TestTasksDeserializer class not using FakePolicyEnforcer

[Brian Rosmaita]

This was uncovered by a patch implementing policy-in-code for Glance:
https://review.opendev.org/#/c/693129/

The TestTasksDeserializer class creates a glance.v2.tasks.RequestDeserializer but doesn't pass it a policy_enforcer. As a result, RequestDeserializer uses a real policy enforcer. The default policy in code that's checked by the RequestDeserializer is "tasks_api_access: role:admin", and with that policy in place, all the unit test requests fail. Need to pass the unit test class the FakePolicyEnforcer so that the deserialization can be tested.

[Brian Rosmaita (brian-rosmaita)]

This should be fixed whether or not the policy-in-code patch is accepted, we shouldn't be using the real policy engine in these tests.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/693952

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/693952
Committed: https://git.openstack.org/cgit/openstack/glance/commit/?id=7c85bdcf837da06463dbea0cd5171b1f5b3e726d
Submitter: Zuul
Branch: master

commit 7c85bdcf837da06463dbea0cd5171b1f5b3e726d
Author: Brian Rosmaita <email address hidden>
Date: Tue Nov 12 18:58:23 2019 -0500

    Use FakePolicyEnforcer for deserialization tests

    The tasks unit tests that test the RequestDeserializer
    are using the real policy engine. They should be using
    a mock because we're testing the deserialization, not the
    policies.

    Closes-bug: #1852354

    Change-Id: I35bdacd154b2c8d18ce268a5e6e8aba710e41108

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/glance 20.0.0.0b1 development milestone.