getContainer()->bind(CommandBus::class, function () { return \Mockery::mock(CommandBus::class) ->shouldReceive('handle') ->andReturn('Hello World') ->getMock(); }); $request = new HelloRequest(); $request->setName('World'); $context = \Mockery::mock(ContextInterface::class); $handler = new GreeterHandler(); $response = $handler->SayHello($context, $request); $this->assertEquals('Hello World', $response->getMessage()); } }