public void TestCredits()
{
// Using Moq for testing individual components. we can repeat this test
// for all other components.
var mockCredits = new Mock <IChecks>();
IRepository IRepository = new Repository.Repository();
List <Requirement> requirements = IRepository.GetRequirements();
List <Course> courses = GetCourseData();
mockCredits.Setup(credit => credit.CheckAllCreditsPassed(It.IsAny <List <Requirement> >(), It.IsAny <List <Course> >())).Returns(true);
IChecks check = new Checks();
bool result = check.CheckAllCreditsPassed(requirements, courses);
// There was a logical error to test passed or not. for example what happen if
// average is more than 50 but one or more mourses are less than 50?
// Here we make sure that each student has passed all credits.
Assert.IsTrue(result);
}