public async Task GetMembersAsync_ReturnsIEnumerableCityDTO() { // Arrange _repoWrapper.Setup(x => x.City.GetAllAsync(It.IsAny <Expression <Func <DataAccess.Entities.City, bool> > >(), It.IsAny <Func <IQueryable <DataAccess.Entities.City>, IIncludableQueryable <DataAccess.Entities.City, object> > >())) .ReturnsAsync(new List <DataAccess.Entities.City>()); _mapper.Setup(x => x.Map <IEnumerable <DataAccess.Entities.City>, IEnumerable <CityDTO> >(It.IsAny <IEnumerable <DataAccess.Entities.City> >())) .Returns(cities); // Act var result = await _regionService.GetMembersAsync(2); // Assert Assert.IsInstanceOf <IEnumerable <CityDTO> >(result); Assert.IsNotNull(result); }