def METHOD_NAME(
    monkeypatch_plugin_test_packages: None, server: "Server"
) -> None:
    config_plugins = test_utils.read_workspace_file("workspace/builder/plugin_r.yaml")
    session_configig = ConfigReader._load(format="yaml", content=config_plugins)
    session_configig = loader.expand(session_configig)
    # open it detached
    builder = WorkspaceBuilder(
        session_config=session_configig,
        plugins=load_plugins(session_configig),
        server=server,
    )
    builder.build()
    with contextlib.suppress(libtmux.exc.LibTmuxException):
        _reattach(builder)
    assert builder.session is not None
    proc = builder.session.cmd("display-message", "-p", "'#S'")
    assert proc.stdout[0] == "'plugin_test_r'"