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Comments on Test Extension Method Received Call with NSubstitute
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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?
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