public async Task GetRoleId_NotFound() { // Arrange string rolesCsv = "A,B,C"; int expected = -1; _mockRolesService.GetRoleIdAsync(rolesCsv).Returns(expected); // Act ActionResult <int> response = await _sut.GetRoleId(rolesCsv); // Assert await _mockRolesService.Received(1).GetRoleIdAsync(rolesCsv); Assert.IsType <NotFoundResult>(response.Result); }