[TASK] Add github action for testing

This also includes issue templates for bug reports and feature requests.

.github/ISSUE_TEMPLATE/bug-report.md

@@ -0,0 +1,33 @@
+## Summary / Description
+
+Short description of the bug.
+
+## Version
+
+Version in which the bug occurs.
+
+## Steps to reproduce
+
+How one can reproduce the issue - **this is very important**
+
+## Expected behaviour
+
+What you expected to happen.
+
+## Actual behavior
+
+What actually happens.
+
+### Additional
+
+**Possible fix**
+
+If you can, link to the line of code that might be responsible
+for the problem or create a pull request if you have created
+the fix already.
+
+***Miscellaneous***
+
+Add any other information like screenshots. You can also paste
+any relevant logs. Please use code blocks (```) to format console
+output, logs, and code as it's very hard to read otherwise.

.github/ISSUE_TEMPLATE/feature-request.md

@@ -0,0 +1,21 @@
+## Summary / Description
+
+Summarize your idea for a new feature.
+
+## Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+## Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or
+features you've considered.
+
+## Possible solution
+
+If you can provide the feature by yourself, please either
+include the corresponding code or even better create a
+pull request.
+
+If you paste code, please use code blocks (```) for formatting
+since it's otherwise very hard to read.

.github/workflows/tests.yml

@@ -0,0 +1,38 @@
+name: Tests
+on: [push, pull_request]
+jobs:
+  tests:
+    name: Tests with PHP${{ matrix.php }}
+    runs-on: ubuntu-20.04
+    strategy:
+      matrix:
+        php: [7.2, 7.3, 7.4]
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Setup PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php }}
+          extensions: zip
+
+      - name: Get composer cache directory
+        id: composer-cache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composer-cache.outputs.dir }}
+          key: ${{ runner.os }}-php-${{ matrix.php }}-composer-${{ hashFiles('**/composer.json') }}
+          restore-keys: ${{ runner.os }}-php-${{ matrix.php }}-composer-
+
+      - name: Install dependencies
+        run: composer install --prefer-dist --no-progress --no-suggest --optimize-autoloader
+
+      - name: Run Tests
+        run: |
+          composer tests:unit
+          composer cs
+

composer.json

@@ -18,7 +18,7 @@
         "sort-packages": true
     },
     "require": {
-        "php": "^7.1",
+        "php": "^7.2",
         "ext-json": "*",
         "ext-zip": "*",
         "symfony/console": "^5.1",
@@ -27,7 +27,7 @@
         "symfony/mime": "^5.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9.4",
+        "phpunit/phpunit": "^8.5",
         "typo3/coding-standards": "^0.2.0"
     },
     "bin": [
@@ -48,7 +48,7 @@
             "@php vendor/bin/phpunit --testsuite Unit"
         ],
         "cs": [
-            "@php vendor/bin/php-cs-fixer fix --config=vendor/typo3/coding-standards/templates/extension_php_cs.dist src/ tests/"
+            "@php vendor/bin/php-cs-fixer fix --dry-run --diff --diff-format=udiff --config=vendor/typo3/coding-standards/templates/extension_php_cs.dist src/ tests/"
         ]
     }
 }

tests/Unit/Validation/VersionValidatorTest.php

@@ -24,7 +24,7 @@ class VersionValidatorTest extends TestCase
      * @param string $input
      * @param bool $expected
      */
-    public function isValidTest(string$input, bool $expected): void
+    public function isValidTest(string $input, bool $expected): void
     {
         self::assertEquals($expected, (new VersionValidator())->isValid($input));
     }