Add Infection to the pipeline

.gitattributes

@@ -10,6 +10,7 @@ CHANGELOG.md export-ignore
 churn.yml export-ignore
 CONTRIBUTING.md export-ignore
 img/ export-ignore
+infection.json export-ignore
 Makefile export-ignore
 manifest.xml export-ignore
 phpcs.xml export-ignore

.github/workflows/continuous-integration.yml

@@ -128,8 +128,8 @@ jobs:
           name: coverage
           path: ./coverage-${{ matrix.vcs }}.xml
 
-  analysis:
-    name: "Static Analysis"
+  coverage:
+    name: "Code coverage"
     runs-on: ubuntu-latest
     # Run after "test-vcs" to gather all code coverage reports
     needs: [test-vcs]
@@ -144,6 +144,57 @@ jobs:
           coverage: "pcov"
           ini-values: "error_reporting=-1, display_errors=On, display_startup_errors=On, zend.assertions=1"
           php-version: "8.0"
+          tools: composer:v2
+
+      - name: Get composer cache directory
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: composer-${{ runner.os }}-8.0-${{ hashFiles('composer.*') }}
+          restore-keys: |
+            composer-${{ runner.os }}-8.0-
+            composer-${{ runner.os }}-
+            composer-
+
+      - name: "Install dependencies"
+        run: "composer update --no-interaction --no-scripts --no-progress --prefer-dist"
+
+      - name: "Calculate code coverage"
+        run: "vendor/bin/simple-phpunit --colors=always --testdox --testsuite churn-tests --coverage-clover=coverage.xml"
+
+      - name: "Download other code coverage reports"
+        uses: actions/download-artifact@v2
+        with:
+          name: coverage
+          path: ./coverage
+
+      - name: "List all coverage reports"
+        run: echo coverage_reports=./coverage/$(ls -m coverage/ | sed "s/, */,.\/coverage\//g") >> $GITHUB_ENV
+
+      - uses: codecov/codecov-action@v1
+        with:
+          files: ./coverage.xml,${{ env.coverage_reports }}
+          fail_ci_if_error: true
+          verbose: true
+
+  analysis:
+    name: "Static Analysis"
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
+        with:
+          coverage: "none"
+          ini-values: "error_reporting=-1, display_errors=On, display_startup_errors=On, zend.assertions=1"
+          php-version: "8.0"
           tools: composer:v2, composer-normalize
 
       - name: Get composer cache directory
@@ -187,29 +238,49 @@ jobs:
       - name: "Normalize composer.json"
         run: "composer-normalize --dry-run --no-check-lock --no-update-lock"
 
-      - name: "Calculate code coverage"
-        run: "vendor/bin/simple-phpunit --colors=always --testdox --testsuite churn-tests --coverage-clover=coverage.xml"
+  mutation:
+    name: "Mutation testing"
+    runs-on: ubuntu-latest
 
-      - name: "Download other code coverage reports"
-        uses: actions/download-artifact@v2
+    steps:
+      - name: "Checkout"
+        uses: "actions/checkout@v2"
+
+      - name: "Install PHP"
+        uses: "shivammathur/setup-php@v2"
         with:
-          name: coverage
-          path: ./coverage
+          coverage: "pcov"
+          ini-values: "error_reporting=-1, display_errors=On, display_startup_errors=On, zend.assertions=1"
+          php-version: "8.0"
+          tools: composer:v2, infection
 
-      - name: "List all coverage reports"
-        run: echo coverage_reports=./coverage/$(ls -m coverage/ | sed "s/, */,.\/coverage\//g") >> $GITHUB_ENV
+      - name: Get composer cache directory
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
-      - uses: codecov/codecov-action@v1
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
         with:
-          files: ./coverage.xml,${{ env.coverage_reports }}
-          fail_ci_if_error: true
-          verbose: true
+          path: ${{ steps.composercache.outputs.dir }}
+          key: composer-${{ runner.os }}-8.0-${{ hashFiles('composer.*') }}
+          restore-keys: |
+            composer-${{ runner.os }}-8.0-
+            composer-${{ runner.os }}-
+            composer-
+
+      - name: "Install dependencies"
+        run: "composer update --no-interaction --no-scripts --no-progress --prefer-dist"
+
+      - name: "Run Infection"
+        run: |
+          git fetch --depth=1 origin $GITHUB_BASE_REF
+          infection -j$(nproc) --logger-github --git-diff-filter=AM --git-diff-base=origin/$GITHUB_BASE_REF --ignore-msi-with-no-mutations --min-msi=85 --min-covered-msi=95
 
   build:
     name: "Build Phar"
     runs-on: ubuntu-latest
     # Build when everything else is ok
-    needs: [tests, analysis]
+    needs: [tests, analysis, coverage, mutation]
 
     steps:
       - name: "Checkout"

.gitignore

@@ -3,6 +3,7 @@
 /composer.lock
 /coverage.xml
 /docs/
+/infection.log
 /phpunit.xml
 /vendor/
 /vendor-bin/**/vendor

bin/CyclomaticComplexityAssessorRunner

@@ -6,5 +6,11 @@ require_once __DIR__ . '/bootstrap.php';
 use Churn\Assessor\CyclomaticComplexityAssessor;
 
 $file = $argv[1];
+$contents = \file_get_contents($file);
+if ($contents === false) {
+    echo 0;
+    return;
+}
+
 $assessor = new CyclomaticComplexityAssessor();
-echo $assessor->assess($file);
+echo $assessor->assess($contents);

bin/app.php

@@ -7,11 +7,11 @@
 use Composer\InstalledVersions;
 use Symfony\Component\Console\Application;
 
-$application = new Application('churn-php', (function (string $package): string {
+$application = new Application('churn-php', (static function (string $package): string {
     $version = InstalledVersions::getPrettyVersion($package);
     $ref = InstalledVersions::getReference($package);
     if ($ref) {
-        $version .= '@' . \substr($ref, 0, 7);
+        $version .= '@' . substr($ref, 0, 7);
     }
 
     return $version;

bin/bootstrap.php

@@ -1,16 +1,24 @@
 <?php
 
+declare(strict_types=1);
+
 error_reporting(E_ALL);
 ini_set('display_errors', 'stderr');
 
-if (is_file($autoload = __DIR__ . '/../vendor/autoload.php')) {
-    require_once($autoload);
-} elseif (is_file($autoload = __DIR__ . '/../../../autoload.php')) {
-    require_once($autoload);
-} else {
-    fwrite(STDERR,
-        'You must set up the project dependencies first. Run the following command:'.PHP_EOL.
-        'composer install'.PHP_EOL
-    );
-    exit(1);
+foreach (
+    [
+    __DIR__ . '/../vendor/autoload.php',
+    __DIR__ . '/../../../autoload.php',
+    ] as $autoload
+) {
+    if (is_file($autoload)) {
+        return require_once $autoload;
+    }
 }
+
+fwrite(
+    STDERR,
+    'You must set up the project dependencies first. Run the following command:' . PHP_EOL .
+    'composer install' . PHP_EOL
+);
+exit(1);

infection.json

@@ -0,0 +1,15 @@
+{
+    "$schema": "https://raw.githubusercontent.com/infection/infection/0.26.0/resources/schema.json",
+    "source": {
+        "directories": [
+            "src"
+        ]
+    },
+    "logs": {
+        "text": "infection.log"
+    },
+    "mutators": {
+        "@default": true,
+	"@cast": false
+    }
+}

phpcs.xml

@@ -7,6 +7,7 @@
   <config name="php_version" value="70103"/>
 
   <file>./src</file>
+  <file>./bin</file>
 
   <rule ref="PSR12"/>
 

phpunit.xml.dist

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <phpunit
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-    xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+    xsi:noNamespaceSchemaLocation="vendor/bin/.phpunit/phpunit.xsd"
     bootstrap="vendor/autoload.php"
     colors="true"
     convertDeprecationsToExceptions="true"
@@ -18,11 +18,11 @@
             <directory>tests/Unit</directory>
         </testsuite>
     </testsuites>
-    <filter>
-        <whitelist>
+    <coverage>
+        <include>
             <directory suffix=".php">src</directory>
-        </whitelist>
-    </filter>
+        </include>
+    </coverage>
     <php>
         <env name="SYMFONY_PHPUNIT_REMOVE_RETURN_TYPEHINT" value="1" />
     </php>