public function testAddingInvalidRules() {
		$before = array(
			Inflector::rules('singular'),
			Inflector::rules('plural'),
			Inflector::rules('transliteration')
		);
		$this->assertNull(Inflector::rules('foo'));
		$this->assertIdentical($before, array(
			Inflector::rules('singular'),
			Inflector::rules('plural'),
			Inflector::rules('transliteration')
		));
	}