c# - Mocking out a method that takes optional parameters that default to null -


i writing unit test against function hits elasticsearch through nest. unit test's setup looks this:

var mockresponse = new mock<ibulkresponse>(); var mockclient = new mock<ielasticclient>(); mockclient.setup(x => x.indexmanyasync<store>(it.isany<ienumerable<store>>(), it.isany<string>(), it.isany<string>())).returns(task<ibulkresponse>.run(() => mockresponse.object));

the indexmanyasync function takes has function signature of task<ibulkresponse> indexmanyasync<t>(ienumerable<t> object, string index = null, string type = null).

as can see, tried set mock ielasticclient mock out method above, following exception:

an exception of type 'system.notsupportedexception' occurred in moq.dll not handled in user code  additional information: expression references method not belong mocked object: x => x.indexmanyasync<store>(it.isany<ienumerable`1>(), it.isany<string>(), it.isany<string>())

it's not clear me going on here. why unable mock method takes optional parameters?

it appears particular overload of indexmanyasync is extension method:

public static task<ibulkresponse> indexmanyasync<t>(this ielasticclient client,                                                      ienumerable<t> objects,                                                      string index = null,                                                      string type = null) t : class {     // <snip> }

you cannot use moq mock extension methods.


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