public function testHas() {
$asset = $this
->getMock('Assetic\\Asset\\AssetInterface');
$this->am
->set('foo', $asset);
$this
->assertTrue($this->am
->has('foo'), '->has() returns true if the asset is set');
$this
->assertFalse($this->am
->has('bar'), '->has() returns false if the asset is not set');
}