public function testCreatingEmptyWordListAndCountingParticularWordOccurences()
{
$wordList = new WordList();
$wordList->addWord('foo');
$wordList->addWord('foo');
$wordList->addWord('bar');
$wordList->addWord('baz');
$wordList->addWord('foo');
$this->assertSame(3, $wordList->countWordOccurences('foo'));
$this->assertSame(1, $wordList->countWordOccurences('bar'));
$this->assertSame(1, $wordList->countWordOccurences('baz'));
$this->assertSame(0, $wordList->countWordOccurences('fooz'));
}
