Assign values of the arguments to variable using moq

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unit-testing

C#6.0

In moq setup I am trying to assign the value of one of the argument to a string variable. Although I used callback but still the variable seems to have null value.

What I have tried:

I tried this

Mock<ILunaService> partialMockLunaService = new Mock<ILunaService>(MockBehavior.Strict);
            partialMockLunaService.Setup(x => x.TranslateText(It.IsAny<MachineTranslationProviderEnum>(), It.IsAny<int>(), It.IsAny<int>(), It.IsAny<string>(), It.IsAny<MachineTranslationOptionsDto>()))
                .Callback<MachineTranslationProviderEnum, int, int, string, MachineTranslationOptionsDto>((a, b, c, d, e) => actualTextForTranslation = d);