public async Task GetBooksByAuthorAsync_BookNotFound_ThrowsException()
{
const int AUTHOR_ID = 1;
var authorNotFoundException = new HttpResponseException(HttpStatusCode.NOT_FOUND, "not found");
_authorModelMock
.Setup(x => x.ValidateExistingAuthorAsync(AUTHOR_ID))
.Throws(authorNotFoundException);
var ex = await Assert.ThrowsExceptionAsync <HttpResponseException>(async() => await _model.GetBooksByAuthorAsync(AUTHOR_ID));
Assert.AreEqual(authorNotFoundException.Message, ex.Message);
Assert.AreEqual(authorNotFoundException.StatusCode, ex.StatusCode);
}
