actions: Run PHP unit tests

.github/workflows/php.yml

@@ -40,3 +40,42 @@ jobs:
       - name: PHP CodeSniffer
         if: success() || matrix.allow_failure
         run: phpcs -wps --colors
+
+  test:
+    name: Unit tests with php ${{ matrix.php }} on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    env:
+      phpunit-version: 8.5
+
+    strategy:
+      fail-fast: false
+      matrix:
+        php: ['7.2', '7.3', '7.4', '8.0', '8.1', '8.2']
+        os: ['ubuntu-latest']
+
+    steps:
+      - name: Checkout code base
+        uses: actions/checkout@v3
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          tools: phpunit:${{ matrix.phpunit-version || env.phpunit-version }}
+
+      - name: Setup Icinga Web
+        run: |
+          git clone --depth 1 https://github.com/Icinga/icingaweb2.git _icingaweb2
+          ln -s `pwd` _icingaweb2/modules/icingadb
+
+      - name: Setup Libraries
+        run: |
+          mkdir _libraries
+          git clone --depth 1 -b snapshot/nightly https://github.com/Icinga/icinga-php-library.git _libraries/ipl
+          git clone --depth 1 -b snapshot/nightly https://github.com/Icinga/icinga-php-thirdparty.git _libraries/vendor
+
+      - name: PHPUnit
+        env:
+          ICINGAWEB_LIBDIR: _libraries
+        run: phpunit --verbose --bootstrap _icingaweb2/test/php/bootstrap.php

phpunit.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit backupGlobals="false"
+         backupStaticAttributes="false"
+         colors="true"
+         convertErrorsToExceptions="true"
+         convertNoticesToExceptions="true"
+         convertWarningsToExceptions="true"
+         processIsolation="false"
+         stopOnFailure="false"
+    >
+    <testsuites>
+        <testsuite name="Icinga DB Web PHP Unit Tests">
+            <directory suffix="Test.php">test/php</directory>
+        </testsuite>
+    </testsuites>
+</phpunit>