/** * @expectedException \Laelaps\Bundle\Facebook\Exception\InvalidFacebookConfigurationPrefix */ public function testThatInvalidPrefixIsDetected() { TestExtension::setFacebookConfigurationPrefix($arbitraryNumberInsteadOfString = 123); $this->assertFalse(TestExtension::isLoaded()); $this->getKernel(); $this->assertTrue(TestExtension::isLoaded()); }