c# - How to mock OwinContext.Request.Query -

i trying unit test method checks query in owincontext.request.query , alters it

public static async task setupquery(iowincontext context, iclientstore clientconfig) {     // clientid querystring     var clientidqs = context.request.query.where(x => x.key == constants.authorizerequest.clientid).select(x => x.value).firstordefault();     // more code here } 

i using moq mock context. how mock query object of type ireadablestringcollection

if take closer @ ireadablestringcollection, see inherits ienumerable<keyvaluepair<string,string[]>. other class/interface know inherits similar. idictionary<tkey,tvalue>.

so set out find way mock ienumerable<keyvaluepair<string,string[]>. take @ following extension method

public static class mockqueryableextensions {     /// <summary>     /// converts generic <seealso cref="system.collections.generic.ienumerable&lt;t&gt;"/>  <see cref="moq.mock"/> implementation of quarable list      /// </summary>     public static mock<t> asquaryablemock<t, titem>(this mock<t> quaryablemock, ienumerable<titem> list)         t : class,ienumerable<titem> {          var queryablelist = list.asqueryable();          quaryablemock.as<iqueryable<titem>>().setup(x => x.provider).returns(queryablelist.provider);         quaryablemock.as<iqueryable<titem>>().setup(x => x.expression).returns(queryablelist.expression);         quaryablemock.as<iqueryable<titem>>().setup(x => x.elementtype).returns(queryablelist.elementtype);         quaryablemock.as<iqueryable<titem>>().setup(x => x.getenumerator()).returns(queryablelist.getenumerator());          return quaryablemock;     } } 

with done left make sure create fake data, store in dictionary , set on mock of ireadablestringcollection

[testclass] public class owincontexttests {     [testmethod]     public void mock_owincontext_request_query_should_be_queryable() {         //arrange         var collection = new dictionary<string, string[]>() {             {"a", new[]{"1", "2", "3"} },             {"b", new[]{"4", "5", "6"} }         };         //applying extension method         var querymock = new mock<ireadablestringcollection>().asquaryablemock(collection);          var requestmock = mock.create<iowinrequest>();          requestmock.setup(m => m.query).returns(querymock.object);          var contextmock = mock.create<iowincontext>();         contextmock.setup(m => m.request).returns(requestmock.object);          var key = "b";         var expected = collection[key];          //act         var actual = setupquery(contextmock.object, key);          //assert         assert.isnotnull(actual);         collectionassert.areequal(expected, actual);      }      public static string[] setupquery(iowincontext context, string key) {         // values querystring         var values = context.request.query.where(x => x.key == key).select(x => x.value).firstordefault();         return values;     }  } 

the above test passes linq query called on context request query works fake data provided.