Test-driver failed due to an ion-python incompatible issue

[cheqianh]

Test driver failed after upgrading python and ion-python version.

It's not because of test-driver itself or any files fails the tests. From the log,

amazon.ion.exceptions.IonException: IERR_INVALID_ARG assertion failed: len == 1

It's because test-driver's use case (maybe --equiv mode?) is incompatible with ion-python 0.9.x. Need more investigation.

Example workflow,
ion-java - https://github.com/amzn/ion-java/actions/runs/3039157212/jobs/4893762191
ion-js - https://github.com/amzn/ion-js/actions/runs/2000741133/jobs/2872821385

[cheqianh]

Downgraded ion-python version (2fdac20) unblock the pipeline and here is a successful workflow run - https://github.com/amzn/ion-java/actions/runs/3325129408/jobs/5497475141

Refer to amazon-ion/ion-python#218 for further investigation why ion-test-driver cannot work with C extension.