Graph::ListGroups API call fails with a JSON unmarshaling error

[nmiodice]

The Graph API implementation for ListGroups consistently fails with a JSON unmarshaling error.

Steps to reproduce:

... initialize client
_, err := client.ListGroups(clients.ctx, graph.ListGroupsArgs{})

In my project, I need to call the API like this, which also fails:

client.ListGroups(clients.ctx, graph.ListGroupsArgs{
		ScopeDescriptor: &projectDescriptor,
		ContinuationToken: continuationToken,
})

After a brief look into the code, my initial hunch is that, possibly, the unmarshal code being called is UnmarshalBody, where it may need to be UnmarshalCollectionBody

The response in browser looks like this

{
  "count": 10,
  "value": [
    ...
  ]
}

[tiwood]

I've just hit the same issue with Graph::ListUsers.
This may affect all List methods probably?

[tedchamb]

Fixed in PR #31