How to add context when ASP. net mvc unit test Controller

In ASP. when testing the Controller in net MVC, you often need to access the context in the controller, for example, querying the content in a string or form. However, when testing, it is generally not in the Web runtime environment, so we need to do some work to simulate the context.

ControllerCodeAs follows:

 

  PublicActionresult index ()
{
Viewdata ["Message"]=Request. querystring ["Linear Filter"];

ReturnView ();
}
 

 

 

The test syntax is as follows:

 

Code

  [Testmethod]
  Public     Void  Index ()
{
Homecontroller Controller  =     New  Homecontroller ();

VaR httpcontext  =     New  Mock <  Httpcontextbase  >  ();
VaR request  =  New  Mock  <  Httprequestbase  >  ();
Namevaluecollection querystring  =     New  Namevaluecollection ();
Querystring. Add ( "  Linear Filter  "  ,  "  Linear Filter  "  );
Request. Setup (R  =>  R. querystring). Returns (querystring );
Httpcontext. Setup (HT  =>  Ht. Request). Returns (request. Object );

Controllercontext  =     New Controllercontext ();
Controllercontext. httpcontext  =  Httpcontext. object;
Controller. controllercontext  =  Controllercontext;

Viewresult result  =  Controller. Index ()  As  Viewresult;

Viewdatadictionary viewdata  =  Result. viewdata;
Assert. areequal (  "  Linear Filter "  , Viewdata [  "  Message  "  ]);
} 

 

Mock is used here for reference:

Moq (Mock framework based on. net3.5, C #3.0)

If it is form, just make a slight modification:

 

   PublicActionresult about ()
{
Viewdata ["Message"]=Request. Form ["Linear Filter"];
ReturnView ();
}
 

 

 

Test code:

 

Code

  [Testmethod]
  Public     Void  About ()
{
  //  Arrange  
  Homecontroller Controller  =     New Homecontroller ();
VaR httpcontext  =     New  Mock  <  Httpcontextbase  >  ();
VaR request  =     New  Mock  <  Httprequestbase  > ();
Namevaluecollection querystring  =     New  Namevaluecollection ();
Querystring. Add (  "  Linear Filter  "  ,  "  Linear Filter  "  );
Request. Setup (R  =>  R. Form). Returns (querystring );
Httpcontext. Setup (HT =>  Ht. Request). Returns (request. Object );

Controllercontext  =     New  Controllercontext ();
Controllercontext. httpcontext  =  Httpcontext. object;
Controller. controllercontext  =  Controllercontext;
  //  Act  
 Viewresult result  =  Controller. About ()  As  Viewresult;

  //  Assert  
  Viewdatadictionary viewdata  =  Result. viewdata;
Assert. areequal (  "  Linear Filter  "  , Viewdata [ "  Message  "  ]);
}