public async Task GetBusinessUnits_WhenBusinessUnitsExist_ShouldReturnAllBusinessUnits() { //Arrange var businessUnits = new List <string> { "bu1", "bu2" }; _enrollmentProcessorMock.Setup(p => p.GetBusinessUnits()).ReturnsAsync(businessUnits); var controller = new EnrollmentController(_enrollmentProcessorMock.Object); //Act var response = await controller.GetBusinessUnits(); //Assert var okResult = Assert.IsType <OkObjectResult>(response); var returnValue = Assert.IsType <List <string> >(okResult.Value); Assert.NotEmpty(returnValue); }