public void PostAcceptInviteAsync_ShouldReturnExpectedHttpStatusCodeOnKnownErrors(Exception exception, int expectedStatusCode)
{
_groupService.AcceptInviteAsync(_executionContext, Arg.Any <int>(), Arg.Any <int>())
.Returns(Task.FromException <GroupInvite>(exception));
Func <Task> act = () => _controller.PostAcceptInviteAsync(_executionContext, 8, 12);
act.Should().Throw <HttpErrorException>().Which.StatusCode.Should().Be(expectedStatusCode);
}