add github actions

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+on:
+    pull_request: null
+    push:
+        branches:
+            - master
+jobs:
+    tests:
+        runs-on: ubuntu-latest
+        strategy:
+            matrix:
+                php: ['7.3', '7.4', '8.0']
+
+        name: Linting - PHP ${{ matrix.php }}
+        steps:
+            -   uses: actions/checkout@v2
+            -   uses: shivammathur/setup-php@v2
+                with:
+                    php-version: ${{ matrix.php }}
+                    coverage: none
+                    extensions: intl
+            -   run: composer install --no-progress
+            -   run: composer codestyle
+            -   run: composer phpstan
+            -   run: composer tests

composer.json

@@ -24,6 +24,21 @@
  		"psr-4": { "Michelf\\": "Michelf/" }
 	},
 	"require-dev": {
-		"phpunit/phpunit": ">= 9.5"
+		"phpspec/prophecy": "^1.6",
+		"friendsofphp/php-cs-fixer": "^3.0",
+		"phpunit/phpunit": "^9.5",
+		"phpstan/phpstan": "^1.0",
+		"phpstan/phpstan-phpunit": "^1.0"
+	},
+
+	"scripts": {
+		"tests": "vendor/bin/phpunit test/",
+		"phpstan": [
+			"vendor/bin/phpstan analyse Michelf/ --level=5",
+			"vendor/bin/phpstan analyse -c test/phpstan.neon test/ --level=5"
+		],
+		"codestyle": "vendor/bin/php-cs-fixer fix --dry-run --verbose --show-progress=none",
+		"codestyle-fix": "vendor/bin/php-cs-fixer fix"
 	}
+
 }

test/phpstan.neon

@@ -0,0 +1,2 @@
+includes:
+    - ../vendor/phpstan/phpstan-phpunit/extension.neon