示例#1
0
def test_split_relative_path(tmp_path, keep_cwd: pathlib.Path,
                             simplified_nist_catalog: oscatalog.Catalog,
                             monkeypatch: MonkeyPatch) -> None:
    """Test split with relative path."""
    # prepare trestle project dir with the file
    cat_name = 'mycat'
    trestle_root = test_utils.create_trestle_project_with_model(
        tmp_path, simplified_nist_catalog, cat_name, monkeypatch)

    orig_model: oscatalog.Catalog = simplified_nist_catalog

    os.chdir(trestle_root)
    catalog_dir = trestle_root / 'catalogs' / cat_name
    catalog_file: pathlib.Path = catalog_dir / 'catalog.json'

    args = argparse.Namespace(file='catalogs/mycat/catalog.json',
                              element='catalog.metadata',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0

    # merge receives an element path not a file path
    # so need to chdir to where the file is
    os.chdir(catalog_dir)
    args = argparse.Namespace(element='catalog.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert MergeCmd()._run(args) == 0

    new_model: oscatalog.Catalog = oscatalog.Catalog.oscal_read(catalog_file)
    assert test_utils.models_are_equivalent(orig_model, new_model)
示例#2
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def test_merge_everything_into_catalog_with_hidden_files_in_folders(
        testdata_dir, tmp_trestle_dir):
    """Test trestle merge -e 'catalog.*' when metadata and catalog are split and hidden files are present."""
    # Assume we are running a command like below
    # trestle merge -e catalog.*
    content_type = FileContentType.JSON
    fext = FileContentType.to_file_extension(content_type)

    # prepare trestle project dir with the file
    test_utils.ensure_trestle_config_dir(tmp_trestle_dir)

    test_data_source = testdata_dir / 'split_merge/step4_split_groups_array/catalogs'
    catalogs_dir = Path('catalogs/')
    mycatalog_dir = catalogs_dir / 'mycatalog'

    # Copy files from test/data/split_merge/step4
    shutil.rmtree(catalogs_dir)
    shutil.copytree(test_data_source, catalogs_dir)

    # Change directory to mycatalog_dir
    os.chdir(mycatalog_dir)
    catalog_file = Path(f'catalog{fext}').resolve()

    assert catalog_file.exists()

    # Read files

    # Create hand-crafter merge plan
    expected_plan: Plan = Plan()

    reset_destination_action = CreatePathAction(catalog_file,
                                                clear_content=True)
    expected_plan.add_action(reset_destination_action)

    _, _, merged_catalog_instance = ModelUtils.load_distributed(
        catalog_file, tmp_trestle_dir)

    element = Element(merged_catalog_instance)
    write_destination_action = WriteFileAction(catalog_file,
                                               element,
                                               content_type=content_type)
    expected_plan.add_action(write_destination_action)
    delete_element_action = RemovePathAction(Path('catalog').resolve())
    expected_plan.add_action(delete_element_action)

    test_utils.make_hidden_file(tmp_trestle_dir /
                                'catalogs/mycatalog/.DS_Store')
    test_utils.make_hidden_file(tmp_trestle_dir /
                                'catalogs/mycatalog/catalog/.DS_Store')
    test_utils.make_hidden_file(
        tmp_trestle_dir / 'catalogs/mycatalog/catalog/metadata/.DS_Store')
    test_utils.make_hidden_file(tmp_trestle_dir /
                                'catalogs/mycatalog/catalog/groups/.DS_Store')

    # Call merge()
    generated_plan = MergeCmd.merge(Path.cwd(), ElementPath('catalog.*'),
                                    tmp_trestle_dir)

    # Assert the generated plan matches the expected plan'
    assert generated_plan == expected_plan
示例#3
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def test_split_deep(tmp_path, keep_cwd: pathlib.Path,
                    simplified_nist_catalog: oscatalog.Catalog,
                    monkeypatch: MonkeyPatch) -> None:
    """Test deep split of model."""
    # prepare trestle project dir with the file
    cat_name = 'mycat'
    trestle_root = test_utils.create_trestle_project_with_model(
        tmp_path, simplified_nist_catalog, cat_name, monkeypatch)

    orig_model: oscatalog.Catalog = simplified_nist_catalog

    catalog_dir = trestle_root / 'catalogs' / cat_name
    catalog_file: pathlib.Path = catalog_dir / 'catalog.json'

    os.chdir(catalog_dir)
    args = argparse.Namespace(file='catalog.json',
                              element='catalog.groups.*.controls.*.controls.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0

    args = argparse.Namespace(element='catalog.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert MergeCmd()._run(args) == 0

    new_model: oscatalog.Catalog = oscatalog.Catalog.oscal_read(catalog_file)
    assert test_utils.models_are_equivalent(orig_model, new_model)
示例#4
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def test_split_tutorial_workflow(tmp_path, keep_cwd: pathlib.Path,
                                 simplified_nist_catalog: oscatalog.Catalog,
                                 monkeypatch: MonkeyPatch) -> None:
    """Test split operations and final re-merge in workflow tutorial."""
    # prepare trestle project dir with the file
    cat_name = 'mycat'
    trestle_root = test_utils.create_trestle_project_with_model(
        tmp_path, simplified_nist_catalog, cat_name, monkeypatch)

    catalog_dir = trestle_root / 'catalogs' / cat_name
    catalog_file: pathlib.Path = catalog_dir / 'catalog.json'
    orig_model = oscatalog.Catalog.oscal_read(catalog_file)

    # step0
    os.chdir(catalog_dir)
    args = argparse.Namespace(
        file='catalog.json',
        element='catalog.metadata,catalog.groups,catalog.back-matter',
        verbose=1,
        trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0

    # step1
    os.chdir('catalog')
    args = argparse.Namespace(file='metadata.json',
                              element='metadata.roles,metadata.parties',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0

    # step2
    os.chdir('metadata')
    args = argparse.Namespace(file='roles.json',
                              element='roles.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0
    args = argparse.Namespace(file='parties.json',
                              element='parties.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0

    # step3
    os.chdir('..')
    args = argparse.Namespace(file='./groups.json',
                              element='groups.*.controls.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0

    # step4
    os.chdir(catalog_dir)
    args = argparse.Namespace(element='catalog.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert MergeCmd()._run(args) == 0

    new_model = oscatalog.Catalog.oscal_read(catalog_file)
    assert test_utils.models_are_equivalent(orig_model, new_model)
示例#5
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def test_bad_merge(testdata_dir, tmp_trestle_dir):
    """Test a bad merge element path."""
    # prepare trestle project dir with the file
    test_utils.ensure_trestle_config_dir(tmp_trestle_dir)

    test_data_source = testdata_dir / 'split_merge/step4_split_groups_array/catalogs'

    catalogs_dir = Path('catalogs/')
    mycatalog_dir = catalogs_dir / 'mycatalog'

    # Copy files from test/data/split_merge/step4
    shutil.rmtree(catalogs_dir)
    shutil.copytree(test_data_source, catalogs_dir)

    os.chdir(mycatalog_dir)
    cmd = MergeCmd()
    args = argparse.Namespace(verbose=1, element='catalog.roles')
    assert cmd._run(args) == 1
示例#6
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def test_split_merge(testdata_dir: pathlib.Path,
                     tmp_trestle_dir: pathlib.Path) -> None:
    """Test merging data that has been split using the split command- to ensure symmetry."""
    # trestle split -f catalog.json -e catalog.groups.*.controls.*

    # prepare trestle project dir with the file
    test_utils.ensure_trestle_config_dir(tmp_trestle_dir)

    test_data_source = testdata_dir / 'split_merge/step0-merged_catalog/catalogs'

    catalogs_dir = Path('catalogs/')
    mycatalog_dir = catalogs_dir / 'mycatalog'

    # Copy files from test/data/split_merge/step4
    shutil.rmtree(catalogs_dir)
    shutil.copytree(test_data_source, catalogs_dir)

    os.chdir(mycatalog_dir)
    catalog_file = Path('catalog.json')

    # Read and store the catalog before split
    stripped_catalog_type, _ = ModelUtils.get_stripped_model_type(
        catalog_file.resolve(), tmp_trestle_dir)
    pre_split_catalog = stripped_catalog_type.oscal_read(catalog_file)
    assert 'groups' in pre_split_catalog.__fields__.keys()

    # Split the catalog
    args = argparse.Namespace(name='split',
                              file='catalog.json',
                              verbose=1,
                              element='catalog.groups.*.controls.*',
                              trestle_root=tmp_trestle_dir)
    split = SplitCmd()._run(args)

    assert split == 0

    interim_catalog_type, _ = ModelUtils.get_stripped_model_type(
        catalog_file.resolve(), tmp_trestle_dir)
    interim_catalog = interim_catalog_type.oscal_read(catalog_file.resolve())
    assert 'groups' not in interim_catalog.__fields__.keys()

    # Merge everything back into the catalog
    # Equivalent to trestle merge -e catalog.*
    args = argparse.Namespace(name='merge',
                              element='catalog.*',
                              verbose=2,
                              trestle_root=tmp_trestle_dir)
    rc = MergeCmd()._run(args)
    assert rc == 0

    # Check both the catalogs are the same.
    post_catalog_type, _ = ModelUtils.get_stripped_model_type(
        catalog_file.resolve(), tmp_trestle_dir)
    post_merge_catalog = post_catalog_type.oscal_read(catalog_file)
    assert post_merge_catalog == pre_split_catalog
示例#7
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def test_no_file_given(tmp_path, keep_cwd: pathlib.Path,
                       simplified_nist_catalog: oscatalog.Catalog,
                       monkeypatch: MonkeyPatch) -> None:
    """Test split with no file specified."""
    # prepare trestle project dir with the file
    cat_name = 'mycat'
    trestle_root = test_utils.create_trestle_project_with_model(
        tmp_path, simplified_nist_catalog, cat_name, monkeypatch)

    orig_model: oscatalog.Catalog = simplified_nist_catalog

    catalog_dir = trestle_root / 'catalogs' / cat_name
    catalog_file: pathlib.Path = catalog_dir / 'catalog.json'

    # no file given and cwd not in trestle directory should fail
    os.chdir(tmp_path)
    args = argparse.Namespace(file=None,
                              element='catalog.groups',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 1

    os.chdir(catalog_dir)
    args = argparse.Namespace(file=None,
                              element='catalog.groups,catalog.metadata',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0
    assert (catalog_dir / 'catalog/groups.json').exists()
    assert (catalog_dir / 'catalog/metadata.json').exists()

    os.chdir('./catalog')
    args = argparse.Namespace(file=None,
                              element='groups.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0
    assert (catalog_dir / 'catalog/groups/00000__group.json').exists()

    os.chdir('./groups')
    args = argparse.Namespace(file='00000__group.json',
                              element='group.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert SplitCmd()._run(args) == 0

    os.chdir(catalog_dir)
    args = argparse.Namespace(file=None,
                              element='catalog.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert MergeCmd()._run(args) == 0

    new_model: oscatalog.Catalog = oscatalog.Catalog.oscal_read(catalog_file)
    assert test_utils.models_are_equivalent(orig_model, new_model)
示例#8
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def test_merge_invalid_element_path(testdata_dir, tmp_trestle_dir):
    """Test to make sure each element in -e contains 2 parts at least, and no chained element paths."""
    cmd = MergeCmd()
    args = argparse.Namespace(verbose=1,
                              element='catalog',
                              trestle_root=tmp_trestle_dir)
    assert cmd._run(args) == 1

    args = argparse.Namespace(verbose=1,
                              element='catalog.metadata',
                              trestle_root=tmp_trestle_dir)
    test_utils.ensure_trestle_config_dir(tmp_trestle_dir)
    test_data_source = testdata_dir / 'split_merge/step4_split_groups_array/catalogs'
    catalogs_dir = Path('catalogs/')
    mycatalog_dir = catalogs_dir / 'mycatalog'

    # Copy files from test/data/split_merge/step4
    shutil.rmtree(catalogs_dir)
    shutil.copytree(test_data_source, catalogs_dir)

    os.chdir(mycatalog_dir)
    assert cmd._run(args) == 0
示例#9
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def test_split_comp_def(
        mode, tmp_path, keep_cwd: pathlib.Path,
        sample_component_definition: component.ComponentDefinition,
        monkeypatch: MonkeyPatch) -> None:
    """Test splitting of component definition and its dictionary."""
    compdef_name = 'mycomp'
    trestle_root = test_utils.create_trestle_project_with_model(
        tmp_path, sample_component_definition, compdef_name, monkeypatch)

    compdef_dir = trestle_root / 'component-definitions' / compdef_name
    compdef_file: pathlib.Path = compdef_dir / 'component-definition.json'
    original_model = sample_component_definition

    os.chdir(compdef_dir)
    # do the split in different ways - then re-merge
    if mode == 'normal_split.*':
        args = argparse.Namespace(file='component-definition.json',
                                  element='component-definition.components.*',
                                  verbose=1,
                                  trestle_root=trestle_root)
        assert SplitCmd()._run(args) == 0
    elif mode == 'split_two_steps':
        args = argparse.Namespace(file='component-definition.json',
                                  element='component-definition.components',
                                  verbose=1,
                                  trestle_root=trestle_root)
        assert SplitCmd()._run(args) == 0
        os.chdir('component-definition')
        args = argparse.Namespace(file='components.json',
                                  element='components.*',
                                  verbose=1,
                                  trestle_root=trestle_root)
        assert SplitCmd()._run(args) == 0
    elif mode == 'split_in_lower_dir':
        args = argparse.Namespace(
            file='component-definition.json',
            element='component-definition.components.*.props',
            verbose=1,
            trestle_root=trestle_root)
        assert SplitCmd()._run(args) == 0

    os.chdir(compdef_dir)
    args = argparse.Namespace(element='component-definition.*',
                              verbose=1,
                              trestle_root=trestle_root)
    assert MergeCmd()._run(args) == 0

    new_model = component.ComponentDefinition.oscal_read(compdef_file)
    assert test_utils.models_are_equivalent(new_model, original_model)
示例#10
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def test_merge_plan_simple_case(testdata_dir, tmp_trestle_dir):
    """Test '$mycatalog$ trestle merge -e catalog.back-matter'."""
    # Assume we are running a command like below
    # trestle merge -e catalog.back-matter
    content_type = FileContentType.JSON
    fext = FileContentType.to_file_extension(content_type)

    # prepare trestle project dir with the file
    test_utils.ensure_trestle_config_dir(tmp_trestle_dir)

    test_data_source = testdata_dir / 'split_merge/step4_split_groups_array/catalogs'

    catalogs_dir = Path('catalogs/')
    mycatalog_dir = catalogs_dir / 'mycatalog'
    catalog_dir = mycatalog_dir / 'catalog'

    # Copy files from test/data/split_merge/step4
    shutil.rmtree(catalogs_dir)
    shutil.copytree(test_data_source, catalogs_dir)

    os.chdir(mycatalog_dir)
    catalog_file = Path(f'catalog{fext}').resolve()
    catalog_dir = Path('catalog/')
    back_matter_file = (catalog_dir / f'back-matter{fext}').resolve()

    assert catalog_file.exists()
    assert back_matter_file.exists()

    # Read files

    # The destination file/model needs to be loaded in a stripped model
    stripped_catalog_type, _ = ModelUtils.get_stripped_model_type(
        catalog_file.resolve(), tmp_trestle_dir)
    stripped_catalog = stripped_catalog_type.oscal_read(catalog_file)

    # Back-matter model needs to be complete and if it is decomposed, needs to be merged recursively first
    back_matter = common.BackMatter.oscal_read(back_matter_file)

    # Back-matter needs to be inserted in a stripped Catalog that does NOT exclude the back-matter fields

    merged_catalog_type, merged_catalog_alias = ModelUtils.get_stripped_model_type(
        catalog_file.resolve(),
        tmp_trestle_dir,
        aliases_not_to_be_stripped=['back-matter'])
    merged_dict = stripped_catalog.__dict__
    merged_dict['back-matter'] = back_matter
    merged_catalog = merged_catalog_type(**merged_dict)

    element = Element(merged_catalog, merged_catalog_alias)

    # Create hand-crafter merge plan
    reset_destination_action = CreatePathAction(catalog_file,
                                                clear_content=True)
    write_destination_action = WriteFileAction(catalog_file,
                                               element,
                                               content_type=content_type)
    delete_element_action = RemovePathAction(back_matter_file)

    expected_plan: Plan = Plan()
    expected_plan.add_action(reset_destination_action)
    expected_plan.add_action(write_destination_action)
    expected_plan.add_action(delete_element_action)

    # Call merge()

    generated_plan = MergeCmd.merge(Path.cwd(),
                                    ElementPath('catalog.back-matter'),
                                    tmp_trestle_dir)

    # Assert the generated plan matches the expected plan'
    assert generated_plan == expected_plan
示例#11
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def test_split_merge_out_of_context(testdata_dir, tmp_trestle_dir,
                                    rel_context_dir: str, use_absolutes: bool,
                                    split_elem: str, merge_elem: str,
                                    use_effective_cwd: bool):
    """Test merging data that has been split using the split command- to ensure symmetry."""
    # trestle split -f catalog.json -e catalog.groups.*.controls.*

    # prepare trestle project dir with the file - could e cleaned up.
    test_utils.ensure_trestle_config_dir(tmp_trestle_dir)
    test_data_source = testdata_dir / 'split_merge/step0-merged_catalog/catalogs/'  # Pontentially change to NIST DIR
    catalogs_dir = Path('catalogs/')
    shutil.rmtree(catalogs_dir)
    shutil.copytree(test_data_source, catalogs_dir)

    full_path_to_model_dir = tmp_trestle_dir / 'catalogs' / 'mycatalog'
    full_path_to_model = full_path_to_model_dir / 'catalog.json'
    full_context_dir = tmp_trestle_dir / rel_context_dir

    if use_absolutes:
        model_file = full_path_to_model
    else:
        model_file = full_path_to_model.relative_to(full_context_dir)

    # Always use full context dir for safety
    os.chdir(full_context_dir)

    # Read and store the catalog before split
    stripped_catalog_type, _ = ModelUtils.get_stripped_model_type(
        full_path_to_model.resolve(), tmp_trestle_dir)
    pre_split_catalog = stripped_catalog_type.oscal_read(full_path_to_model)
    assert 'groups' in pre_split_catalog.__fields__.keys()

    # Split the catalog
    args = argparse.Namespace(name='split',
                              file=model_file,
                              verbose=0,
                              element=split_elem,
                              trestle_root=tmp_trestle_dir)
    split = SplitCmd()._run(args)

    assert split == 0

    interim_catalog_type, _ = ModelUtils.get_stripped_model_type(
        full_path_to_model.resolve(), tmp_trestle_dir)
    interim_catalog = interim_catalog_type.oscal_read(
        full_path_to_model.resolve())
    assert 'groups' not in interim_catalog.__fields__.keys()

    # Merge everything back into the catalog
    # Equivalent to trestle merge -e catalog.*
    if use_effective_cwd:
        plan = MergeCmd.merge(full_path_to_model_dir,
                              ElementPath(merge_elem),
                              trestle_root=tmp_trestle_dir)

    else:
        os.chdir(full_path_to_model_dir)
        plan = MergeCmd.merge(pathlib.Path.cwd(),
                              ElementPath(merge_elem),
                              trestle_root=tmp_trestle_dir)
    plan.execute()

    # Check both the catalogs are the same.
    post_catalog_type, _ = ModelUtils.get_stripped_model_type(
        full_path_to_model.resolve(), tmp_trestle_dir)
    post_merge_catalog = post_catalog_type.oscal_read(full_path_to_model)
    assert post_merge_catalog == pre_split_catalog
示例#12
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def test_merge_expanded_metadata_into_catalog(testdata_dir, tmp_trestle_dir):
    """Test '$mycatalog$ trestle merge -e catalog.metadata' when metadata is already split."""
    # Assume we are running a command like below
    # trestle merge -e catalog.back-matter
    content_type = FileContentType.JSON
    fext = FileContentType.to_file_extension(content_type)

    # prepare trestle project dir with the file
    test_utils.ensure_trestle_config_dir(tmp_trestle_dir)

    test_data_source = testdata_dir / 'split_merge/step4_split_groups_array/catalogs'
    catalogs_dir = Path('catalogs/')
    mycatalog_dir = catalogs_dir / 'mycatalog'
    catalog_dir = mycatalog_dir / 'catalog'

    # Copy files from test/data/split_merge/step4
    shutil.rmtree(catalogs_dir)
    shutil.copytree(test_data_source, catalogs_dir)

    # Change directory to mycatalog_dir
    os.chdir(mycatalog_dir)
    catalog_file = Path(f'catalog{fext}').resolve()
    catalog_dir = Path('catalog/')
    metadata_dir = catalog_dir / 'metadata'
    metadata_file = (catalog_dir / f'metadata{fext}').resolve()

    assert catalog_file.exists()
    assert metadata_dir.exists()
    assert metadata_file.exists()

    # Read files

    # Create hand-crafter merge plan
    expected_plan: Plan = Plan()

    reset_destination_action = CreatePathAction(catalog_file,
                                                clear_content=True)
    expected_plan.add_action(reset_destination_action)

    _, _, merged_metadata_instance = ModelUtils.load_distributed(
        metadata_file, tmp_trestle_dir)
    merged_catalog_type, _ = ModelUtils.get_stripped_model_type(
        catalog_file.resolve(),
        tmp_trestle_dir,
        aliases_not_to_be_stripped=['metadata'])
    stripped_catalog_type, _ = ModelUtils.get_stripped_model_type(
        catalog_file, tmp_trestle_dir)
    stripped_catalog = stripped_catalog_type.oscal_read(catalog_file)
    merged_catalog_dict = stripped_catalog.__dict__
    merged_catalog_dict['metadata'] = merged_metadata_instance
    merged_catalog = merged_catalog_type(**merged_catalog_dict)
    element = Element(merged_catalog)
    write_destination_action = WriteFileAction(catalog_file,
                                               element,
                                               content_type=content_type)
    expected_plan.add_action(write_destination_action)
    delete_element_action = RemovePathAction(metadata_file)
    expected_plan.add_action(delete_element_action)

    # Call merge()
    generated_plan = MergeCmd.merge(Path.cwd(),
                                    ElementPath('catalog.metadata'),
                                    tmp_trestle_dir)

    # Assert the generated plan matches the expected plan'
    assert generated_plan == expected_plan
示例#13
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def test_merge_plan_simple_list(testdata_dir, tmp_trestle_dir):
    """Test '$mycatalog$ trestle merge -e metadata.roles'."""
    # Assume we are running a command like below
    # trestle merge -e catalog.back-matter
    content_type = FileContentType.JSON
    fext = FileContentType.to_file_extension(content_type)

    # prepare trestle project dir with the file
    test_utils.ensure_trestle_config_dir(tmp_trestle_dir)

    test_data_source = testdata_dir / 'split_merge/step4_split_groups_array/catalogs'

    catalogs_dir = Path('catalogs/')
    mycatalog_dir = catalogs_dir / 'mycatalog'
    catalog_dir = mycatalog_dir / 'catalog'

    # Copy files from test/data/split_merge/step4
    shutil.rmtree(catalogs_dir)
    shutil.copytree(test_data_source, catalogs_dir)

    os.chdir(mycatalog_dir)
    catalog_dir = Path('catalog/')
    os.chdir(catalog_dir)
    metadata_dir = Path('metadata/')
    metadata_file = Path(f'metadata{fext}')
    roles_dir = metadata_dir / 'roles'

    # Read files

    # The destination file/model needs to be loaded in a stripped model
    stripped_metadata_type, _ = fs.get_stripped_contextual_model(
        metadata_file.absolute())
    stripped_metadata = stripped_metadata_type.oscal_read(metadata_file)

    # Back-matter model needs to be complete and if it is decomposed, needs to be merged recursively first
    roles = [
        oscatalog.Role.oscal_read(roles_dir / '00000__role.json'),
        oscatalog.Role.oscal_read(roles_dir / '00001__role.json')
    ]

    # Back-matter needs to be inserted in a stripped Catalog that does NOT exclude the back-matter fields

    merged_metadata_type, merged_metadata_alias = fs.get_stripped_contextual_model(
        metadata_file.absolute(), aliases_not_to_be_stripped=['roles'])
    merged_dict = stripped_metadata.__dict__
    merged_dict['roles'] = roles
    merged_metadata = merged_metadata_type(**merged_dict)

    element = Element(merged_metadata, merged_metadata_alias)

    # Create hand-crafter merge plan
    reset_destination_action = CreatePathAction(metadata_file.absolute(),
                                                clear_content=True)
    write_destination_action = WriteFileAction(metadata_file,
                                               element,
                                               content_type=content_type)
    delete_element_action = RemovePathAction(roles_dir.absolute())

    expected_plan: Plan = Plan()
    expected_plan.add_action(reset_destination_action)
    expected_plan.add_action(write_destination_action)
    expected_plan.add_action(delete_element_action)

    # Call merged()

    generated_plan = MergeCmd.merge(ElementPath('metadata.roles'))

    # Assert the generated plan matches the expected plan'
    assert len(list(diff(generated_plan, expected_plan))) == 0