如何在nsubstitute模拟上测试set方法

Question

我现在完全重写了这个，因为我正坐在我的项目前面。我仍然有理解如何正确编写测试的问题。

这里是一流的，我想测试：

namespace Snowball.Controllers 
{ 
    public class FollowCameraController : ICameraController 
    { 
     private ITransform player; 
     private ITransform camera; 
     private IVector3Utility utility; 
     private IVector3 offset; 

     public FollowCameraController(ITransform player, ITransform camera, IVector3Utility utility) 
     { 
      this.player = player; 
      this.camera = camera; 
      this.utility = utility; 

      offset = utility.Subtract(camera.Position, player.Position); 
     } 

     public void UpdateCameraPosition() 
     { 
      IVector3 playerPosition = player.Position; 

      IVector3 newCameraPosition = utility.Add(playerPosition, offset); 

      camera.Position = newCameraPosition; 
     } 
    } 
} 

这里是我运行测试套件，它是在浴室的唯一的测试，现在，我想测试：

namespace FrameworkTests 
{ 
    [TestFixture] 
    public class FollowCameraControllerTest 
    { 
     private ITransform cameraTransformMock; 
     private ITransform playerTransformMock; 
     private IVector3Utility utilityMock; 

     private IVector3 offset; 

     private FollowCameraController sut; 

     [SetUp] 
     public void Init() 
     { 
      cameraTransformMock = Substitute.For<ITransform>(); 
      playerTransformMock = Substitute.For<ITransform>(); 
      utilityMock = Substitute.For<IVector3Utility>(); 

      offset = Substitute.For<IVector3>(); 

      utilityMock.Subtract(Arg.Any<IVector3>(), Arg.Any<IVector3>()).Returns(offset); 

      sut = new FollowCameraController(cameraTransformMock, playerTransformMock, utilityMock); 

      var temp = utilityMock.Received().Subtract(Arg.Any<IVector3>(), Arg.Any<IVector3>()); 
     } 

     [Test] 
     public void WhenUpdateCameraIsCalledThenCameraPositionIsUpdated() 
     { 
      //var playerPosition = Substitute.For<IVector3>(); 
      var cameraPosition = Substitute.For<IVector3>(); 

      var playerPosition = playerTransformMock.Position; 

      utilityMock.Add(playerPosition, offset).Returns(cameraPosition); 

      //var temp = cameraTransformMock.Position; 
      //cameraTransformMock.Position = cameraPosition; 

      sut.UpdateCameraPosition(); 

      var temp = playerTransformMock.Received().Position; 
      temp = utilityMock.Received().Add(playerPosition, offset); 
      //cameraTransformMock.Received().Position = cameraPosition; 
     } 
    } 
} 

该测试失败，出现以下失败的测试输出：

结果消息： NSubstitute.Exceptions.ReceivedCallsException：预期接收CA ll匹配：

添加（IVector3Proxy，IVector3Proxy） 实际上收到没有匹配的调用。 接受1不匹配的调用（用表示不匹配的参数“*”字符）： 添加（IVector3Proxy，IVector3Proxy）

我希望有人能指出我做错了还是怎么，我误用NSubstitute。我迷失在如何测试这个方法

Answer 1

的FollowCameraController构造函数采用player然后camera：

public FollowCameraController(ITransform player, ITransform camera, IVector3Utility utility) { ... } 

但是你的测试实例化sut与camera然后player：

sut = new FollowCameraController(cameraTransformMock, playerTransformMock, utilityMock); 

我认为这是这个问题的很大一部分。 :)

顺便说一句，UpdateCameraPosition更新使用播放器的位置和IVector3Utility实例摄像机的位置，所以我会作出这样的测试重点：

[Test] 
    public void WhenUpdateCameraIsCalledThenCameraPositionIsUpdated() 
    { 
     var newCameraPosition = Substitute.For<IVector3>(); 
     var playerPosition = playerTransformMock.Position; 
     utilityMock.Add(playerPosition, offset).Returns(newCameraPosition); 

     sut.UpdateCameraPosition(); 

     Assert.AreSame(cameraTransformMock.Position, newCameraPosition); 
    }