public async Task WhenUserNotInRole_ThenListNodeGroupsAsyncThrowsResourceAccessDeniedException(
[Credential(Role = PredefinedRole.IapTunnelUser)] ResourceTask <ICredential> credential)
{
var adapter = new ComputeEngineAdapter(await credential);
AssertEx.ThrowsAggregateException <ResourceAccessDeniedException>(
() => adapter.ListNodeGroupsAsync(
TestProject.ProjectId,
CancellationToken.None).Wait());
}