How to Mock another method of same class we are testing in c# without dependency injection

2019-11-14 05:11 Rahul Sharma imported from Stackoverflow

I am facing one scenario where I need to mock another method of the same class in c#. But I am facing issue to mock another method and the same I am sharing below.

 Interface --> 

  public interface IFetch
  {
     string GetColorCodes();

     string FetchData();

  }

  Class-->
 public class Fetch : IFetch 
 {

    public Fetch()
    {
     //I dont have any dependency injection
    }

   public string GetColorCodes() {
    return "Yellow";
   }

   public string FetchData(){
   string  color= GetColorCodes();
   return color;
 }

Now, while creating a unit test for testing FetchData() method I don't want it should internally call GetColorCodes() method and returns "Yellow". I want to return some other color like "Red". Since there is no dependency and method is in the same class I am not able to find out the way. If anyone has an idea please share with this sample code

[TestFixture]
class FetchTest 
{
   [Test]
   public void FetchDataTest()
  {
   Fetch obj=new Fetch();
   string color= obj.FetchData();
  Assert.IsEquals(color,"Red")
  }

}

I want to mock the GetColorCodes() method from the test to Return Red color.

2 answers

answered 2019-11-14 05:18 Michael Kokorin

FetchData method doesn't have any dependencies here. You can't mock part of class to test another part of class. You need to introduce some dependency here, e.g. like this:

   public interface IColorProvider
   {
       string GetColor();
   }

   public class DefaultColorProvider : IColorProvider
   {
       public string GetColor => "Yellow";
   }

    public class Fetch : IFetch 
    {
        private readonly IColorProvider _colorProvider;
        public Fetch(IColorProvider colorProvider)
        {
          _colorProvider = colorProvider
        }

        public string FetchData(){
        string  color= _colorProvider.GetColor()
        return color;
    }

In this case - you have clear dependency and you can mock behavior of IColorProvider and test behavior of FetchData.

UPDATE: You can do something like this:

    public class Fetch : IFetch 
    {
        private readonly IColorProvider _colorProvider;
        public Fetch(IColorProvider colorProvider)
        {
          _colorProvider = colorProvider
        }

        public string GetColorCodes() {
             return _colorProvider.GetColor();
        }

        public string FetchData(){
        string  color= GetColorCodes();
        return color;
    }

So changes in the class will be very small but it will give you ability to test this.

answered 2019-11-14 05:36 CRice

If you have no problems with making GetColorCodes() virtual then you can use the Extract and Override test pattern. In your test, new up FetchStub with the mock value you wish to use and call your method under test FetchData from the same instance:

public class FetchStub : Fetch
{
    private readonly string _colorCode;
    public FetchStub(string colorCode)
    {
        _colorCode = colorCode;     
    }

    public override string GetColorCodes()
    {
        return _colorCode;
    }
}


public class Fetch
{

    public Fetch()
    {
        //I dont have any dependency injection
    }

    public virtual string GetColorCodes()
    {
        return "Yellow";
    }

    public string FetchData()
    {
        string color = GetColorCodes();
        return color;
    }
}

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import { Component, OnInit, ViewChild } from '@angular/core';
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import { LeftPanelService } from '../../services/left-panel/left-panel.service';
import { RoleService } from '../../services/role/role.service';
import { MenuService } from '../../services/menu/menu.service';

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    public roleService: RoleService,
    private menuService: MenuService) {
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     // check site admin
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      title: this.messages.LockPopup.LockedInEditDetails,
      footerButtons: [
        { Text: 'Ok', event: 'ok', cssClass: 'footer-modal-popup-ok' },
      ],
    };
  }

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    if (this.isSiteAdmin || this.isEditor) {
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    } else if (this.isUser || this.isProjectApprover || this.isScenarioApprover || this.isActorApprover
      || this.isUsecaseApprover || this.isPolicyApprover || this.isFtpApprover || this.isAdmin) {
      this.isOtherMenuOptionDisabled = true;
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  }
  //#endregion

  /**
   * Method to initialize Main Page Menu Options
   */
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    // this.mainPageMenu = this.menuService.getMainPageMenu();

    /**
     * Method to disable all the remaining options other than view and create from FrameObject Menu
     */
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          dropDown.options.forEach(option => {
            if (this.isOtherMenuOptionDisabled) {
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            } else {
              if (option.key.indexOf('view') > -1 || option.key.indexOf('create') > -1) {
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              } else {
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              }
            }
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            if (this.isOtherMenuOptionDisabled) {
              this.disabledExceptViewFrameObj(option);
            } else {
              option.isDisabled = false;
            }
          });
        }
      });
    });
  }

  disabledExceptViewFrameObj(option) {
    if (option.key.indexOf('view') > -1) {
      option.isDisabled = false;
    } else {
      option.isDisabled = true;
    }
  }

  disableMenuForRoles() {
    this.mainPageMenu.dropdowns.forEach(dropDown => {
      dropDown.options.forEach(option => {
        if (option.key.indexOf('view') > -1) {
          option.isDisabled = false;
        } else {
          if (this.isUser) {
            option.isDisabled = true;
          }
        }
      });
    });
  }
  //#endregion

  //#region Init
  ngOnInit() { }
  //#endregion

  /**
    * Method to hide the who approved pop up
    */
  okWhoApprovedModalPopup() {
    this.whoApprovedPopup.hide();
  }

  /**
    * Method to hide the lock time out pop up
    */
  okLockedInEditDataModalPopup() {
    this.lockedInEditViewChild.hide();
  }

}

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public class CustomExceptionFilter : ExceptionFilterAttribute
{
  public override OnException(ExceptionContext context)
  {
    /* Code here that handles exceptions */
  }
}
```
I've looked everywhere and can't figure out a good way to mock these things in a way that ensures nothing throws an exception due to other missing dependencies. How can I mock ExceptionContext easily?
How can I setup IHttpClientAdapter.GetAsync to return a HttpResponseMessage with particular value for IsSuccessStatusCode?
I have a class that has a dependency on the IHttpClientAdapter, which I am using to call a RESTful API.

I have a test for the method that uses the dependency, so I am mocking the IHttpClientAdapter using Moq. The test should check that when the GetAsync method returns any unsuccessful response, something happens.

One thing that I could do is create a new HttpResponseMessage like so:
```
var response = new HttpResponseMessage
{
    StatusCode = HttpStatusCode.InternalServerError
};
```
Then setup the mocked dependency to return that like so:
```
_httpClientAdapterMock.Setup(x => x.GetAsync(new Uri("http://someuri"))).ReturnsAsync(response);
```
IsSuccessfulStatusCode in this case would evaluate to false, so the test passes as one would expect.

However, this test is not as robust as I'd like it to be, as it only checks one particular response code. What I would really like to do is set the IsSuccessfulStatusCode to false instead. So something like this:
```
var response = new HttpResponseMessage
{
    IsSuccessStatusCode = false // cannot do this, as IsSuccessStatusCode is readonly
};
```
I have tried extending the HttpResponseMessage (named FakeHttpResponseMessage), creating an instance of that class and setting the IsSuccessStatusCode property to true, and then setup the mock to return that instead, but the IsSuccessStatusCode property evaluates to true when running the test, so it didn't have the desired effect.

How can this be achieved, without having to test each and every possible unsuccessful HttpStatusCode?

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