public async void ReturnsAnEnumerableOfRiverWithStateCode()
        {
            MockRiverRepo.Setup(m => m.GetRiversByState(It.IsAny <string>())).ReturnsAsync(new List <River>());
            var vals = await service.GetRivers("MD");

            Assert.IsType <List <River> >(vals);
        }
        public async void ReturnsAnEnumerableOfRiversWithEmptyString()
        {
            MockRiverRepo.Setup(m => m.GetRivers()).Returns(new List <River>());
            var vals = await service.GetRivers(string.Empty);

            Assert.IsType <List <River> >(vals);
        }
        public async void ReturnAnEnumerableOfRiverWithPartialName()
        {
            MockRiverRepo.Setup(m => m.GetRiversAsync(It.IsAny <string>())).ReturnsAsync(new List <River>());
            var vals = await service.GetRivers("gaul");

            Assert.IsType <List <River> >(vals);
        }