correct rootValue in alias test

[tranvansang]

No description provided.

[clentfort]

Thanks for the PR. I'm a bit worried. Why does this test currently pass? Could you explain how you found this?

[tranvansang]

Why does this test currently pass?

I think the current test only asserts the number of calls to the converter.
It passed regardless of whatever the data is.

Could you explain how you found this?

I tried integrating your implementation into my (unpublished, urql-like) library, I iterated through all your test cases with an addition assertion of the returned result and found the mistake.

Eventually, I found that the current top-down approach (checking the type from the leaf element of the AST) in your lib cannot cover all the cases. Specifically when the tree has recursive fragments.

Currently, I am stopping my own implementation and might investigate an entirely new (bottom-up) implementation somewhere in the future.