Test: Refactor integration tests to make them more versatile

tests/Integration/CodingStandardTest.php

@@ -9,25 +9,23 @@
  */
 class CodingStandardTest extends TestCase
 {
+    private string $tempFixtureFile;
+
+    /** @after */
+    protected function cleanUpTempFixtureFile(): void
+    {
+        unlink($this->tempFixtureFile);
+    }
+
     /**
      * @test
      * @dataProvider provideFilesToFix
      */
     public function shouldFixFile(string $wrongFile, string $correctFile): void
     {
-        // copy wrongFile to a new temporary file
-        $fixtureFile = tempnam(sys_get_temp_dir(), 'ecs-test');
-        if ($fixtureFile === false) {
-            $this->fail('Could not create temporary file');
-        }
-        copy($wrongFile, $fixtureFile);
-
-        shell_exec(
-            __DIR__ . '/../../vendor/bin/ecs check --no-progress-bar --no-ansi --no-interaction --fix ' . $fixtureFile,
-        );
+        $fixedFile = $this->runEcsCheckOnFile($wrongFile);
 
-        $this->assertStringEqualsFile($correctFile, file_get_contents($fixtureFile));
-        unlink($fixtureFile);
+        $this->assertStringEqualsFile($correctFile, file_get_contents($fixedFile));
     }
 
     public function provideFilesToFix(): array
@@ -40,4 +38,34 @@ public function provideFilesToFix(): array
             ],
         ];
     }
+
+    private function runEcsCheckOnFile(string $file): string
+    {
+        $fixtureFile = $this->initTempFixtureFile();
+
+        // copy source of wrongFile to a temporary file which will be modified by ECS
+        copy($file, $fixtureFile);
+
+        shell_exec(
+            sprintf(
+                '%s/../../vendor/bin/ecs check --no-progress-bar --no-ansi --no-interaction --fix %s',
+                __DIR__,
+                $fixtureFile,
+            ),
+        );
+
+        return $fixtureFile;
+    }
+
+    private function initTempFixtureFile(): string
+    {
+        // Create new file in temporary directory
+        $fixtureFile = tempnam(sys_get_temp_dir(), 'ecs-test');
+        if ($fixtureFile === false) {
+            $this->fail('Could not create temporary file');
+        }
+        $this->tempFixtureFile = $fixtureFile; // store to be able to remove it later
+
+        return $fixtureFile;
+    }
 }