Run tests on github Actions

.github/workflows/tests.yml

@@ -0,0 +1,94 @@
+name: Tests
+
+on:
+    push: ~
+    pull_request: ~
+
+jobs:
+    phpcs:
+        name: PHPCS
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v2
+
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 7.2
+                  extensions: curl, mbstring
+                  coverage: none
+                  tools: composer:v2
+
+            - run: composer update --no-progress
+
+            - run: vendor/bin/phpcs --standard=psr12 --colors src tests
+
+    phpunit:
+        name: PHPUnit on ${{ matrix.php }}
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                php: ["7.2", "7.3", "7.4"]
+                coverage: [true]
+                composer-flags: [""]
+                include:
+                    - php: "8.0"
+                      coverage: false
+                      composer-flags: "--ignore-platform-req=php"
+
+        steps:
+            - uses: actions/checkout@v2
+
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+                  extensions: curl, mbstring
+                  coverage: pcov
+                  tools: composer:v2
+
+            - run: composer update --no-progress ${{ matrix.composer-flags }}
+
+            - run: vendor/bin/phpunit --no-coverage
+              if: ${{ !matrix.coverage }}
+
+            - run: vendor/bin/phpunit --coverage-text --coverage-clover=coverage.clover
+              if: ${{ matrix.coverage }}
+
+            - run: bash <(curl -s https://codecov.io/bash) -f coverage.clover
+              if: ${{ matrix.coverage }}
+
+    phpstan:
+        name: PHPStan
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v2
+
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 7.2
+                  extensions: curl, mbstring
+                  coverage: none
+                  tools: composer:v2
+
+            - run: composer update --no-progress
+
+            - run: vendor/bin/phpstan analyse
+
+    psalm:
+        name: Psalm
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v2
+
+            - uses: shivammathur/setup-php@v2
+              with:
+                  php-version: 7.2
+                  extensions: curl, mbstring
+                  coverage: none
+                  tools: composer:v2
+
+            - run: composer update --no-progress
+
+            - run: vendor/bin/psalm