public void LoadChapterWithTestsAsyncShouldLoadTheChapterItsExercisesAndItsTests()
{
//Arrange
var existingPeriod = new Period();
var courseCode = Guid.NewGuid().ToString();
var existingChapter = new ChapterBuilder().WithId()
.WithCourse(courseCode)
.WithPeriod(existingPeriod).Build();
_periodRepositoryMock.Setup(repo => repo.GetCurrentPeriodAsync()).ReturnsAsync(existingPeriod);
_chapterRepositoryMock.Setup(repo => repo.LoadWithExercisesAndTestsAsync(It.IsAny <int>(), It.IsAny <int>(), It.IsAny <int>()))
.ReturnsAsync(existingChapter);
//Act
var result = _service.LoadChapterWithTestsAsync(existingChapter.CourseId, existingChapter.Number).Result;
//Assert
_periodRepositoryMock.Verify(repo => repo.GetCurrentPeriodAsync(), Times.Once);
_chapterRepositoryMock.Verify();
_chapterRepositoryMock.Verify(repo => repo.LoadWithExercisesAndTestsAsync(existingChapter.CourseId, existingChapter.Number, existingPeriod.Id), Times.Once);
Assert.That(result, Is.EqualTo(existingChapter));
}