
+
+
+### PHPCS.
+/phpcs.xml
+
+
+### PHPUnit.
+/phpunit.xml
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 49c8169..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,30 +0,0 @@
-language: php
-php:
-  - 5.6
-  - 7.0
-
-
-install:
-  # Install composer packages
-  - travis_retry composer install --no-interaction --no-suggest
-  # Install coveralls.phar
-  - wget -c -nc --retry-connrefused --tries=0 https://github.com/php-coveralls/php-coveralls/releases/download/v2.0.0/php-coveralls.phar -O coveralls.phar
-  - chmod +x coveralls.phar
-  - php coveralls.phar --version
-
-# Create a storage folder for coverage report
-before_script:
-  - mkdir -p build/logs
-  - ls -al
-
-script:
-  - ./vendor/bin/phpunit --coverage-clover build/logs/clover.xml
-
-after_success:
-# Submit coverage report to Coveralls servers, see .coveralls.yml
- - travis_retry php coveralls.phar -v
-# Submit coverage report to codecov.io
- - bash <(curl -s https://codecov.io/bash)
-
-branches:
-  only: master
\ No newline at end of file
diff --git a/readme.md b/README.md
similarity index 82%
rename from readme.md
rename to README.md
index 74e9874..7051332 100644
--- a/readme.md
+++ b/README.md
@@ -1,8 +1,9 @@
-[![Build Status](https://travis-ci.org/mindscreen/yarnlock.svg?branch=master)](https://travis-ci.org/mindscreen/yarnlock)
-[![Coverage Status](https://coveralls.io/repos/github/mindscreen/yarnlock/badge.svg?branch=master)](https://coveralls.io/github/mindscreen/yarnlock?branch=master)
-
 # Mindscreen\YarnLock
 
+[![CircleCI](https://circleci.com/gh/mindscreen/yarnlock/tree/master.svg?style=svg)](https://circleci.com/gh/mindscreen/yarnlock/?branch=master)
+[![codecov](https://codecov.io/gh/mindscreen/yarnlock/branch/master/graph/badge.svg?token=HSF16OGPyr)](https://app.codecov.io/gh/mindscreen/yarnlock/branch/master)
+
+
 A php-package for parsing and evaluating the [yarn.lock](https://yarnpkg.com/lang/en/docs/yarn-lock/) format.
 
 ## Basic Usage
@@ -35,4 +36,4 @@ $yarnLock->calculateDepth($rootDependencies);
 
 // get the first two levels; the second argument is the exclusive upper limit
 $yarnLock->getPackagesByDepth(0, 2);
-```
\ No newline at end of file
+```
diff --git a/composer.json b/composer.json
index 313f413..ae66356 100644
--- a/composer.json
+++ b/composer.json
@@ -9,16 +9,42 @@
             "email": "matthias.klatte@mindscreen.de"
         }
     ],
-    "scripts": {
-        "test": "phpunit tests"
+    "config": {
+        "platform": {
+            "php": "7.2"
+        },
+        "optimize-autoloader": true,
+        "sort-packages": true
+    },
+    "require": {
+        "php": ">=7.2",
+        "ext-ctype": "*"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^8.5",
+        "squizlabs/php_codesniffer": "^3.9"
     },
-    "require": {},
     "autoload": {
         "psr-4": {
             "Mindscreen\\YarnLock\\": "src/"
         }
     },
-    "require-dev": {
-        "phpunit/phpunit": "^5"
+    "autoload-dev": {
+        "psr-4": {
+            "Mindscreen\\YarnLock\\Tests\\": "tests/src/"
+        }
+    },
+    "scripts": {
+        "lint": [
+            "@lint:composer-validate",
+            "@lint:phpcs"
+        ],
+        "lint:composer-validate": "\"${COMPOSER_BINARY}\" validate",
+        "lint:phpcs": "phpcs",
+        "test": [
+            "mkdir -p '.cache' 'reports/human' 'reports/machine'",
+            "@test:phpunit"
+        ],
+        "test:phpunit": "phpunit"
     }
 }
diff --git a/composer.lock b/composer.lock
new file mode 100644
index 0000000..cc9bb0e
--- /dev/null
+++ b/composer.lock
@@ -0,0 +1,1519 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "3fcb13280e03896a6bd6c1c73d3760d8",
+    "packages": [],
+    "packages-dev": [
+        {
+            "name": "doctrine/instantiator",
+            "version": "1.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/doctrine/instantiator.git",
+                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/doctrine/instantiator/zipball/0a0fa9780f5d4e507415a065172d26a98d02047b",
+                "reference": "0a0fa9780f5d4e507415a065172d26a98d02047b",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "require-dev": {
+                "doctrine/coding-standard": "^9 || ^11",
+                "ext-pdo": "*",
+                "ext-phar": "*",
+                "phpbench/phpbench": "^0.16 || ^1",
+                "phpstan/phpstan": "^1.4",
+                "phpstan/phpstan-phpunit": "^1",
+                "phpunit/phpunit": "^7.5 || ^8.5 || ^9.5",
+                "vimeo/psalm": "^4.30 || ^5.4"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Doctrine\\Instantiator\\": "src/Doctrine/Instantiator/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Marco Pivetta",
+                    "email": "ocramius@gmail.com",
+                    "homepage": "https://ocramius.github.io/"
+                }
+            ],
+            "description": "A small, lightweight utility to instantiate objects in PHP without invoking their constructors",
+            "homepage": "https://www.doctrine-project.org/projects/instantiator.html",
+            "keywords": [
+                "constructor",
+                "instantiate"
+            ],
+            "support": {
+                "issues": "https://github.com/doctrine/instantiator/issues",
+                "source": "https://github.com/doctrine/instantiator/tree/1.5.0"
+            },
+            "funding": [
+                {
+                    "url": "https://www.doctrine-project.org/sponsorship.html",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://www.patreon.com/phpdoctrine",
+                    "type": "patreon"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/doctrine%2Finstantiator",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-12-30T00:15:36+00:00"
+        },
+        {
+            "name": "myclabs/deep-copy",
+            "version": "1.11.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/myclabs/DeepCopy.git",
+                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/myclabs/DeepCopy/zipball/7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
+                "reference": "7284c22080590fb39f2ffa3e9057f10a4ddd0e0c",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.1 || ^8.0"
+            },
+            "conflict": {
+                "doctrine/collections": "<1.6.8",
+                "doctrine/common": "<2.13.3 || >=3,<3.2.2"
+            },
+            "require-dev": {
+                "doctrine/collections": "^1.6.8",
+                "doctrine/common": "^2.13.3 || ^3.2.2",
+                "phpunit/phpunit": "^7.5.20 || ^8.5.23 || ^9.5.13"
+            },
+            "type": "library",
+            "autoload": {
+                "files": [
+                    "src/DeepCopy/deep_copy.php"
+                ],
+                "psr-4": {
+                    "DeepCopy\\": "src/DeepCopy/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "description": "Create deep copies (clones) of your objects",
+            "keywords": [
+                "clone",
+                "copy",
+                "duplicate",
+                "object",
+                "object graph"
+            ],
+            "support": {
+                "issues": "https://github.com/myclabs/DeepCopy/issues",
+                "source": "https://github.com/myclabs/DeepCopy/tree/1.11.1"
+            },
+            "funding": [
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/myclabs/deep-copy",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-03-08T13:26:56+00:00"
+        },
+        {
+            "name": "phar-io/manifest",
+            "version": "2.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/manifest.git",
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/manifest/zipball/97803eca37d319dfa7826cc2437fc020857acb53",
+                "reference": "97803eca37d319dfa7826cc2437fc020857acb53",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-phar": "*",
+                "ext-xmlwriter": "*",
+                "phar-io/version": "^3.0.1",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Component for reading phar.io manifest information from a PHP Archive (PHAR)",
+            "support": {
+                "issues": "https://github.com/phar-io/manifest/issues",
+                "source": "https://github.com/phar-io/manifest/tree/2.0.3"
+            },
+            "time": "2021-07-20T11:28:43+00:00"
+        },
+        {
+            "name": "phar-io/version",
+            "version": "3.2.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/phar-io/version.git",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/phar-io/version/zipball/4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "reference": "4f7fd7836c6f332bb2933569e566a0d6c4cbed74",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Heuer",
+                    "email": "sebastian@phpeople.de",
+                    "role": "Developer"
+                },
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Library for handling version information and constraints",
+            "support": {
+                "issues": "https://github.com/phar-io/version/issues",
+                "source": "https://github.com/phar-io/version/tree/3.2.1"
+            },
+            "time": "2022-02-21T01:04:05+00:00"
+        },
+        {
+            "name": "phpunit/php-code-coverage",
+            "version": "7.0.15",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/php-code-coverage.git",
+                "reference": "819f92bba8b001d4363065928088de22f25a3a48"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/php-code-coverage/zipball/819f92bba8b001d4363065928088de22f25a3a48",
+                "reference": "819f92bba8b001d4363065928088de22f25a3a48",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-xmlwriter": "*",
+                "php": ">=7.2",
+                "phpunit/php-file-iterator": "^2.0.2",
+                "phpunit/php-text-template": "^1.2.1",
+                "phpunit/php-token-stream": "^3.1.3 || ^4.0",
+                "sebastian/code-unit-reverse-lookup": "^1.0.1",
+                "sebastian/environment": "^4.2.2",
+                "sebastian/version": "^2.0.1",
+                "theseer/tokenizer": "^1.1.3"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8.2.2"
+            },
+            "suggest": {
+                "ext-xdebug": "^2.7.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "7.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that provides collection, processing, and rendering functionality for PHP code coverage information.",
+            "homepage": "https://github.com/sebastianbergmann/php-code-coverage",
+            "keywords": [
+                "coverage",
+                "testing",
+                "xunit"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/php-code-coverage/issues",
+                "source": "https://github.com/sebastianbergmann/php-code-coverage/tree/7.0.15"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
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+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/global-state.git",
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+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2",
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+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "ext-dom": "*",
+                "phpunit/phpunit": "^8.0"
+            },
+            "suggest": {
+                "ext-uopz": "*"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Snapshotting of global state",
+            "homepage": "http://www.github.com/sebastianbergmann/global-state",
+            "keywords": [
+                "global state"
+            ],
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/global-state/issues",
+                "source": "https://github.com/sebastianbergmann/global-state/tree/3.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-08-02T09:23:32+00:00"
+        },
+        {
+            "name": "sebastian/object-enumerator",
+            "version": "3.0.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-enumerator.git",
+                "reference": "e67f6d32ebd0c749cf9d1dbd9f226c727043cdf2"
+            },
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+                "reference": "e67f6d32ebd0c749cf9d1dbd9f226c727043cdf2",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0",
+                "sebastian/object-reflector": "^1.1.1",
+                "sebastian/recursion-context": "^3.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Traverses array structures and object graphs to enumerate all referenced objects",
+            "homepage": "https://github.com/sebastianbergmann/object-enumerator/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-enumerator/issues",
+                "source": "https://github.com/sebastianbergmann/object-enumerator/tree/3.0.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:40:27+00:00"
+        },
+        {
+            "name": "sebastian/object-reflector",
+            "version": "1.1.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/object-reflector.git",
+                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d"
+            },
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+                "reference": "9b8772b9cbd456ab45d4a598d2dd1a1bced6363d",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Allows reflection of object attributes, including inherited and non-public ones",
+            "homepage": "https://github.com/sebastianbergmann/object-reflector/",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/object-reflector/issues",
+                "source": "https://github.com/sebastianbergmann/object-reflector/tree/1.1.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:37:18+00:00"
+        },
+        {
+            "name": "sebastian/recursion-context",
+            "version": "3.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/recursion-context.git",
+                "reference": "367dcba38d6e1977be014dc4b22f47a484dac7fb"
+            },
+            "dist": {
+                "type": "zip",
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+                "reference": "367dcba38d6e1977be014dc4b22f47a484dac7fb",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                },
+                {
+                    "name": "Jeff Welch",
+                    "email": "whatthejeff@gmail.com"
+                },
+                {
+                    "name": "Adam Harvey",
+                    "email": "aharvey@php.net"
+                }
+            ],
+            "description": "Provides functionality to recursively process PHP variables",
+            "homepage": "http://www.github.com/sebastianbergmann/recursion-context",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/recursion-context/issues",
+                "source": "https://github.com/sebastianbergmann/recursion-context/tree/3.0.1"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:34:24+00:00"
+        },
+        {
+            "name": "sebastian/resource-operations",
+            "version": "2.0.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/resource-operations.git",
+                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3"
+            },
+            "dist": {
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+                "reference": "31d35ca87926450c44eae7e2611d45a7a65ea8b3",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.1"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de"
+                }
+            ],
+            "description": "Provides a list of PHP built-in functions that operate on resources",
+            "homepage": "https://www.github.com/sebastianbergmann/resource-operations",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/resource-operations/issues",
+                "source": "https://github.com/sebastianbergmann/resource-operations/tree/2.0.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:30:19+00:00"
+        },
+        {
+            "name": "sebastian/type",
+            "version": "1.1.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/type.git",
+                "reference": "0150cfbc4495ed2df3872fb31b26781e4e077eb4"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/type/zipball/0150cfbc4495ed2df3872fb31b26781e4e077eb4",
+                "reference": "0150cfbc4495ed2df3872fb31b26781e4e077eb4",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7.2"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^8.2"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.1-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Collection of value objects that represent the types of the PHP type system",
+            "homepage": "https://github.com/sebastianbergmann/type",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/type/issues",
+                "source": "https://github.com/sebastianbergmann/type/tree/1.1.4"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/sebastianbergmann",
+                    "type": "github"
+                }
+            ],
+            "time": "2020-11-30T07:25:11+00:00"
+        },
+        {
+            "name": "sebastian/version",
+            "version": "2.0.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/sebastianbergmann/version.git",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/sebastianbergmann/version/zipball/99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "reference": "99732be0ddb3361e16ad77b68ba41efc8e979019",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=5.6"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.0.x-dev"
+                }
+            },
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Sebastian Bergmann",
+                    "email": "sebastian@phpunit.de",
+                    "role": "lead"
+                }
+            ],
+            "description": "Library that helps with managing the version number of Git-hosted PHP projects",
+            "homepage": "https://github.com/sebastianbergmann/version",
+            "support": {
+                "issues": "https://github.com/sebastianbergmann/version/issues",
+                "source": "https://github.com/sebastianbergmann/version/tree/master"
+            },
+            "time": "2016-10-03T07:35:21+00:00"
+        },
+        {
+            "name": "squizlabs/php_codesniffer",
+            "version": "3.9.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/PHPCSStandards/PHP_CodeSniffer.git",
+                "reference": "d63cee4890a8afaf86a22e51ad4d97c91dd4579b"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/PHPCSStandards/PHP_CodeSniffer/zipball/d63cee4890a8afaf86a22e51ad4d97c91dd4579b",
+                "reference": "d63cee4890a8afaf86a22e51ad4d97c91dd4579b",
+                "shasum": ""
+            },
+            "require": {
+                "ext-simplexml": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": ">=5.4.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.0 || ^5.0 || ^6.0 || ^7.0 || ^8.0 || ^9.3.4"
+            },
+            "bin": [
+                "bin/phpcbf",
+                "bin/phpcs"
+            ],
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "3.x-dev"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Greg Sherwood",
+                    "role": "Former lead"
+                },
+                {
+                    "name": "Juliette Reinders Folmer",
+                    "role": "Current lead"
+                },
+                {
+                    "name": "Contributors",
+                    "homepage": "https://github.com/PHPCSStandards/PHP_CodeSniffer/graphs/contributors"
+                }
+            ],
+            "description": "PHP_CodeSniffer tokenizes PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.",
+            "homepage": "https://github.com/PHPCSStandards/PHP_CodeSniffer",
+            "keywords": [
+                "phpcs",
+                "standards",
+                "static analysis"
+            ],
+            "support": {
+                "issues": "https://github.com/PHPCSStandards/PHP_CodeSniffer/issues",
+                "security": "https://github.com/PHPCSStandards/PHP_CodeSniffer/security/policy",
+                "source": "https://github.com/PHPCSStandards/PHP_CodeSniffer",
+                "wiki": "https://github.com/PHPCSStandards/PHP_CodeSniffer/wiki"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/PHPCSStandards",
+                    "type": "github"
+                },
+                {
+                    "url": "https://github.com/jrfnl",
+                    "type": "github"
+                },
+                {
+                    "url": "https://opencollective.com/php_codesniffer",
+                    "type": "open_collective"
+                }
+            ],
+            "time": "2024-02-16T15:06:51+00:00"
+        },
+        {
+            "name": "theseer/tokenizer",
+            "version": "1.2.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/theseer/tokenizer.git",
+                "reference": "b2ad5003ca10d4ee50a12da31de12a5774ba6b96"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/theseer/tokenizer/zipball/b2ad5003ca10d4ee50a12da31de12a5774ba6b96",
+                "reference": "b2ad5003ca10d4ee50a12da31de12a5774ba6b96",
+                "shasum": ""
+            },
+            "require": {
+                "ext-dom": "*",
+                "ext-tokenizer": "*",
+                "ext-xmlwriter": "*",
+                "php": "^7.2 || ^8.0"
+            },
+            "type": "library",
+            "autoload": {
+                "classmap": [
+                    "src/"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "BSD-3-Clause"
+            ],
+            "authors": [
+                {
+                    "name": "Arne Blankerts",
+                    "email": "arne@blankerts.de",
+                    "role": "Developer"
+                }
+            ],
+            "description": "A small library for converting tokenized PHP source code into XML and potentially other formats",
+            "support": {
+                "issues": "https://github.com/theseer/tokenizer/issues",
+                "source": "https://github.com/theseer/tokenizer/tree/1.2.2"
+            },
+            "funding": [
+                {
+                    "url": "https://github.com/theseer",
+                    "type": "github"
+                }
+            ],
+            "time": "2023-11-20T00:12:19+00:00"
+        }
+    ],
+    "aliases": [],
+    "minimum-stability": "stable",
+    "stability-flags": [],
+    "prefer-stable": false,
+    "prefer-lowest": false,
+    "platform": {
+        "php": ">=7.2",
+        "ext-ctype": "*"
+    },
+    "platform-dev": [],
+    "platform-overrides": {
+        "php": "7.2"
+    },
+    "plugin-api-version": "2.6.0"
+}
diff --git a/phpcs.xml.dist b/phpcs.xml.dist
new file mode 100644
index 0000000..b4d3501
--- /dev/null
+++ b/phpcs.xml.dist
@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<ruleset
+    name="Custom"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="./vendor/squizlabs/php_codesniffer/phpcs.xsd">
+
+    <file>./src/</file>
+    <file>./tests/src/</file>
+
+    <rule ref="PSR2"/>
+</ruleset>
diff --git a/phpunit.xml b/phpunit.xml
deleted file mode 100644
index 5a88db9..0000000
--- a/phpunit.xml
+++ /dev/null
@@ -1,14 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<phpunit bootstrap="vendor/autoload.php" colors="true">
-    <testsuites>
-        <testsuite name="Tests">
-            <directory>./tests/</directory>
-        </testsuite>
-    </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>./src/</directory>
-        </whitelist>
-    </filter>
-</phpunit>
\ No newline at end of file
diff --git a/phpunit.xml.dist b/phpunit.xml.dist
new file mode 100644
index 0000000..b6bd97a
--- /dev/null
+++ b/phpunit.xml.dist
@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:noNamespaceSchemaLocation="./vendor/phpunit/phpunit/phpunit.xsd"
+    bootstrap="vendor/autoload.php"
+    cacheResultFile=".cache/phpunit/results.json"
+    executionOrder="depends,defects"
+    forceCoversAnnotation="true"
+    beStrictAboutOutputDuringTests="true"
+    defaultTestSuite="Unit"
+    verbose="true"
+    colors="true">
+
+    <testsuites>
+        <testsuite name="Unit">
+            <directory>tests/src/Unit/</directory>
+        </testsuite>
+    </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory>./src/</directory>
+        </whitelist>
+    </filter>
+
+    <logging>
+        <log type="coverage-text"   target="php://stdout"/>
+        <log type="coverage-html"   target="reports/human/html/"/>
+        <log type="testdox-html"    target="reports/human/result.html"/>
+        <log type="coverage-clover" target="reports/machine/coverage.clover.xml"/>
+        <log type="coverage-php"    target="reports/machine/coverage.php"/>
+        <log type="junit"           target="reports/machine/result.junit.xml"/>
+    </logging>
+</phpunit>
diff --git a/src/Package.php b/src/Package.php
index dd28001..d5089fd 100644
--- a/src/Package.php
+++ b/src/Package.php
@@ -59,7 +59,7 @@ class Package
      *
      * @var Package[]
      */
-    protected $resolves;
+    protected $resolves = [];
 
     /**
      * Depth in the dependency tree. Only initialized once the YarnLock computes
@@ -265,4 +265,4 @@ public function __toString()
     {
         return $this->getName() . '@' . $this->getVersion();
     }
-}
\ No newline at end of file
+}
diff --git a/src/Parser.php b/src/Parser.php
index c6bd6de..43294c2 100644
--- a/src/Parser.php
+++ b/src/Parser.php
@@ -50,10 +50,17 @@ public function parse($input, $assoc = false)
                             $indentationDepth = $i;
                         } else {
                             if ($i % $indentationDepth !== 0) {
-                                throw new ParserException(sprintf('Indentation depth is not constant at line %s', $l), 1519140379);
+                                throw new ParserException(
+                                    sprintf('Indentation depth is not constant at line %s', $l),
+                                    1519140379
+                                );
                             }
+
                             if ($i / $indentationDepth > $indentationLevel) {
-                                throw new ParserException(sprintf('Unexpected indentation at line %s', $l), 1519140493);
+                                throw new ParserException(
+                                    sprintf('Unexpected indentation at line %s', $l),
+                                    1519140493
+                                );
                             }
                         }
                         $newIndentationLevel = $i / $indentationDepth;
@@ -165,7 +172,9 @@ protected static function convertObjectToArray($object)
      * If parts of keys contain spaces, they are surrounded with quotes,
      * e.g. `minimatch@^3.0.0, minimatch@^3.0.2, "minimatch@2 || 3"`, which would
      * fail when simply splitting on spaces.
+     *
      * @param string $key
+     *
      * @return string[]
      */
     public static function parseVersionStrings($key)
@@ -197,8 +206,13 @@ public static function parseVersionStrings($key)
                 $result[] = $currentKey;
             }
         }
-        $result = array_map(function($e) { return trim($e); }, $result);
-        return $result;
+
+        return array_map(
+            function ($e) {
+                return trim($e);
+            },
+            $result
+        );
     }
 
     /**
@@ -206,6 +220,7 @@ public static function parseVersionStrings($key)
      * package name.
      *
      * @param string $versionString
+     *
      * @return string[]
      */
     public static function splitVersionString($versionString)
@@ -217,4 +232,4 @@ public static function splitVersionString($versionString)
              $version
          ];
     }
-}
\ No newline at end of file
+}
diff --git a/src/YarnLock.php b/src/YarnLock.php
index 25ca7e5..2ee0be0 100644
--- a/src/YarnLock.php
+++ b/src/YarnLock.php
@@ -1,6 +1,6 @@
 <?php
-namespace Mindscreen\YarnLock;
 
+namespace Mindscreen\YarnLock;
 
 class YarnLock
 {
@@ -42,6 +42,7 @@ protected static function evaluatePackages($data)
     {
         $packageVersionMap = [];
         $allPackages = [];
+        $handledPackages = [];
         foreach (get_object_vars($data) as $packageVersions => $dependencyInformation) {
             $packageVersionStrings = Parser::parseVersionStrings($packageVersions);
             $packageName = Parser::splitVersionString($packageVersionStrings[0])[0];
@@ -64,14 +65,14 @@ protected static function evaluatePackages($data)
             $allPackages[] = $package;
         }
 
-        foreach ($packageVersionMap as $packageName => $versions) {
-            foreach ($versions as $version => $packageInformation) {
+        foreach ($packageVersionMap as $versions) {
+            foreach ($versions as $packageInformation) {
                 /** @var Package $package */
                 $package = $packageInformation['package'];
-                if (isset($package->__handled)) {
+                if (!empty($handledPackages[spl_object_id($package)])) {
                     continue;
                 }
-                $package->__handled = true;
+                $handledPackages[spl_object_id($package)] = true;
                 $data = $packageInformation['data'];
                 foreach ([
                     Package::DEPENDENCY_TYPE_DEFAULT,
@@ -94,6 +95,7 @@ protected static function evaluatePackages($data)
 
     /**
      * Get all packages resolved in this lock file
+     *
      * @return Package[]
      */
     public function getPackages()
@@ -113,13 +115,19 @@ public function setPackages($packages)
      * A package might be required in multiple versions.
      *
      * @param string $packageName
+     *
      * @return Package[]
      */
     public function getPackagesByName($packageName)
     {
-        return array_values(array_filter($this->packages, function(Package $package) use ($packageName) {
-            return $package->getName() === $packageName;
-        }));
+        return array_values(
+            array_filter(
+                $this->packages,
+                function (Package $package) use ($packageName) {
+                    return $package->getName() === $packageName;
+                }
+            )
+        );
     }
 
     /**
@@ -129,21 +137,31 @@ public function getPackagesByName($packageName)
      *
      * @param int $start
      * @param int $end
+     *
      * @return Package[]
      */
     public function getPackagesByDepth($start, $end = 0)
     {
+        $this->calculateDepth();
         if ($end === 0 || ($end !== null && $end < $start)) {
             $end = $start + 1;
         }
-        return array_values(array_filter($this->packages, function(Package $package) use ($start, $end) {
-            $depth = $package->getDepth();
-            if ($depth === null) {
-                return $end === null;
-            }
-            $to = $end === null ? true : $depth < $end;
-            return $depth >= $start && $to;
-        }));
+
+        return array_values(
+            array_filter(
+                $this->packages,
+                function (Package $package) use ($start, $end) {
+                    $depth = $package->getDepth();
+                    if ($depth === null) {
+                        return $end === null;
+                    }
+
+                    $to = $end === null || ($depth < $end);
+
+                    return $depth >= $start && $to;
+                }
+            )
+        );
     }
 
     /**
@@ -154,9 +172,14 @@ public function getPackagesByDepth($start, $end = 0)
     public function getDepth()
     {
         $this->calculateDepth();
-        return array_reduce($this->packages, function($d, Package $package) {
-            return max($d, $package->getDepth());
-        }, 0) + 1;
+
+        return 1 + array_reduce(
+            $this->packages,
+            function ($d, Package $package) {
+                return max($d, $package->getDepth());
+            },
+            0
+        );
     }
 
     /**
@@ -168,6 +191,7 @@ public function getDepth()
      *
      * @param string $name
      * @param string $version
+     *
      * @return Package|null
      */
     public function getPackage($name, $version = null)
@@ -195,6 +219,7 @@ public function getPackage($name, $version = null)
      *
      * @param string $name
      * @param string $version
+     *
      * @return bool
      */
     public function hasPackage($name, $version = null)
@@ -215,9 +240,14 @@ public function calculateDepth(array $root = null)
             return;
         }
         if ($root === null) {
-            $root = array_values(array_filter($this->packages, function(Package $p) {
-                return count($p->getResolves()) === 0;
-            }));
+            $root = array_values(
+                array_filter(
+                    $this->packages,
+                    function (Package $p) {
+                        return count($p->getResolves()) === 0;
+                    }
+                )
+            );
         }
         /** @var Package $rootNode */
         foreach ($root as $rootNode) {
@@ -230,7 +260,8 @@ public function calculateDepth(array $root = null)
      * @param Package $node
      * @param int $depth
      */
-    protected function calculateChildDepth(Package $node, $depth) {
+    protected function calculateChildDepth(Package $node, $depth)
+    {
         if ($node->getDepth() !== null && $node->getDepth() <= $depth) {
             return;
         }
@@ -239,4 +270,4 @@ protected function calculateChildDepth(Package $node, $depth) {
             $this->calculateChildDepth($dependency, $depth + 1);
         }
     }
-}
\ No newline at end of file
+}
diff --git a/tests/parserinput/comments b/tests/fixtures/comments.txt
similarity index 100%
rename from tests/parserinput/comments
rename to tests/fixtures/comments.txt
diff --git a/tests/parserinput/datatypes b/tests/fixtures/datatypes.txt
similarity index 100%
rename from tests/parserinput/datatypes
rename to tests/fixtures/datatypes.txt
diff --git a/tests/parserinput/deep b/tests/fixtures/deep.txt
similarity index 100%
rename from tests/parserinput/deep
rename to tests/fixtures/deep.txt
diff --git a/tests/parserinput/example-yarn-package.lock b/tests/fixtures/example-yarn-package.txt
similarity index 100%
rename from tests/parserinput/example-yarn-package.lock
rename to tests/fixtures/example-yarn-package.txt
diff --git a/tests/parserinput/indentation_depth b/tests/fixtures/indentation_depth.txt
similarity index 100%
rename from tests/parserinput/indentation_depth
rename to tests/fixtures/indentation_depth.txt
diff --git a/tests/parserinput/missing_property b/tests/fixtures/missing_property.txt
similarity index 100%
rename from tests/parserinput/missing_property
rename to tests/fixtures/missing_property.txt
diff --git a/tests/parserinput/missing_property2 b/tests/fixtures/missing_property2.txt
similarity index 100%
rename from tests/parserinput/missing_property2
rename to tests/fixtures/missing_property2.txt
diff --git a/tests/parserinput/missing_property_eof b/tests/fixtures/missing_property_eof.txt
similarity index 100%
rename from tests/parserinput/missing_property_eof
rename to tests/fixtures/missing_property_eof.txt
diff --git a/tests/parserinput/mixed_indentation b/tests/fixtures/mixed_indentation.txt
similarity index 100%
rename from tests/parserinput/mixed_indentation
rename to tests/fixtures/mixed_indentation.txt
diff --git a/tests/parserinput/mixed_indentation_depth b/tests/fixtures/mixed_indentation_depth.txt
similarity index 100%
rename from tests/parserinput/mixed_indentation_depth
rename to tests/fixtures/mixed_indentation_depth.txt
diff --git a/tests/parserinput/quoted-key b/tests/fixtures/quoted-key.txt
similarity index 100%
rename from tests/parserinput/quoted-key
rename to tests/fixtures/quoted-key.txt
diff --git a/tests/parserinput/unexpected_indentation b/tests/fixtures/unexpected_indentation.txt
similarity index 100%
rename from tests/parserinput/unexpected_indentation
rename to tests/fixtures/unexpected_indentation.txt
diff --git a/tests/parserinput/valid_input b/tests/fixtures/valid_input.txt
similarity index 100%
rename from tests/parserinput/valid_input
rename to tests/fixtures/valid_input.txt
diff --git a/tests/PackageTest.php b/tests/src/Unit/PackageTest.php
similarity index 57%
rename from tests/PackageTest.php
rename to tests/src/Unit/PackageTest.php
index 2c7f5c5..85baf93 100644
--- a/tests/PackageTest.php
+++ b/tests/src/Unit/PackageTest.php
@@ -1,10 +1,16 @@
 <?php
+
+namespace Mindscreen\YarnLock\Tests\Unit;
+
 use Mindscreen\YarnLock\Package;
-use PHPUnit\Framework\TestCase;
 
-class PackageTest extends TestCase
+/**
+ * @covers \Mindscreen\YarnLock\Package
+ */
+class PackageTest extends TestBase
 {
-    public function testAvoidDuplicates() {
+    public function testAvoidDuplicates()
+    {
         $package1 = new Package();
         $package1->setName('package1');
         $package1->setVersion('1.0.1');
@@ -17,7 +23,7 @@ public function testAvoidDuplicates() {
         $package1->addDependency($package2);
         $package2->addResolves($package1);
 
-        $this->assertEquals(1, count($package1->getDependencies()));
-        $this->assertEquals(1, count($package2->getResolves()));
+        static::assertSame(1, count($package1->getDependencies()));
+        static::assertSame(1, count($package2->getResolves()));
     }
 }
diff --git a/tests/ParserTest.php b/tests/src/Unit/ParserTest.php
similarity index 60%
rename from tests/ParserTest.php
rename to tests/src/Unit/ParserTest.php
index 1bd7a50..b857699 100644
--- a/tests/ParserTest.php
+++ b/tests/src/Unit/ParserTest.php
@@ -1,10 +1,14 @@
 <?php
 
+namespace Mindscreen\YarnLock\Tests\Unit;
+
 use Mindscreen\YarnLock\Parser;
 use Mindscreen\YarnLock\ParserException;
-use PHPUnit\Framework\TestCase;
 
-class ParserTest extends TestCase
+/**
+ * @covers \Mindscreen\YarnLock\Parser
+ */
+class ParserTest extends TestBase
 {
 
     /**
@@ -12,18 +16,20 @@ class ParserTest extends TestCase
      */
     protected $parser;
 
-    protected function setUp()
+    protected function setUp(): void
     {
+        parent::setUp();
         $this->parser = new Parser();
     }
 
     /**
-     * Not using valid input should throw an exception
+     * Not using valid input should throw an exception.
+     *
      * @throws ParserException
      */
     public function testNullInput()
     {
-        $this->expectException(InvalidArgumentException::class);
+        $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionCode(1519142104);
         $this->parser->parse(null);
     }
@@ -34,16 +40,19 @@ public function testNullInput()
      */
     public function testComments()
     {
-        $fileContents = file_get_contents('tests/parserinput/comments');
+        $fileContents = static::getInput('comments.txt');
         $result = $this->parser->parse($fileContents, true);
-        $this->assertEquals([
-            'foo' => 4,
-            'bar' => [
-                'foo' => false,
-                'baz' => null,
+        static::assertSame(
+            [
+                'foo' => 4,
+                'bar' => [
+                    'foo' => false,
+                    'baz' => null,
+                ],
+                'baz' => true,
             ],
-            'baz' => true,
-        ], $result);
+            $result
+        );
     }
 
     /**
@@ -54,7 +63,7 @@ public function testMixedIndentations()
     {
         $this->expectException(ParserException::class);
         $this->expectExceptionCode(1519140104);
-        $fileContents = file_get_contents('tests/parserinput/mixed_indentation');
+        $fileContents = static::getInput('mixed_indentation.txt');
         $this->parser->parse($fileContents, true);
     }
 
@@ -66,7 +75,7 @@ public function testMixedIndentationDepth()
     {
         $this->expectException(ParserException::class);
         $this->expectExceptionCode(1519140379);
-        $fileContents = file_get_contents('tests/parserinput/mixed_indentation_depth');
+        $fileContents = static::getInput('mixed_indentation_depth.txt');
         $this->parser->parse($fileContents, true);
     }
 
@@ -76,16 +85,19 @@ public function testMixedIndentationDepth()
      */
     public function testDifferentIndentationDepth()
     {
-        $fileContents = file_get_contents('tests/parserinput/indentation_depth');
+        $fileContents = static::getInput('indentation_depth.txt');
         $result = $this->parser->parse($fileContents, true);
-        $this->assertEquals([
-            'foo' => [
-                'bar' => 'bar',
-                'baz' => [
-                    'foobar' => true
-                ]
-            ]
-        ], $result);
+        static::assertSame(
+            [
+                'foo' => [
+                    'bar' => 'bar',
+                    'baz' => [
+                        'foobar' => true,
+                    ],
+                ],
+            ],
+            $result
+        );
     }
 
     /**
@@ -96,7 +108,7 @@ public function testUnexpectedIndentation()
     {
         $this->expectException(ParserException::class);
         $this->expectExceptionCode(1519140493);
-        $fileContents = file_get_contents('tests/parserinput/unexpected_indentation');
+        $fileContents = static::getInput('unexpected_indentation.txt');
         $this->parser->parse($fileContents, true);
     }
 
@@ -108,7 +120,7 @@ public function testMissingProperty()
     {
         $this->expectException(ParserException::class);
         $this->expectExceptionCode(1519142311);
-        $fileContents = file_get_contents('tests/parserinput/missing_property');
+        $fileContents = static::getInput('missing_property.txt');
         $this->parser->parse($fileContents, true);
     }
 
@@ -120,7 +132,7 @@ public function testMissingProperty2()
     {
         $this->expectException(ParserException::class);
         $this->expectExceptionCode(1519142311);
-        $fileContents = file_get_contents('tests/parserinput/missing_property2');
+        $fileContents = static::getInput('missing_property2.txt');
         $this->parser->parse($fileContents, true);
     }
 
@@ -132,7 +144,7 @@ public function testMissingPropertyEof()
     {
         $this->expectException(ParserException::class);
         $this->expectExceptionCode(1519142311);
-        $fileContents = file_get_contents('tests/parserinput/missing_property_eof');
+        $fileContents = static::getInput('missing_property_eof.txt');
         $this->parser->parse($fileContents, true);
     }
 
@@ -153,16 +165,16 @@ public function testMissingPropertyValue()
      */
     public function testDataTypes()
     {
-        $fileContents = file_get_contents('tests/parserinput/datatypes');
+        $fileContents = static::getInput('datatypes.txt');
         $result = $this->parser->parse($fileContents);
-        $this->assertSame(true, $result->bool_t);
-        $this->assertSame(false, $result->bool_f);
-        $this->assertSame(null, $result->unset);
-        $this->assertSame(42, $result->int);
-        $this->assertSame(13.37, $result->float);
-        $this->assertSame('true', $result->string_t);
-        $this->assertSame('string string', $result->string);
-        $this->assertSame('12.13.14', $result->other);
+        static::assertSame(true, $result->bool_t);
+        static::assertSame(false, $result->bool_f);
+        static::assertSame(null, $result->unset);
+        static::assertSame(42, $result->int);
+        static::assertSame(13.37, $result->float);
+        static::assertSame('true', $result->string_t);
+        static::assertSame('string string', $result->string);
+        static::assertSame('12.13.14', $result->other);
     }
 
     /**
@@ -171,18 +183,18 @@ public function testDataTypes()
      */
     public function testYarnExampleObject()
     {
-        $fileContents = file_get_contents('tests/parserinput/valid_input');
+        $fileContents = static::getInput('valid_input.txt');
         $result = $this->parser->parse($fileContents);
-        $this->assertEquals(true, $result instanceof \stdClass);
-        $this->assertEquals(4, count(get_object_vars($result)));
-        $this->assertObjectHasAttribute('package-1@^1.0.0', $result);
+        static::assertSame(true, $result instanceof \stdClass);
+        static::assertSame(4, count(get_object_vars($result)));
+        static::assertObjectHasAttribute('package-1@^1.0.0', $result);
         $key = 'package-3@^3.0.0';
         $package3 = $result->$key;
-        $this->assertObjectHasAttribute('version', $package3);
-        $this->assertObjectHasAttribute('resolved', $package3);
-        $this->assertObjectHasAttribute('dependencies', $package3);
+        static::assertObjectHasAttribute('version', $package3);
+        static::assertObjectHasAttribute('resolved', $package3);
+        static::assertObjectHasAttribute('dependencies', $package3);
         $package3_dependencies = $package3->dependencies;
-        $this->assertEquals(1, count(get_object_vars($package3_dependencies)));
+        static::assertSame(1, count(get_object_vars($package3_dependencies)));
     }
 
     /**
@@ -191,18 +203,18 @@ public function testYarnExampleObject()
      */
     public function testYarnExampleArray()
     {
-        $fileContents = file_get_contents('tests/parserinput/valid_input');
+        $fileContents = static::getInput('valid_input.txt');
         $result = $this->parser->parse($fileContents, true);
-        $this->assertEquals(true, is_array($result));
-        $this->assertEquals(4, count($result));
-        $this->assertArrayHasKey('package-1@^1.0.0', $result);
+        static::assertSame(true, is_array($result));
+        static::assertSame(4, count($result));
+        static::assertArrayHasKey('package-1@^1.0.0', $result);
         $package3 = $result['package-3@^3.0.0'];
-        $this->assertArrayHasKey('version', $package3);
-        $this->assertArrayHasKey('resolved', $package3);
-        $this->assertArrayHasKey('dependencies', $package3);
+        static::assertArrayHasKey('version', $package3);
+        static::assertArrayHasKey('resolved', $package3);
+        static::assertArrayHasKey('dependencies', $package3);
         $package3_dependencies = $package3['dependencies'];
-        $this->assertEquals(true, is_array($package3_dependencies));
-        $this->assertEquals(1, count($package3_dependencies));
+        static::assertSame(true, is_array($package3_dependencies));
+        static::assertSame(1, count($package3_dependencies));
     }
 
     /**
@@ -210,12 +222,12 @@ public function testYarnExampleArray()
      */
     public function testVersionSplitting()
     {
-        $this->assertEquals(
+        static::assertSame(
             ['gulp-sourcemaps', '2.6.4'],
             Parser::splitVersionString('gulp-sourcemaps@2.6.4')
         );
 
-        $this->assertEquals(
+        static::assertSame(
             ['@gulp-sourcemaps/identity-map', '1.X'],
             Parser::splitVersionString('@gulp-sourcemaps/identity-map@1.X')
         );
@@ -227,12 +239,12 @@ public function testVersionSplitting()
      */
     public function testQuotedKeys()
     {
-        $fileContents = file_get_contents('tests/parserinput/quoted-key');
+        $fileContents = static::getInput('quoted-key.txt');
         $result = $this->parser->parse($fileContents, true);
         $data = $result['test'];
         foreach (['foo', 'bar', 'foo bar', 'foobar'] as $item) {
-            $this->assertArrayHasKey($item, $data);
-            $this->assertEquals($item, $data[$item]);
+            static::assertArrayHasKey($item, $data);
+            static::assertSame($item, $data[$item]);
         }
     }
 
@@ -240,22 +252,22 @@ public function testParseVersionStrings()
     {
         $input = 'minimatch@^3.0.0, minimatch@^3.0.2, "minimatch@2 || 3"';
         $versionStrings = Parser::parseVersionStrings($input);
-        $this->assertEquals(['minimatch@^3.0.0', 'minimatch@^3.0.2', 'minimatch@2 || 3'], $versionStrings);
+        static::assertSame(['minimatch@^3.0.0', 'minimatch@^3.0.2', 'minimatch@2 || 3'], $versionStrings);
 
         $input = 'babel-types@^6.10.2, babel-types@^6.14.0, babel-types@^6.15.0';
         $versionStrings = Parser::parseVersionStrings($input);
-        $this->assertEquals(['babel-types@^6.10.2', 'babel-types@^6.14.0', 'babel-types@^6.15.0'], $versionStrings);
+        static::assertSame(['babel-types@^6.10.2', 'babel-types@^6.14.0', 'babel-types@^6.15.0'], $versionStrings);
 
         $input = 'array-uniq@^1.0.1';
         $versionStrings = Parser::parseVersionStrings($input);
-        $this->assertEquals(['array-uniq@^1.0.1'], $versionStrings);
+        static::assertSame(['array-uniq@^1.0.1'], $versionStrings);
 
         $input = '"cssom@>= 0.3.0 < 0.4.0", cssom@0.3.x';
         $versionStrings = Parser::parseVersionStrings($input);
-        $this->assertEquals(['cssom@>= 0.3.0 < 0.4.0', 'cssom@0.3.x'], $versionStrings);
+        static::assertSame(['cssom@>= 0.3.0 < 0.4.0', 'cssom@0.3.x'], $versionStrings);
 
         $input = '"graceful-readlink@>= 1.0.0"';
         $versionStrings = Parser::parseVersionStrings($input);
-        $this->assertEquals(['graceful-readlink@>= 1.0.0'], $versionStrings);
+        static::assertSame(['graceful-readlink@>= 1.0.0'], $versionStrings);
     }
 }
diff --git a/tests/src/Unit/TestBase.php b/tests/src/Unit/TestBase.php
new file mode 100644
index 0000000..36c41aa
--- /dev/null
+++ b/tests/src/Unit/TestBase.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Mindscreen\YarnLock\Tests\Unit;
+
+use PHPUnit\Framework\TestCase;
+
+class TestBase extends TestCase
+{
+
+    protected static function rootDir(): string
+    {
+        return dirname(__DIR__, 3);
+    }
+
+    /**
+     * @param string[] $parts
+     */
+    protected static function fixturesPath(array $parts): string
+    {
+        array_unshift(
+            $parts,
+            static::rootDir(),
+            'tests',
+            'fixtures'
+        );
+
+        return implode(\DIRECTORY_SEPARATOR, $parts);
+    }
+
+    protected static function getInput(string $filePath): string
+    {
+        return file_get_contents(static::fixturesPath([$filePath])) ?: '';
+    }
+}
diff --git a/tests/YarnLockTest.php b/tests/src/Unit/YarnLockTest.php
similarity index 62%
rename from tests/YarnLockTest.php
rename to tests/src/Unit/YarnLockTest.php
index 0d6fb6a..5bc7350 100644
--- a/tests/YarnLockTest.php
+++ b/tests/src/Unit/YarnLockTest.php
@@ -1,11 +1,14 @@
 <?php
 
+namespace Mindscreen\YarnLock\Tests\Unit;
+
 use Mindscreen\YarnLock\Package;
 use Mindscreen\YarnLock\YarnLock;
 
-use PHPUnit\Framework\TestCase;
-
-class YarnLockTest extends TestCase
+/**
+ * @covers \Mindscreen\YarnLock\YarnLock
+ */
+class YarnLockTest extends TestBase
 {
     /**
      * @var YarnLock
@@ -18,14 +21,14 @@ class YarnLockTest extends TestCase
      */
     public function testNullInput()
     {
-        $this->expectException(InvalidArgumentException::class);
+        $this->expectException(\InvalidArgumentException::class);
         $this->expectExceptionCode(1519201965);
         YarnLock::fromString(null);
     }
 
-    protected function setUp()
+    protected function setUp(): void
     {
-        $yarnLockContents = file_get_contents('tests/parserinput/example-yarn-package.lock');
+        $yarnLockContents = static::getInput('example-yarn-package.txt');
         $this->yarnLock = YarnLock::fromString($yarnLockContents);
     }
 
@@ -35,12 +38,12 @@ protected function setUp()
     public function testPackageExists()
     {
         // babel-core@^6.0.0, babel-core@^6.11.4, babel-core@^6.14.0:
-        $this->assertTrue($this->yarnLock->hasPackage('babel-core'));
-        $this->assertTrue($this->yarnLock->hasPackage('babel-core', '^6.0.0'));
-        $this->assertTrue($this->yarnLock->hasPackage('babel-core', '^6.11.4'));
-        $this->assertTrue($this->yarnLock->hasPackage('babel-core', '^6.14.0'));
-        $this->assertTrue($this->yarnLock->hasPackage('babel-core', '6.14.0'));
-        $this->assertFalse($this->yarnLock->hasPackage('babel-core', '6.15.0'));
+        static::assertTrue($this->yarnLock->hasPackage('babel-core'));
+        static::assertTrue($this->yarnLock->hasPackage('babel-core', '^6.0.0'));
+        static::assertTrue($this->yarnLock->hasPackage('babel-core', '^6.11.4'));
+        static::assertTrue($this->yarnLock->hasPackage('babel-core', '^6.14.0'));
+        static::assertTrue($this->yarnLock->hasPackage('babel-core', '6.14.0'));
+        static::assertFalse($this->yarnLock->hasPackage('babel-core', '6.15.0'));
     }
 
     /**
@@ -51,17 +54,17 @@ public function testGetPackage()
     {
         $packageName = 'babel-core';
         $package = $this->yarnLock->getPackage($packageName);
-        $this->assertEquals($packageName, $package->getName());
+        static::assertSame($packageName, $package->getName());
 
         $packageVersion = '6.14.0';
         $package = $this->yarnLock->getPackage($packageName, $packageVersion);
-        $this->assertEquals($packageVersion, $package->getVersion());
+        static::assertSame($packageVersion, $package->getVersion());
 
         $package = $this->yarnLock->getPackage($packageName, '^6.11.4');
-        $this->assertEquals($packageVersion, $package->getVersion());
+        static::assertSame($packageVersion, $package->getVersion());
 
         $package = $this->yarnLock->getPackage('foo');
-        $this->assertNull($package);
+        static::assertNull($package);
     }
 
     /**
@@ -69,7 +72,7 @@ public function testGetPackage()
      */
     public function testDepth()
     {
-        $this->assertEquals(10, $this->yarnLock->getDepth());
+        static::assertSame(10, $this->yarnLock->getDepth());
     }
 
     /**
@@ -79,7 +82,14 @@ public function testDepth()
      */
     protected function getPackageStrings(array $packages)
     {
-        return array_values(array_map(function(Package $p) { return $p->__toString(); }, $packages));
+        return array_values(
+            array_map(
+                function (Package $p) {
+                    return $p->__toString();
+                },
+                $packages
+            )
+        );
     }
 
     /**
@@ -93,20 +103,19 @@ public function testGetPackagesByDepth()
         ];
         $this->yarnLock->calculateDepth($rootPackages);
         $depth0 = $this->yarnLock->getPackagesByDepth(0);
-        $this->assertEquals(count($rootPackages), count($depth0));
+        static::assertSame(count($rootPackages), count($depth0));
 
         $depth1 = $this->yarnLock->getPackagesByDepth(1);
         $depth2 = $this->yarnLock->getPackagesByDepth(2);
         $depth12 = $this->yarnLock->getPackagesByDepth(1, 3);
-        $this->assertEquals(count($depth1) + count($depth2), count($depth12));
+        static::assertSame(count($depth1) + count($depth2), count($depth12));
 
         // should not be calculated again
         $this->yarnLock->calculateDepth();
         $depthStart = $this->yarnLock->getPackagesByDepth(0, 2);
         $depthRest = $this->yarnLock->getPackagesByDepth(2, null);
-        var_dump(count($depthRest));
         $allPackages = $this->yarnLock->getPackages();
-        $this->assertEquals(count($allPackages), count($depthStart) + count($depthRest));
+        static::assertSame(count($allPackages), count($depthStart) + count($depthRest));
     }
 
     /**
@@ -115,16 +124,21 @@ public function testGetPackagesByDepth()
     public function testGetPackagesByName()
     {
         $packages = $this->yarnLock->getPackagesByName('source-map');
-        $this->assertEquals(4, count($packages));
+        static::assertSame(4, count($packages));
         $expectedVersions = [
             ['^0.4.4'],
             ['^0.5.0', '^0.5.3', '~0.5.1'],
             ['~0.2.0'],
             ['0.1.32'],
         ];
-        $versions = array_map(function(Package $p) { return $p->getSatisfiedVersions(); }, $packages);
+        $versions = array_map(
+            function (Package $p) {
+                return $p->getSatisfiedVersions();
+            },
+            $packages
+        );
         $versions = array_values($versions);
-        $this->assertEquals($expectedVersions, $versions);
+        static::assertSame($expectedVersions, $versions);
     }
 
     /**
@@ -133,7 +147,7 @@ public function testGetPackagesByName()
     public function testPackageString()
     {
         foreach ($this->yarnLock->getPackages() as $package) {
-            $this->assertEquals($package->getName() . '@' . $package->getVersion(), $package->__toString());
+            static::assertSame($package->getName() . '@' . $package->getVersion(), $package->__toString());
         }
     }
 
@@ -143,14 +157,14 @@ public function testPackageString()
     public function testResolvedSet()
     {
         foreach ($this->yarnLock->getPackages() as $package) {
-            $this->assertNotEmpty($package->getResolved());
+            static::assertNotEmpty($package->getResolved());
         }
     }
 
     public function testYarnExample()
     {
-        $yarnLockContents = file_get_contents('tests/parserinput/deep');
+        $yarnLockContents = static::getInput('deep.txt');
         $yarnLock = YarnLock::fromString($yarnLockContents);
-        $this->assertEquals(4, count($yarnLock->getPackages()));
+        static::assertSame(4, count($yarnLock->getPackages()));
     }
 }