openlp/tests/openlp_core/common/test_path.py

# -*- coding: utf-8 -*-

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"""
Package to test the openlp.core.common.path package.
"""
import os
import pytest
from pathlib import Path

from unittest.mock import MagicMock, patch

from openlp.core.common.path import create_paths, files_to_paths, path_to_str, replace_params, str_to_path, which


def test_replace_params_no_params():
    """
    Test replace_params when called with and empty tuple instead of parameters to replace
    """
    # GIVEN: Some test data
    test_args = (1, 2)
    test_kwargs = {'arg3': 3, 'arg4': 4}
    test_params = tuple()

    # WHEN: Calling replace_params
    result_args, result_kwargs = replace_params(test_args, test_kwargs, test_params)

    # THEN: The positional and keyword args should not have changed
    assert test_args == result_args
    assert test_kwargs == result_kwargs


def test_replace_params_params():
    """
    Test replace_params when given a positional and a keyword argument to change
    """
    # GIVEN: Some test data
    test_args = (1, 2)
    test_kwargs = {'arg3': 3, 'arg4': 4}
    test_params = ((1, 'arg2', str), (2, 'arg3', str))

    # WHEN: Calling replace_params
    result_args, result_kwargs = replace_params(test_args, test_kwargs, test_params)

    # THEN: The positional and keyword args should have have changed
    assert result_args == (1, '2')
    assert result_kwargs == {'arg3': '3', 'arg4': 4}


def test_which_no_command():
    """
    Test :func:`openlp.core.common.path.which` when the command is not found.
    """
    # GIVEN: A mocked :func:`shutil.which` when the command is not found.
    with patch('openlp.core.common.path.shutil.which', return_value=None) as mocked_shutil_which:

        # WHEN: Calling :func:`openlp.core.common.path.which` with a command that does not exist.
        result = which('no_command')

        # THEN: :func:`shutil.which` should have been called with the command, and :func:`which` should return None.
        mocked_shutil_which.assert_called_once_with('no_command')
    assert result is None


def test_which_command():
    """
    Test :func:`openlp.core.common.path.which` when a command has been found.
    """
    # GIVEN: A mocked :func:`shutil.which` when the command is found.
    with patch('openlp.core.common.path.shutil.which',
               return_value=os.path.join('path', 'to', 'command')) as mocked_shutil_which:

        # WHEN: Calling :func:`openlp.core.common.path.which` with a command that exists.
        result = which('command')

        # THEN: :func:`shutil.which` should have been called with the command, and :func:`which` should return a
        #       Path object equivalent of the command path.
        mocked_shutil_which.assert_called_once_with('command')
        assert result == Path('path', 'to', 'command')


def test_path_to_str_type_error():
    """
    Test that `path_to_str` raises a type error when called with an invalid type
    """
    # GIVEN: The `path_to_str` function
    # WHEN: Calling `path_to_str` with an invalid Type
    # THEN: A TypeError should have been raised
    with pytest.raises(TypeError):
        path_to_str(57)


def test_path_to_str_wth_str():
    """
    Test that `path_to_str` just returns a str when given a str
    """
    # GIVEN: The `path_to_str` function
    # WHEN: Calling `path_to_str` with a str
    result = path_to_str('/usr/bin')

    # THEN: The string should be returned
    assert result == '/usr/bin'


def test_path_to_str_none():
    """
    Test that `path_to_str` correctly converts the path parameter when passed with None
    """
    # GIVEN: The `path_to_str` function
    # WHEN: Calling the `path_to_str` function with None
    result = path_to_str(None)

    # THEN: `path_to_str` should return an empty string
    assert result == ''


def test_path_to_str_path_object():
    """
    Test that `path_to_str` correctly converts the path parameter when passed a Path object
    """
    # GIVEN: The `path_to_str` function
    # WHEN: Calling the `path_to_str` function with a Path object
    result = path_to_str(Path('test/path'))

    # THEN: `path_to_str` should return a string representation of the Path object
    assert result == os.path.join('test', 'path')


def test_str_to_path_type_error():
    """
    Test that `str_to_path` returns None if called with invalid information
    """
    # GIVEN: The `str_to_path` function
    # WHEN: Calling `str_to_path` with an invalid Type
    # THEN: None is returned
    assert str_to_path(Path()) is None


def test_str_to_path_empty_str():
    """
    Test that `str_to_path` correctly converts the string parameter when passed with and empty string
    """
    # GIVEN: The `str_to_path` function
    # WHEN: Calling the `str_to_path` function with None
    result = str_to_path('')

    # THEN: `path_to_str` should return None
    assert result is None


def test_create_paths_dir_exists():
    """
    Test the create_paths() function when the path already exists
    """
    # GIVEN: A `Path` to check with patched out mkdir and exists methods
    mocked_path = MagicMock()
    mocked_path.exists.return_value = True

    # WHEN: `create_paths` is called and the path exists
    create_paths(mocked_path)

    # THEN: The function should not attempt to create the directory
    mocked_path.exists.assert_called_once_with()
    assert mocked_path.mkdir.call_count == 0, 'mkdir should not have been called'


def test_create_paths_dir_doesnt_exists():
    """
    Test the create_paths() function when the path does not already exist
    """
    # GIVEN: A `Path` to check with patched out mkdir and exists methods
    mocked_path = MagicMock()
    mocked_path.exists.return_value = False

    # WHEN: `create_paths` is called and the path does not exist
    create_paths(mocked_path)

    # THEN: The directory should have been created
    mocked_path.exists.assert_called_once_with()
    mocked_path.mkdir.assert_called_once_with(parents=True)


@patch('openlp.core.common.path.log')
def test_create_paths_dir_io_error(mocked_logger):
    """
    Test the create_paths() when an OSError is raised
    """
    # GIVEN: A `Path` to check with patched out mkdir and exists methods
    mocked_path = MagicMock()
    mocked_path.exists.side_effect = OSError('Cannot make directory')

    # WHEN: An OSError is raised when checking the if the path exists.
    create_paths(mocked_path)

    # THEN: The Error should have been logged
    mocked_logger.exception.assert_called_once_with('failed to check if directory exists or create directory')


def test_create_paths_dir_value_error():
    """
    Test the create_paths() when an error other than OSError is raised
    """
    # GIVEN: A `Path` to check with patched out mkdir and exists methods
    mocked_path = MagicMock()
    mocked_path.exists.side_effect = ValueError('Some other error')

    # WHEN: Some other exception is raised
    try:
        create_paths(mocked_path)
        assert False, 'create_paths should have thrown an exception'
    except Exception:
        # THEN: `create_paths` raises an exception
        pass


def test_files_to_paths():
    """
    Test the files_to_paths() method
    """
    # GIVEN: A list of string filenames
    test_files = ['/tmp/openlp/file1.txt', '/tmp/openlp/file2.txt']

    # WHEN: files_to_paths is called
    result = files_to_paths(test_files)

    # THEN: The result should be a list of Paths
    assert result == [Path('/tmp/openlp/file1.txt'), Path('/tmp/openlp/file2.txt')]