public void Validate_WhenCalled_AssertShouldBeGreaterThanOrEqualToZeroWasCalledOnDecimalValidatorWithExpenses() { decimal expenses = _fixture.Create <short>(); IBudgetInfoCommand sut = CreateSut(expenses: expenses); sut.Validate(_validatorMockContext.ValidatorMock.Object); _validatorMockContext.DecimalValidatorMock.Verify(m => m.ShouldBeGreaterThanOrEqualToZero( It.Is <decimal>(value => value == expenses), It.Is <Type>(type => type == sut.GetType()), It.Is <string>(field => string.CompareOrdinal(field, "Expenses") == 0)), Times.Once()); }