diff --git a/core/tests/Drupal/Tests/ComposerIntegrationTest.php b/core/tests/Drupal/Tests/ComposerIntegrationTest.php
index 80a18b6..a64804c 100644
--- a/core/tests/Drupal/Tests/ComposerIntegrationTest.php
+++ b/core/tests/Drupal/Tests/ComposerIntegrationTest.php
@@ -74,19 +74,18 @@ protected function getPaths() {
   public function testComposerJson() {
     foreach ($this->getPaths() as $path) {
       $json = file_get_contents($path . '/composer.json');
-
       $result = json_decode($json);
       $this->assertNotNull($result, $this->getErrorMessages()[json_last_error()]);
     }
   }
 
   /**
-   * Tests composer.lock hash.
+   * Tests composer.lock content-hash.
    */
   public function testComposerLockHash() {
-    $json = file_get_contents($this->root . '/composer.json');
+    $content_hash = self::getContentHash(file_get_contents($this->root . '/composer.json'));
     $lock = json_decode(file_get_contents($this->root . '/composer.lock'), TRUE);
-    $this->assertSame(md5($json), $lock['hash']);
+    $this->assertSame($content_hash, $lock['content-hash']);
   }
 
   /**
@@ -126,4 +125,50 @@ public function testAllModulesReplaced() {
     }
   }
 
+  // @codingStandardsIgnoreStart
+  /**
+   * The following method is copied from \Composer\Package\Locker.
+   *
+   * @see https://github.com/composer/composer
+   */
+  /**
+   * Returns the md5 hash of the sorted content of the composer file.
+   *
+   * @param string $composerFileContents The contents of the composer file.
+   *
+   * @return string
+   */
+  protected static function getContentHash($composerFileContents)
+  {
+    $content = json_decode($composerFileContents, true);
+
+    $relevantKeys = array(
+      'name',
+      'version',
+      'require',
+      'require-dev',
+      'conflict',
+      'replace',
+      'provide',
+      'minimum-stability',
+      'prefer-stable',
+      'repositories',
+      'extra',
+    );
+
+    $relevantContent = array();
+
+    foreach (array_intersect($relevantKeys, array_keys($content)) as $key) {
+      $relevantContent[$key] = $content[$key];
+    }
+    if (isset($content['config']['platform'])) {
+      $relevantContent['config']['platform'] = $content['config']['platform'];
+    }
+
+    ksort($relevantContent);
+
+    return md5(json_encode($relevantContent));
+  }
+  // @codingStandardsIgnoreEnd
+
 }