public void SignupCourse_ThrowsException_When_Course_IsNull([Frozen] Mock <ICourseRepository> repository,
CourseSignupCommand command,
CoursesCommandService sut)
{
// Arrange
repository.Setup(o => o.GetCourse(command.CourseId)).Returns <Course>(null);
// Act
Action act = () => sut.SignupCourse(command).GetAwaiter().GetResult();
// Assert
act.Should().Throw <Exception>($"because course is null").And.Message.Contains("Course not found");
}
public async void SignupCourse_Success([Frozen] Mock <ICourseRepository> repository,
CourseSignupCommand command,
Course course,
User user,
CoursesCommandService sut)
{
// Arrange
repository.Setup(o => o.GetCourse(command.CourseId)).ReturnsAsync(course);
repository.Setup(o => o.GetUser(command.InputData.StudentId)).ReturnsAsync(user);
int preSignUpUserCount = course.UserCourses.Count;
// Act
SignupCourseResponse result = await sut.SignupCourse(command);
// Assert
int postSignUpUserCount = course.UserCourses.Count;
postSignUpUserCount.Should().Be(preSignUpUserCount + 1, "because user is added to the course");
result.Success.Should().BeTrue("because result is success");
}
