.net core - How to unit test ActionFilterAttribute -


i'm looking test actionfilterattribute in .net core 2.0 api project , wondering best way go it. note, i'm not trying test through controller action, merely test actionfilterattribute itself.

how might go testing this:

    public class validatemodelattribute : actionfilterattribute     {         public override void onactionexecuting(actionexecutingcontext context)         {             if (!context.modelstate.isvalid)             {                 context.result = new badrequestobjectresult(context.modelstate);             }         }     }

create instance of context pass filter , assert expected behavior

for example

[testclass] public class validatemodelattributetest {     [testmethod]     public void invalid_modelstate_should_return_badrequestobjectresult() {         //arrange         var httpcontext = new defaulthttpcontext();         var context = new actionexecutingcontext(             new actioncontext             {                 httpcontext = httpcontext,                 routedata = new routedata(),                 actiondescriptor = new actiondescriptor(),             },             new list<ifiltermetadata>(),             new dictionary<string, object>(),             new mock<controller>().object);          var sut = new validatemodelattribute();          //act         sut.onactionexecuting(context);          //assert         context.result.should().notbenull()             .and.beoftype<badrequestobjectresult>();     } }

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