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How to Mock IUrlHelper

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0

1

Getting started with Unit Tests can be frustrating, getting stuck at every detail. Hope this will improve as I gain more experience.

Now, how do I mock IUrlHelper for unit test?

I have this simple method to get absolute paths in ASP.NET

public static string AbsolutePage(this IUrlHelper url, string pageName, string pageHandler = null, object routeValues = null)

 return url.Page(pageName, pageHandler, routeValues, url.ActionContext.HttpContext.Request.Scheme);

Mocking the Scheme is easy

return Mock.Of<IUrlHelper>(x =>
 x.ActionContext.HttpContext.Request.Scheme == "http");

but then the method calls the Page method on the IUrlHelper. What do I do now?

I'd be tempted to skip small frustrating tests like this, but I think it's important to be vigorous when first learning.

c# .net asp.net-mvc unit-testing asp.net-core

share|improve this question

edited Mar 25 at 14:49

Johnny

4,84811 gold badge1010 silver badges2222 bronze badges

asked Mar 25 at 14:15

Etienne CharlandEtienne Charland

66811 gold badge44 silver badges2323 bronze badges

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  actually, it's important to focus on what is important to test. you don't have to test and mock everything. Focus on the basics, get those right, then everything will fall into place. Test your own functionality, not frameworks
  
  – Andrei Dragotoniu
  Mar 25 at 14:20
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @AndreiDragotoniu: is right. You're mostly testing the framework here. Extensions are very difficult to unit test, so the general idea is that they should be kept minimal and mostly just proxy to code that can/is thoroughly tested. Here, the only thing that could possibly go wrong is if you literally passed the parameters wrong to url.Page, which is mostly covered by compile-time checking. In short, there's no real need to test this method at all.
  
  – Chris Pratt
  Mar 25 at 14:38
  

  
  
  
  

add a comment | 

0

1

Getting started with Unit Tests can be frustrating, getting stuck at every detail. Hope this will improve as I gain more experience.

Now, how do I mock IUrlHelper for unit test?

I have this simple method to get absolute paths in ASP.NET

public static string AbsolutePage(this IUrlHelper url, string pageName, string pageHandler = null, object routeValues = null)

 return url.Page(pageName, pageHandler, routeValues, url.ActionContext.HttpContext.Request.Scheme);

Mocking the Scheme is easy

return Mock.Of<IUrlHelper>(x =>
 x.ActionContext.HttpContext.Request.Scheme == "http");

but then the method calls the Page method on the IUrlHelper. What do I do now?

I'd be tempted to skip small frustrating tests like this, but I think it's important to be vigorous when first learning.

c# .net asp.net-mvc unit-testing asp.net-core

share|improve this question

edited Mar 25 at 14:49

Johnny

4,84811 gold badge1010 silver badges2222 bronze badges

asked Mar 25 at 14:15

Etienne CharlandEtienne Charland

66811 gold badge44 silver badges2323 bronze badges

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  actually, it's important to focus on what is important to test. you don't have to test and mock everything. Focus on the basics, get those right, then everything will fall into place. Test your own functionality, not frameworks
  
  – Andrei Dragotoniu
  Mar 25 at 14:20
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  
  @AndreiDragotoniu: is right. You're mostly testing the framework here. Extensions are very difficult to unit test, so the general idea is that they should be kept minimal and mostly just proxy to code that can/is thoroughly tested. Here, the only thing that could possibly go wrong is if you literally passed the parameters wrong to url.Page, which is mostly covered by compile-time checking. In short, there's no real need to test this method at all.
  
  – Chris Pratt
  Mar 25 at 14:38
  

  
  
  
  

add a comment | 

Getting started with Unit Tests can be frustrating, getting stuck at every detail. Hope this will improve as I gain more experience.

Now, how do I mock IUrlHelper for unit test?

I have this simple method to get absolute paths in ASP.NET

public static string AbsolutePage(this IUrlHelper url, string pageName, string pageHandler = null, object routeValues = null)

 return url.Page(pageName, pageHandler, routeValues, url.ActionContext.HttpContext.Request.Scheme);

Mocking the Scheme is easy

return Mock.Of<IUrlHelper>(x =>
 x.ActionContext.HttpContext.Request.Scheme == "http");

but then the method calls the Page method on the IUrlHelper. What do I do now?

I'd be tempted to skip small frustrating tests like this, but I think it's important to be vigorous when first learning.

c# .net asp.net-mvc unit-testing asp.net-core

share|improve this question

edited Mar 25 at 14:49

Johnny

4,84811 gold badge1010 silver badges2222 bronze badges

asked Mar 25 at 14:15

Etienne CharlandEtienne Charland

66811 gold badge44 silver badges2323 bronze badges

public static string AbsolutePage(this IUrlHelper url, string pageName, string pageHandler = null, object routeValues = null)

 return url.Page(pageName, pageHandler, routeValues, url.ActionContext.HttpContext.Request.Scheme);

return Mock.Of<IUrlHelper>(x =>
 x.ActionContext.HttpContext.Request.Scheme == "http");

share|improve this question

edited Mar 25 at 14:49

Johnny

4,84811 gold badge1010 silver badges2222 bronze badges

asked Mar 25 at 14:15

Etienne CharlandEtienne Charland

66811 gold badge44 silver badges2323 bronze badges

share|improve this question

edited Mar 25 at 14:49

Johnny

4,84811 gold badge1010 silver badges2222 bronze badges

asked Mar 25 at 14:15

Etienne CharlandEtienne Charland

66811 gold badge44 silver badges2323 bronze badges

edited Mar 25 at 14:49

Johnny

4,84811 gold badge1010 silver badges2222 bronze badges

edited Mar 25 at 14:49

Johnny

4,84811 gold badge1010 silver badges2222 bronze badges

asked Mar 25 at 14:15

Etienne CharlandEtienne Charland

66811 gold badge44 silver badges2323 bronze badges

asked Mar 25 at 14:15

Etienne CharlandEtienne Charland

66811 gold badge44 silver badges2323 bronze badges

1 Answer
1

active

oldest

votes

-1

If you still want to test your IUrlHelper you may use this code

var mocked = new Mock<IUrlHelper>();

mocked.Setup(x => x.Page(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<object>(), It.IsAny<string>()))
 .Returns("whatever_string");

IUrlHelper helper = mocked.Object;

share|improve this answer

answered Mar 25 at 14:38

xnegxneg

46144 silver badges1212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ya. That would test that Page gets called; but not that it's generating the expected absolute URLs in a variety of scenarios, so the test would be of limited use really. And since the inner-working of the function is a bit complex, I can't say it works until I run it. And the fact that it uses the UrlHelper to generate the absolute URLs is an internal matter that ideally the test wouldn't care about -- as long as it provides the expected result.
  
  – Etienne Charland
  Mar 25 at 15:02
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I found back this post after bumping into the same issue again. Page is an extension method in UrlHelperExtensions and not a member of IUrlHelper, thus it can't be mocked in that way.
  
  – Etienne Charland
  May 13 at 5:23
  

  
  
  
  

add a comment | 

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-1

If you still want to test your IUrlHelper you may use this code

var mocked = new Mock<IUrlHelper>();

mocked.Setup(x => x.Page(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<object>(), It.IsAny<string>()))
 .Returns("whatever_string");

IUrlHelper helper = mocked.Object;

share|improve this answer

answered Mar 25 at 14:38

xnegxneg

46144 silver badges1212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ya. That would test that Page gets called; but not that it's generating the expected absolute URLs in a variety of scenarios, so the test would be of limited use really. And since the inner-working of the function is a bit complex, I can't say it works until I run it. And the fact that it uses the UrlHelper to generate the absolute URLs is an internal matter that ideally the test wouldn't care about -- as long as it provides the expected result.
  
  – Etienne Charland
  Mar 25 at 15:02
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I found back this post after bumping into the same issue again. Page is an extension method in UrlHelperExtensions and not a member of IUrlHelper, thus it can't be mocked in that way.
  
  – Etienne Charland
  May 13 at 5:23
  

  
  
  
  

add a comment | 

-1

If you still want to test your IUrlHelper you may use this code

var mocked = new Mock<IUrlHelper>();

mocked.Setup(x => x.Page(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<object>(), It.IsAny<string>()))
 .Returns("whatever_string");

IUrlHelper helper = mocked.Object;

share|improve this answer

answered Mar 25 at 14:38

xnegxneg

46144 silver badges1212 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Ya. That would test that Page gets called; but not that it's generating the expected absolute URLs in a variety of scenarios, so the test would be of limited use really. And since the inner-working of the function is a bit complex, I can't say it works until I run it. And the fact that it uses the UrlHelper to generate the absolute URLs is an internal matter that ideally the test wouldn't care about -- as long as it provides the expected result.
  
  – Etienne Charland
  Mar 25 at 15:02
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I found back this post after bumping into the same issue again. Page is an extension method in UrlHelperExtensions and not a member of IUrlHelper, thus it can't be mocked in that way.
  
  – Etienne Charland
  May 13 at 5:23
  

  
  
  
  

add a comment | 

If you still want to test your IUrlHelper you may use this code

var mocked = new Mock<IUrlHelper>();

mocked.Setup(x => x.Page(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<object>(), It.IsAny<string>()))
 .Returns("whatever_string");

IUrlHelper helper = mocked.Object;

share|improve this answer

answered Mar 25 at 14:38

xnegxneg

46144 silver badges1212 bronze badges

var mocked = new Mock<IUrlHelper>();

mocked.Setup(x => x.Page(It.IsAny<string>(), It.IsAny<string>(), It.IsAny<object>(), It.IsAny<string>()))
 .Returns("whatever_string");

IUrlHelper helper = mocked.Object;

share|improve this answer

answered Mar 25 at 14:38

xnegxneg

46144 silver badges1212 bronze badges

answered Mar 25 at 14:38

xnegxneg

46144 silver badges1212 bronze badges

answered Mar 25 at 14:38

xnegxneg

46144 silver badges1212 bronze badges