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Q&A Test Extension Method Received Call with NSubstitute

How can I verify that an extension method was called when using NSubstitute for unit testing? For a normal method I'd do something like: substitutedClass.Recieved().CheckedMethod(...) But exten...

1 answer  ·  posted 5mo ago by rcmosher‭  ·  last activity 5mo ago by rcmosher‭

Question c# nsubstitute
#1: Initial revision by user avatar rcmosher‭ · 2024-07-15T15:10:36Z (5 months ago)
Test Extension Method Received Call with NSubstitute
How can I verify that an extension method was called when using NSubstitute for unit testing? For a normal method I'd do something like:

    substitutedClass.Recieved().CheckedMethod(...)

But extension methods are not actually substituted so I can't use them with `Received()` in this way. For example if you use an `ILogger` with `Microsoft.Extensions.Logging` and try to check a call to `LogWarning()` like so:

    logger.Received().LogWarning(Arg.Is<string>(s => s.Contains("special text")), Arg.Any<object?[]>());


you will get the following error since `LogWarning()` is an extension method:

    NSubstitute.Exceptions.RedundantArgumentMatcherException : Some argument specifications (e.g. Arg.Is, Arg.Any) were left over after the last call.
    
    This is often caused by using an argument spec with a call to a member NSubstitute does not handle (such as a non-virtual member or a call to an instance which is not a substitute), or for a purpose other than specifying a call (such as using an arg spec as a return value).

How can you test a call was received when an extension method was used?