Tests that services provided by module bundles get registered to the DIC.
function testBundleRegistration() {
$this
->assertTrue(drupal_container()
->getDefinition('file.usage')
->getClass() == 'Drupal\\bundle_test\\TestFileUsage', 'Class has been changed');
$this
->assertTrue(drupal_container()
->has('bundle_test_class'), 'The bundle_test_class service has been registered to the DIC');
// The event subscriber method in the test class calls drupal_set_message with
// a message saying it has fired. This will fire on every page request so it
// should show up on the front page.
$this
->drupalGet('');
$this
->assertText(t('The bundle_test event subscriber fired!'), 'The bundle_test event subscriber fired');
}