public function testReturnsIfOperationExists()
 {
     $s = new Service(['operations' => ['foo' => ['input' => []]]], function () {
         return [];
     });
     $this->assertTrue($s->hasOperation('foo'));
     $this->assertInstanceOf('Vws\\Api\\Operation', $s->getOperation('foo'));
     $this->assertArrayHasKey('foo', $s->getOperations());
 }