[英]Mocking a method that throws exception if something went wrong using NSubstitute
I have implemented a service in my .NET Core application, that I call to validate my model. 我已经在.NET Core应用程序中实现了一项服务,调用该服务来验证我的模型。 Unfortunately, the service (not mine) throws an exception if it's invalid and simply responds with a 200 OK if it's valid (since it's a void method).
不幸的是,服务(不是我的)如果无效则抛出异常,如果有效则简单地以200 OK响应(因为它是void方法)。
So basically I do something like this: 所以基本上我做这样的事情:
try {
await _service.ValidateAsync(model);
return true;
} catch(Exception e) {
return false;
}
I am trying to mock the method inside of ValidateAsync
, that sends the request to the service I implemented. 我试图模拟
ValidateAsync
内的方法,该方法将请求发送到我实现的服务。 ValidateAsync
only converts my controller's input from something on my frontend, to something the Validate
method understands. ValidateAsync
仅将控制器的输入从前端的某些内容转换为Validate
方法可以理解的内容。
However, I am unable to really see how I am supposed to test this. 但是,我无法真正看到应如何测试。 Here's what I have tried, but it doesn't really make any sense to me.
这是我尝试过的方法,但对我来说真的没有任何意义。
[TestMethod]
public void InvalidTest() {
var model = new Model(); // obviously filled out with what my method accepts
_theService.Validate(model)
.When(x => { }) //when anything
.Do(throw new Exception("didn't work")); //throw an exception
//Assert should go here.. but what should it validate?
}
So basically: When this is called -> throw an exception
. 基本上
When this is called -> throw an exception
这样: When this is called -> throw an exception
。
How am I supposed to mock that using NSubstitute? 我应该如何使用NSubstitute模拟它?
Based on current explanation the assumption is something like 根据目前的解释,假设类似于
public class mySubjectClass {
private ISomeService service;
public mySubjectClass(ISomeService service) {
this.service = service;
}
public async Task<bool> SomeMethod(Model model) {
try {
await service.ValidateAsync(model);
return true;
} catch(Exception e) {
return false;
}
}
}
In order to cover a false path for SomeMethod
, the dependency needs to throw an exception when invoked so that the test can be exercised as expected. 为了覆盖
SomeMethod
的错误路径,依赖项在调用时需要引发异常,以便可以按预期执行测试。
[TestMethod]
public async Task SomeMethod_Should_Return_False_For_Invalid_Model() {
//Arrange
var model = new Model() {
// obviously filled out with what my method accepts
};
var theService = Substitute.For<ISomeService>();
theService
.When(_ => _.ValidateAsync(Arg.Any<Model>()))
.Throw(new Exception("didn't work"));
var subject = new mySubjectClass(theService);
var expected = false;
//Act
var actual = await subject.SomeMethod(model);
//Assert
Assert.AreEqual(expected, actual);
}
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.