contains() public method

public contains ( $word )
 public function testConstructorPreserveWords()
 {
     $words = array('word1', 'word2');
     $dictionary = new ArrayDictionary($words);
     $this->assertEquals(2, $dictionary->count());
     $this->assertTrue($dictionary->contains('word1'));
     $this->assertTrue($dictionary->contains('word2'));
 }