public async Task GetExam_WithExamId_ReturnsExistingExam()
{
//Arrange
var examId = AutoFaker.Generate <int>();
var exam = AutoFaker.Generate <Exam>();
var examDto = AutoFaker.Generate <ExamDto>();
_examService.Setup(x => x.GetExamById(It.IsAny <int>()))
.ReturnsAsync(exam);
_mapper.Setup(x => x.Map <ExamDto>(exam))
.Returns(examDto);
//Act
var result = await _sut.GetExam(examId);
//Assert
result.Should().BeOfType <OkObjectResult>();
((OkObjectResult)result).StatusCode.Should().Be(StatusCodes.Status200OK);
((OkObjectResult)result).Value.Should().BeEquivalentTo(examDto);
}