verify-set.cs

[Fact]
public void CustomerCheckShouldUpdateIsAppliedProperty()
{
    //Arrange
    var mockValidator = new Mock<IValidator>();
    mockValidator.Setup(x => x.Customer.IsValid).Returns(true);
    var sut = new CreditApplicationEvaluator(mockValidator.Object);
    var application = new CreditApplication { GrossAnnualIncome = 99_000 };
    
    //Act
    sut.Evaluate(application);

    //Assert
    mockValidator.VerifySet(x => x.IsApplied, Times.Once);
}