public void Calculate_LoanAmountDue_Should_Return_BadRequest_ForMalformed_Request()
{
var serviceCollection = CreateServiceProvider();
var loanCalculatorService = serviceCollection.GetRequiredService <ILoanCalculatorService>();
var controller = new LoanCalculatorController(loanCalculatorService);
var actionResult = controller.CalculateLoanAmountDue((CustomerType)4, 100, 1);
actionResult.Should().BeBadRequestObjectResult().ErrorAs <string>();
}
[Fact] public void Calculate_LoanAmountDue_Should_Return_BadRequest_ForNegative_Values()
{
var serviceCollection = CreateServiceProvider();
var loanCalculatorService = serviceCollection.GetRequiredService <ILoanCalculatorService>();
var controller = new LoanCalculatorController(loanCalculatorService);
var result = controller.CalculateLoanAmountDue(CustomerType.Business, -1, -1);
result.Should().BeBadRequestObjectResult().ErrorAs <string>();
}
[Fact] public void Calculate_LoanAmountDue_Should_Return_Ok_With_Valid_Payload()
{
var serviceCollection = CreateServiceProvider();
var loanCalculatorService = serviceCollection.GetRequiredService <ILoanCalculatorService>();
var controller = new LoanCalculatorController(loanCalculatorService);
var actionResult = controller.CalculateLoanAmountDue(CustomerType.Individual, 50001, 1);
var expected = new { amountDue = 56376.13m, interest = 6375.13m };
actionResult.Should().BeOkObjectResult().Value.Should().BeEquivalentTo(expected);
}
