/**
  * Tests that the Stable base theme is installed if necessary.
  */
 public function testUpdateHookN()
 {
     $this->assertTrue($this->themeHandler->themeExists('test_stable'));
     $this->assertFalse($this->themeHandler->themeExists('stable'));
     $this->runUpdates();
     // Refresh the theme handler now that Stable has been installed.
     $this->themeHandler->refreshInfo();
     $this->assertTrue($this->themeHandler->themeExists('stable'));
 }