Pulp to pulp sync test for kickstarts

[pulpbot]

Author: @fao89 (fao89)

Redmine Issue: 6345, https://pulp.plan.io/issues/6345

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Currently, we don't have a good fixture for testing kickstarts: https://repos.fedorapeople.org/pulp/pulp/fixtures/rpm-kickstart/ As it does not have content in its sub-repositories

Options:

• create a better fixture
• write on performance tests with real repos

Goal: Currently, the tests are just checking the added contents for the main repo, we should test the sub-repos also

[pulpbot]

From: @fao89 (fao89) Date: 2020-03-16T17:50:27Z

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Problem: for now, it is not possible to list sub_repos: https://github.com/pulp/pulp_rpm/blob/master/pulp_rpm/app/viewsets.py#L110

[pulpbot]

From: @fao89 (fao89) Date: 2020-03-17T13:20:21Z

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also test if we can reach repomd.xml from sub-repos by their paths which would be (variant_uid/addon_uid)