public function testIsEmpty()
{
// Remove the following lines when you implement this test.
$this->assertFalse($this->object->isEmpty());
$this->object->clear();
$this->assertTrue($this->object->isEmpty());
}
public function test_isEmpty_NotEmpty_ReturnFalse()
{
$h = new HashSet('a');
$this->assertFalse($h->isEmpty());
}
