diff --git a/.travis.build.sh b/.travis.build.sh
index 242be26f..ae53f970 100755
--- a/.travis.build.sh
+++ b/.travis.build.sh
@@ -61,7 +61,7 @@ if [ "$TEST_SUITE" = "syntax" ] || [ "$TEST_SUITE" = "style" ]; then
 fi
 
 # Build tests require the corresponding version of Open XDMoD.
-if [ "$TEST_SUITE" = "build" ]; then
+if [ "$TEST_SUITE" = "build" ] || [ "$TEST_SUITE" = "unit" ]; then
     # If present, move Travis cache dirs out of the way.
     xdmod_cache_exists="false"; [ -e ../xdmod ] && xdmod_cache_exists="true"
     if "$xdmod_cache_exists"; then
@@ -77,26 +77,9 @@ if [ "$TEST_SUITE" = "build" ]; then
         mv ../xdmod-cache/etl/js/node_modules ../xdmod/etl/js/node_modules
     fi
 
-    # If PHP 5.3.3 is installed, SSL/TLS isn't available to PHP.
-    # Use a newer version of PHP for installing Composer dependencies.
-    using_php_533="false"; [[ "$(php --version)" == PHP\ 5.3.3\ * ]] && using_php_533="true"
-    if "$using_php_533"; then
-        echo "Using newer version of PHP for installing dependencies"
-        phpenv global 5.3
-        php --version
-    fi
-
-    # Install Composer dependencies.
-    pushd ../xdmod >/dev/null
-    composer install
-    popd >/dev/null
-
-    # If using PHP 5.3.3 for testing purposes, stop using the newer PHP version.
-    if "$using_php_533"; then
-        echo "Reverting back to PHP 5.3.3 for testing"
-        phpenv global 5.3.3
-        php --version
-    fi
+    pushd ../xdmod
+    . .travis.install.sh
+    popd
 
     # Create a symlink from Open XDMoD to this module.
     ln -s "$(pwd)" "../xdmod/open_xdmod/modules/$module_dir"
@@ -156,6 +139,11 @@ elif [ "$TEST_SUITE" = "style" ]; then
             build_exit_value=2
         fi
     done
+elif [ "$TEST_SUITE" = "unit" ]; then
+    tests/runtests.sh
+    if [ $? != 0 ]; then
+        build_exit_value=2
+    fi
 elif [ "$TEST_SUITE" = "build" ]; then
     # If PHP 5.3.3 is installed, SSL/TLS isn't available to PHP.
     # Use a newer version of PHP for installing Composer dependencies.
diff --git a/.travis.yml b/.travis.yml
index 70380c06..24d6487c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,6 +12,7 @@ env:
     matrix:
         - TEST_SUITE=syntax
         - TEST_SUITE=style
+        - TEST_SUITE=unit
         - TEST_SUITE=build CACHE_NAME=build
 
 # Add dependency directories to the Travis cache
diff --git a/tests/README.md b/tests/README.md
new file mode 100644
index 00000000..df183c74
--- /dev/null
+++ b/tests/README.md
@@ -0,0 +1,7 @@
+Open XDMoD SUPReMM module Unit Tests
+=====================
+
+Run the tests:
+
+    $ ./runtests.sh
+
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
new file mode 100644
index 00000000..3231bf90
--- /dev/null
+++ b/tests/bootstrap.php
@@ -0,0 +1,41 @@
+<?php
+
+$dir = __DIR__;
+
+// Autoloader for test classes.
+spl_autoload_register(
+    function ($className) use ($dir) {
+        $classPath
+            = $dir
+            . '/lib/'
+            . str_replace('_', '/', $className)
+            . '.php';
+
+        if (is_readable($classPath)) {
+            return require_once $classPath;
+        } else {
+            return false;
+        }
+    }
+);
+
+// Autoloader for SUPReMM module classes
+spl_autoload_register(
+    function ($className) use ($dir) {
+        $classPath
+            = $dir
+            . '/../classes/'
+            . str_replace('\\', '/', $className)
+            . '.php';
+
+        error_log("Checking ".$classPath);
+        if (is_readable($classPath)) {
+            return require_once $classPath;
+        } else {
+            return false;
+        }
+    }
+);
+
+// Autoloader for XDMoD classes.
+require_once __DIR__ . '/../../xdmod/configuration/linker.php';
diff --git a/tests/phpunit.xml.dist b/tests/phpunit.xml.dist
new file mode 100644
index 00000000..578d81b6
--- /dev/null
+++ b/tests/phpunit.xml.dist
@@ -0,0 +1,21 @@
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/4.5/phpunit.xsd"
+         backupGlobals="true"
+         backupStaticAttributes="false"
+         bootstrap="bootstrap.php"
+         cacheTokens="true"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         forceCoversAnnotation="false"
+         mapTestClassNameToCoveredClassName="false"
+         printerClass="PHPUnit_TextUI_ResultPrinter"
+         processIsolation="false"
+         stopOnError="false"
+         stopOnFailure="false"
+         stopOnIncomplete="false"
+         stopOnSkipped="false"
+         testSuiteLoaderClass="PHPUnit_Runner_StandardTestSuiteLoader"
+         verbose="true">
+</phpunit>
diff --git a/tests/runtests.sh b/tests/runtests.sh
new file mode 100755
index 00000000..4307564d
--- /dev/null
+++ b/tests/runtests.sh
@@ -0,0 +1,10 @@
+#!/bin/sh
+
+if { ! which phpunit >/dev/null 2>&1; } then
+    echo phpunit not found 1>&2
+    exit 127
+fi
+
+cd $(dirname $0)
+phpunit .
+exit $?