Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/tests/Drupal/Tests/Component/DrupalComponentTest.php

@@ -0,0 +1,135 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Tests\Component\DrupalComponentTest.
+ */
+
+namespace Drupal\Tests\Component;
+
+use Drupal\Tests\UnitTestCase;
+use org\bovigo\vfs\vfsStream;
+
+/**
+ * General tests for \Drupal\Component that can't go anywhere else.
+ *
+ * @group Component
+ */
+class DrupalComponentTest extends UnitTestCase {
+
+  /**
+   * Tests that classes in Component do not use any Core class.
+   */
+  public function testNoCoreInComponent() {
+    $component_path = dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__))) . '/lib/Drupal/Component';
+    foreach ($this->findPhpClasses($component_path) as $class) {
+      $this->assertNoCoreUsage($class);
+    }
+  }
+
+  /**
+   * Tests that classes in Component Tests do not use any Core class.
+   */
+  public function testNoCoreInComponentTests() {
+    $component_path = dirname(substr(__DIR__, 0, -strlen(__NAMESPACE__))) . '/tests/Drupal/Tests/Component';
+    foreach ($this->findPhpClasses($component_path) as $class) {
+      $this->assertNoCoreUsage($class);
+    }
+  }
+
+  /**
+   * Searches a directory recursively for PHP classes.
+   *
+   * @param string $dir
+   *   The full path to the directory that should be checked.
+   *
+   * @return array
+   *   An array of class paths.
+   */
+  protected function findPhpClasses($dir) {
+    $classes = array();
+    foreach (new \DirectoryIterator($dir) as $file) {
+      if ($file->isDir() && !$file->isDot()) {
+        $classes = array_merge($classes, $this->findPhpClasses($file->getPathname()));
+      }
+      elseif ($file->getExtension() == 'php') {
+        $classes[] = $file->getPathname();
+      }
+    }
+
+    return $classes;
+  }
+
+  /**
+   * Asserts that the given class is not using any class from Core namespace.
+   *
+   * @param string $class_path
+   *   The full path to the class that should be checked.
+   */
+  protected function assertNoCoreUsage($class_path) {
+    $contents = file_get_contents($class_path);
+    if (preg_match_all('/^.*Drupal\\\Core.*$/m', $contents, $matches)) {
+      foreach ($matches[0] as $line) {
+        if ((strpos($line, '@see ') === FALSE)) {
+          $this->fail(
+            "Illegal reference to 'Drupal\\Core' namespace in $class_path"
+          );
+        }
+      }
+    }
+  }
+
+  /**
+   * Data provider for testAssertNoCoreUseage().
+   *
+   * @return array
+   *   Data for testAssertNoCoreUseage() in the form:
+   *   - TRUE if the test passes, FALSE otherwise.
+   *   - File data as a string. This will be used as a virtual file.
+   */
+  public function providerAssertNoCoreUseage() {
+    return array(
+      array(
+        TRUE,
+        '@see \\Drupal\\Core\\Something',
+      ),
+      array(
+        FALSE,
+        '\\Drupal\\Core\\Something',
+      ),
+      array(
+        FALSE,
+        "@see \\Drupal\\Core\\Something\n" .
+        '\\Drupal\\Core\\Something',
+      ),
+      array(
+        FALSE,
+        "\\Drupal\\Core\\Something\n" .
+        '@see \\Drupal\\Core\\Something',
+      ),
+    );
+  }
+
+  /**
+   * @covers \Drupal\Tests\Component\DrupalComponentTest::assertNoCoreUsage
+   * @dataProvider providerAssertNoCoreUseage
+   */
+  public function testAssertNoCoreUseage($expected_pass, $file_data) {
+    // Set up a virtual file to read.
+    $vfs_root = vfsStream::setup('root');
+    vfsStream::newFile('Test.php')->at($vfs_root)->setContent($file_data);
+    $file_uri = vfsStream::url('root/Test.php');
+
+    try {
+      $pass = true;
+      $this->assertNoCoreUsage($file_uri);
+    }
+    catch (\PHPUnit_Framework_AssertionFailedError $e) {
+      $pass = false;
+    }
+    $this->assertEquals($expected_pass, $pass, $expected_pass ?
+      'Test caused a false positive' :
+      'Test failed to detect Core usage');
+  }
+
+}