Launch phpunit in CI

.github/workflows/ci.yml

@@ -0,0 +1,18 @@
+name: CI
+
+on: [push]
+
+jobs:
+  build-test:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: php-actions/composer@v6
+    - name: PHPUnit Tests for php7.4
+      uses: php-actions/phpunit@v3
+      with:
+        configuration: tests/phpunit.xml
+        version: 5.7.25
+        php_version: 7.4
+        args: --coverage-text

tests/phpunit.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0"?>
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" colors="true" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd">
+        <testsuites>
+                <testsuite name="main">
+                        <directory suffix="Test.php">.</directory>
+                </testsuite>
+        </testsuites>
+        <logging/>
+</phpunit>