Enforce code coverage via coverage-guard

.github/workflows/checks.yml

@@ -33,21 +33,6 @@ jobs:
                     XDEBUG_MODE: coverage
                 run: composer check
 
-            -
-                name: Output line coverage
-                run: head cache/coverage/coverage.txt | grep Lines
-
-            -
-                name: Report patch coverage
-                if: github.event_name == 'pull_request'
-                run: |
-                    if git diff --name-only ${{ github.event.pull_request.base.sha }} | grep -q '\.php$'; then
-                        git diff ${{ github.event.pull_request.base.sha }} > changes.patch
-                        vendor/bin/phpcov patch-coverage --path-prefix $(pwd) cache/coverage/coverage.cov changes.patch || true
-                    else
-                        echo "No PHP files changed, skipping patch coverage report"
-                    fi
-
     cda:
         runs-on: ubuntu-latest
         strategy:
@@ -66,7 +51,9 @@ jobs:
                     ini-file: development
             -
                 name: Update dependencies
-                run: composer update --no-progress --prefer-dist --no-interaction
+                run: |
+                    composer remove --dev shipmonk/coverage-guard --no-update
+                    composer update --no-progress --prefer-dist --no-interaction
             -
                 name: Run dependency analyser
                 run: composer check:dependencies
@@ -89,7 +76,9 @@ jobs:
                     ini-file: development
             -
                 name: Update dependencies
-                run: composer update --no-progress --prefer-dist --no-interaction
+                run: |
+                    composer remove --dev shipmonk/coverage-guard --no-update
+                    composer update --no-progress --prefer-dist --no-interaction
             -
                 name: Run PHPStan
                 run: composer check:types
@@ -113,7 +102,9 @@ jobs:
                     ini-file: development
             -
                 name: Update dependencies
-                run: composer update --no-progress --${{ matrix.dependency-version }} --prefer-dist --no-interaction  ${{ matrix.php-version == '8.5' && '--ignore-platform-req=php+' || '' }}
+                run: |
+                    composer remove --dev shipmonk/coverage-guard --no-update
+                    composer update --no-progress --${{ matrix.dependency-version }} --prefer-dist --no-interaction
             -
                 name: Run tests
                 run: vendor/bin/phpunit --no-coverage tests

composer.json

@@ -33,6 +33,7 @@
         "phpunit/phpunit": "^9.6.22",
         "shipmonk/coding-standard": "^0.2.0",
         "shipmonk/composer-dependency-analyser": "^1.8.2",
+        "shipmonk/coverage-guard": "dev-master",
         "shipmonk/name-collision-detector": "^2.1.1",
         "shipmonk/phpstan-dev": "^0.1.1",
         "shipmonk/phpstan-rules": "^4.1.0",
@@ -78,7 +79,7 @@
             "@check:ec",
             "@check:cs",
             "@check:types",
-            "@check:tests",
+            "@check:coverage",
             "@check:collisions",
             "@check:dependencies"
         ],
@@ -87,6 +88,10 @@
             "composer normalize --dry-run --no-update-lock",
             "composer validate --strict"
         ],
+        "check:coverage": [
+            "XDEBUG_MODE=coverage phpunit tests --coverage-clover cache/clover.xml",
+            "coverage-guard check cache/clover.xml"
+        ],
         "check:cs": "phpcs",
         "check:dependencies": "composer-dependency-analyser",
         "check:ec": "ec src tests",

coverage-guard.php

@@ -0,0 +1,65 @@
+<?php
+
+use PHPStan\Collectors\Collector;
+use PHPStan\Rules\Rule;
+use ShipMonk\CoverageGuard\Config;
+use ShipMonk\CoverageGuard\Hierarchy\ClassMethodBlock;
+use ShipMonk\CoverageGuard\Hierarchy\CodeBlock;
+use ShipMonk\CoverageGuard\Rule\CoverageError;
+use ShipMonk\CoverageGuard\Rule\CoverageRule;
+use ShipMonk\CoverageGuard\Rule\InspectionContext;
+use ShipMonk\PHPStan\DeadCode\Compatibility\BackwardCompatibilityChecker;
+use ShipMonk\PHPStan\DeadCode\Provider\MemberUsageProvider;
+use ShipMonk\PHPStan\DeadCode\Reflection\ReflectionHelper;
+
+$config = new Config();
+$config->addRule(new class implements CoverageRule {
+
+    public function inspect(
+        CodeBlock $codeBlock,
+        InspectionContext $context
+    ): ?CoverageError
+    {
+        if (!$codeBlock instanceof ClassMethodBlock) {
+            return null;
+        }
+
+        if ($codeBlock->getExecutableLinesCount() < 5) {
+            return null;
+        }
+
+        $coverage = $codeBlock->getCoveragePercentage();
+        $classReflection = $codeBlock->getMethodReflection()->getDeclaringClass();
+        $requiredCoverage = $this->getRequiredCoverage($classReflection);
+
+        if ($codeBlock->getCoveragePercentage() < $requiredCoverage) {
+            return CoverageError::create("Method <white>{$codeBlock->getMethodName()}</white> requires $requiredCoverage% coverage, but has only $coverage%.");
+        }
+
+        return null;
+    }
+
+    /**
+     * @param ReflectionClass<object> $classReflection
+     */
+    private function getRequiredCoverage(ReflectionClass $classReflection): int
+    {
+        $isPoor = in_array($classReflection->getName(), [
+            BackwardCompatibilityChecker::class,
+            ReflectionHelper::class,
+        ], true);
+
+        $isCore = $classReflection->implementsInterface(MemberUsageProvider::class)
+            || $classReflection->implementsInterface(Collector::class)
+            || $classReflection->implementsInterface(Rule::class);
+
+        return match (true) {
+            $isCore => 80,
+            $isPoor => 20,
+            default => 50,
+        };
+    }
+
+});
+
+return $config;

phpunit.xml.dist

@@ -15,13 +15,6 @@
         <include>
             <directory suffix=".php">src</directory>
         </include>
-        <report>
-            <clover outputFile="cache/coverage/phpstorm/clover.xml"/>
-            <cobertura outputFile="cache/coverage/ci/cobertura.xml"/>
-            <html outputDirectory="cache/coverage/html"/>
-            <text outputFile="cache/coverage/coverage.txt"/>
-            <php outputFile="cache/coverage/coverage.cov"/>
-        </report>
     </coverage>
     <php>
         <ini name="error_reporting" value="-1"/>

tests/Rule/data/providers/custom.php

@@ -7,6 +7,8 @@ class Methods
     const SOME_CONSTANT = 1; // error: Unused CustomProvider\Methods::SOME_CONSTANT
 
     public function method(): void {}
+
+    public function mixedTestThatExcludersCanExcludeProvidedUsage(): void {} // error: Unused CustomProvider\Methods::mixedTestThatExcludersCanExcludeProvidedUsage (all usages excluded by mixedPrefix excluder)
 }
 
 class Constants

tests/Rule/data/providers/phpbench.php

@@ -28,6 +28,11 @@ public function benchWithParams(array $params): void
     {
     }
 
+    #[ParamProviders([1])]
+    public function benchWithInvalidAttributeDontBreakIt(array $params): void
+    {
+    }
+
     public function provideParams(): array
     {
         return [];