public void EntityExists_ExistingEntity_ShouldReturnTrue()
{
// Arrange
int id = testRatings.First().Id;
dbSetRatingMock
.Setup(ds => ds.Find(It.IsAny <int>()))
.Returns(FindRating(id));
// Act
var exists = repo.EntityExists(id);
// Assert
exists.Should().BeTrue();
}
