使用 Moq,是否可以设置模拟属性以使其发生变异?
例如,给定:
public interface IService // To be mocked.
{
bool IsConnected { get; }
}
是否可以设置 IService 的模拟,以便以下通过?
var mockService = new Mock<IService>();
// Setup mockService so IsConnected mutates...?
bool before = mockService.Object.IsConnected;
bool after = mockService.Object.IsConnected;
Assert.AreNotEqual(before, after);
当然,这种设置并不能解决问题:
mockService.SetupGet(service => service.IsConnected).Returns(false);
mockService.SetupGet(service => service.IsConnected).Returns(true);
这与我的理解是一致的,即 Moq 没有实现记录/回放模型。
这是一个更现实的例子:
public interface IService // To be mocked.
{
bool IsConnected { get; }
void Connect(); // Mutates IsConnected.
}
class Client // To be tested
{
private readonly IService service;
public Client(IService service)
{
this.service = service;
}
public bool DoWork()
{
if (!service.IsConnected) // In test, IsConnected should return false.
{
service.Connect();
}
if (!service.IsConnected) // In test, IsConnected should return true.
{
return false;
}
// ... yada yada yada more code
return true;
}
}
我使用的是 Moq 4.0.10827.0。
最佳答案
您可以将返回设置为 Func<bool>
而不是 bool 值。然后您将编写该 func 以更改其结果。像....
bool isConnected = false
var mockService = new Mock<IService>();
// Setup mockService so IsConnected mutates...?
mockService.Setup(s => s.Connect()).Callback(() => isConnected = true);
mockService.SetupGet(s => s.IsConnected).Returns(() => isConnected);
bool before = mockService.Object.IsConnected;
mockService.Object.Connect();
bool after = mockService.Object.IsConnected;
Assert.AreNotEqual(before, after);
但是,根据您的服务变得多么复杂,您可能需要考虑制作 FakeService 并使用它而不是模拟。
关于c# - 模拟副作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10931930/