public async Task CreateOrUpdateAtMgmtGroup()
{
//This test uses a pre-created management group.
ManagementGroup mgmtGroup = await GetCreatedManagementGroup();
string policyAssignmentName = Recording.GenerateAssetName("polAssign-");
PolicyAssignment policyAssignment = await CreatePolicyAssignment(mgmtGroup, policyAssignmentName);
Assert.AreEqual(policyAssignmentName, policyAssignment.Data.Name);
Assert.ThrowsAsync <ArgumentNullException>(async() => _ = await mgmtGroup.GetPolicyAssignments().CreateOrUpdateAsync(true, null, policyAssignment.Data));
Assert.ThrowsAsync <ArgumentNullException>(async() => _ = await mgmtGroup.GetPolicyAssignments().CreateOrUpdateAsync(true, policyAssignmentName, null));
}