Feature 788 unittests

.travis.yml

@@ -1,14 +1,15 @@
 matrix:
   include:
-    # FIXME: skipped for now since we use a different php version on the live server
-    # - language: php
-    #   php: 7.0
-    #   cache:
-    #     directories: src/vendor
-    #   before_script:
-    #     - composer install --dev --prefer-dist
-    #   script:
-    #     - sh bin/build.sh
+    - language: php
+      php:
+        - 7.1
+      cache:
+        directories: src/vendor
+      before_script:
+        - composer install --dev --prefer-dist
+      script:
+        - sh bin/build.sh
+        - ./src/vendor/bin/phpunit
     - language: node_js
       node_js: 10
       cache: yarn

CHANGELOG.md

@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
+## [Unreleased]
+
+### Added
+
+- Add unit tests based on PHPUnit ([#824](https://github.com/serlo-org/athene2/pull/824))
+  - Add yarn script `unit` that executes `./src/vendor/bin/phpunit`
+
 ## [Build 5] - 2018-12-01
 
 ### Added

README.md

@@ -201,6 +201,7 @@ Open _package.json_ and make sure the values you got from running the two comman
 Most of these are outdated:
 
 - [Knowledge base](https://github.com/serlo-org/athene2/wiki/Knowledge-base)
+- [Testing](https://github.com/serlo-org/athene2/wiki/Testing)
 - [Development workflow (outdated)](https://github.com/serlo-org/athene2/wiki/Development-workflow)
 - [Installation (totally outdated, do not look at this)](https://github.com/serlo-org/athene2/wiki/Installation)
 - [Athene2 Guide (somewhat outdated)](https://serlo-org.github.io/athene2-guide/)

composer.json

@@ -33,5 +33,8 @@
   },
   "config": {
     "vendor-dir": "src/vendor"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "^5"
   }
 }