public void should_Get() { // Arrange Assert.That(_testLookups, Is.Not.Empty); List <int> ids = _testLookups.Select(x => x.Id).ToList(); var controller = new LookupController(_LookupService); // Act var lookups = controller.Get().Where(x => ids.Contains(x.Id)); // Assert Assert.That(lookups, Is.Not.Empty); foreach (var lookup in lookups) { Debug.Print(lookup.ToString()); } }