bug 1465085: Tests for get_doc_components_from_url
bug 1465085: Tests for get_doc_components_from_url

Refactor the tests for get_doc_components_from_url to pytest style, and
expand the test cases.

a2sheppy/kuma,jwhitlock/kuma,SphinxKnight/kuma,Elchi3/kuma,SphinxKnight/kuma,a2sheppy/kuma,Elchi3/kuma,SphinxKnight/kuma,Elchi3/kuma,SphinxKnight/kuma,jwhitlock/kuma,escattone/kuma,jwhitlock/kuma,mozilla/kuma,a2sheppy/kuma,SphinxKnight/kuma,Elchi3/kuma,jwhitlock/kuma,mozilla/kuma,a2sheppy/kuma,mozilla/kuma,mozilla/kuma,jwhitlock/kuma,mozilla/kuma,Elchi3/kuma,escattone/kuma,escattone/kuma,a2sheppy/kuma,SphinxKnight/kuma