public async Task IsExistingMethod_ShouldReturnFalseIfFlightNotExists() { // Arrange var context = ApplicationDbContextInMemoryFactory.InitializeContext(); var seeder = new FlightsServiceTestsSeeder(); await seeder.SeedFlightAsync(context); var flightRepository = new EfDeletableEntityRepository <Flight>(context); var service = new FlightsService(flightRepository); // Act var actualResult = service.Exists("FlightId"); var expectedResult = false; // Assert Assert.True(actualResult == expectedResult); }