Code coverage (#72)

Code coverage:
- UI to check which parts of the projects are covered and which aren't
- CI check

Author: kubk

.github/workflows/php.yml

@@ -38,4 +38,8 @@ jobs:
       run: composer install --prefer-dist --no-progress
 
     - name: Run test suite
-      run: composer run-script test
+      run: composer test:with-coverage
+
+    - name: Check coverage
+      run: composer test:coverage-level
+

.gitignore

@@ -6,3 +6,4 @@ vendor
 composer.lock
 node_modules
 .phpunit.cache
+coverage

composer.json

@@ -8,8 +8,9 @@
         }
     ],
     "scripts": {
-        "test": "XDEBUG_MODE=coverage vendor/bin/phpunit",
-        "test:no-coverage": "vendor/bin/phpunit",
+        "test": "vendor/bin/phpunit --no-coverage",
+        "test:with-coverage": "XDEBUG_MODE=coverage vendor/bin/phpunit",
+        "test:coverage-level": "vendor/bin/coverage-check ./coverage/clover.xml 88",
         "test:update-snapshots": "vendor/bin/phpunit -d --update-snapshots",
         "cs:src": "vendor/bin/php-cs-fixer fix src",
         "cs:tests": "vendor/bin/php-cs-fixer fix tests",
@@ -48,6 +49,7 @@
         "myclabs/php-enum": "^1.8",
         "friendsofphp/php-cs-fixer": "^3.0",
         "symfony/var-dumper": "^5.3|^6.0",
-        "phpstan/phpstan": "^1.7"
+        "phpstan/phpstan": "^1.7",
+        "rregeer/phpunit-coverage-check": "^0.3.1"
     }
 }