src/buildstream/_testing/_sourcetests/mirror.py [113:128]:
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    element_name = "test.bst"
    element_path = os.path.join(element_dir, element_name)
    full_repo = element["sources"][0]["url"]
    _, repo_name = os.path.split(full_repo)
    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",
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src/buildstream/_testing/_sourcetests/mirror.py [265:280]:
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    element_name = "test.bst"
    element_path = os.path.join(element_dir, element_name)
    full_repo = element["sources"][0]["url"]
    _, repo_name = os.path.split(full_repo)
    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",
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