src/buildstream/_testing/_sourcetests/mirror.py [214:230]:
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    alias = "foo-" + kind
    aliased_repo = alias + ":" + repo_name
    element["sources"][0]["url"] = aliased_repo
    full_mirror = mirror_repo.source_config()["url"]
    mirror_map, _ = os.path.split(full_mirror)
    _yaml.roundtrip_dump(element, element_path)

    _set_project_mirrors_and_aliases(
        project_dir,
        [
            {
                "name": "middle-earth",
                "aliases": {
                    alias: [mirror_map + "/"],
                },
            },
        ],
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src/buildstream/_testing/_sourcetests/mirror.py [269:285]:
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    alias = "foo-" + kind
    aliased_repo = alias + ":" + repo_name
    element["sources"][0]["url"] = aliased_repo
    full_mirror = mirror_repo.source_config()["url"]
    mirror_map, _ = os.path.split(full_mirror)
    _yaml.roundtrip_dump(element, element_path)

    _set_project_mirrors_and_aliases(
        project_dir,
        [
            {
                "name": "middle-earth",
                "aliases": {
                    alias: [mirror_map + "/"],
                },
            },
        ],
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