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Generic methods
Generic methods require type parameters to be specified to be invoked. When dealing with dependencies exposing generic methods, developers can use Moq to configure these methods accordingly by placing constraints on the incoming type parameters.
The snippets in this section will be based on the interface below:
public interface IService
{
void DoSomething<T>(T argument);
}
Like for configuring methods by accepting any parameters, methods can be configured to accept any type. This can be done with the constant
It.IsAnyType.mock.Setup(p => p.DoSomething(It.IsAny<It.IsAnyType>()))
.Callback((object value) => TestContext.Progress.Writeline($"DoSomething: {value}"));
Sometimes, the configuration needs to be more specific than what is allowed from the compiler. In this case, developers can use
It.IsSubType<T> to constrain the incoming type to the same type or any of its subtypes. This allows different setups for different incoming typesmock.Setup(p => p.DoSomething(It.IsAny<It.IsSubtype<IList<string>>>()))
.Callback((IList<string> items) => TestContext.Progress.Writeline($"Received list of {items.Count} strings"));
mock.Setup(p => p.DoSomething(It.IsAny<It.IsSubtype<IList<int>>>()))
.Throws<ArgumentException>();
Last modified 3yr ago