public async Task ParkService_GetAllParks_ReturnsFullList() { var underTest = new ParkService(_parkRepositoryMock.Object); underTest.Should().NotBeNull("because we expect an instance to be created."); var result = await underTest.GetAllParks() as IList <Park>; result.Should().NotBeNull("because we expect a result."); result.Should().HaveCount(DummyParks.Count(), "because the returned count should match DummyParks count."); }