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openlp/tests/functional/openlp_core/common/test_json.py

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# -*- coding: utf-8 -*-
##########################################################################
# OpenLP - Open Source Lyrics Projection #
# ---------------------------------------------------------------------- #
# Copyright (c) 2008-2020 OpenLP Developers #
# ---------------------------------------------------------------------- #
# This program is free software: you can redistribute it and/or modify #
# it under the terms of the GNU General Public License as published by #
# the Free Software Foundation, either version 3 of the License, or #
# (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program. If not, see <https://www.gnu.org/licenses/>. #
##########################################################################
"""
Package to test the openlp.core.common.json package.
"""
import json
import os
from pathlib import Path
from unittest import TestCase
from unittest.mock import patch
from openlp.core.common import is_win
from openlp.core.common.json import JSONMixin, OpenLPJSONDecoder, OpenLPJSONEncoder, PathSerializer, _registered_classes
class BaseTestClass(object):
"""
Simple class to avoid repetition
"""
def __init__(self, a=None, b=None, c=None):
self.a = a
self.b = b
self.c = c
class TestJSONMixin(TestCase):
"""
Test the JSONMixin class
"""
def setUp(self):
self._registered_classes_patcher = patch.dict(_registered_classes, clear=True)
self.addCleanup(self._registered_classes_patcher.stop)
self._registered_classes_patcher.start()
def test_subclass_json_mixin(self):
"""
Test that a class is `registered` when subclassing JSONMixin
"""
# GIVEN: The JSONMixin class
# WHEN: Subclassing it
class TestClass(JSONMixin):
pass
# THEN: The TestClass should have been `registered`
assert _registered_classes['TestClass'] == TestClass
def test_subclass_json_mixin_alt_names(self):
"""
Test that a class is `registered` using the specified names when subclassing JSONMixin
"""
# GIVEN: The JSONMixin class
# WHEN: Subclassing it with custom names
class TestClass(JSONMixin, register_names=('AltName1', 'AltName2')):
pass
# THEN: The TestClass should have been registered with only those names
assert 'TestClass' not in _registered_classes
assert _registered_classes['AltName1'] == TestClass
assert _registered_classes['AltName2'] == TestClass
def test_encoding_json_mixin_subclass(self):
"""
Test that an instance of a JSONMixin subclass is properly serialized to a JSON string
"""
# GIVEN: A instance of a subclass of the JSONMixin class
class TestClass(BaseTestClass, JSONMixin):
_json_keys = ['a', 'b']
instance = TestClass(a=1, c=2)
# WHEN: Serializing the instance
json_string = json.dumps(instance, cls=OpenLPJSONEncoder)
# THEN: Only the attributes specified by `_json_keys` should be serialized, and only if they have been set
assert json_string == '{"a": 1, "json_meta": {"class": "TestClass", "version": 1}}'
def test_decoding_json_mixin_subclass(self):
"""
Test that an instance of a JSONMixin subclass is properly deserialized from a JSON string
"""
# GIVEN: A subclass of the JSONMixin class
class TestClass(BaseTestClass, JSONMixin):
_json_keys = ['a', 'b']
# WHEN: Deserializing a JSON representation of the TestClass
instance = json.loads(
'{"a": 1, "c": 2, "json_meta": {"class": "TestClass", "version": 1}}', cls=OpenLPJSONDecoder)
# THEN: Only the attributes specified by `_json_keys` should have been set
assert instance.__class__ == TestClass
assert instance.a == 1
assert instance.b is None
assert instance.c is None
def test_encoding_json_mixin_subclass_custom_name(self):
"""
Test that an instance of a JSONMixin subclass is properly serialized to a JSON string when using a custom name
"""
# GIVEN: A instance of a subclass of the JSONMixin class with a custom name
class TestClass(BaseTestClass, JSONMixin, register_names=('AltName', )):
_json_keys = ['a', 'b']
_name = 'AltName'
_version = 2
instance = TestClass(a=1, c=2)
# WHEN: Serializing the instance
json_string = json.dumps(instance, cls=OpenLPJSONEncoder)
# THEN: Only the attributes specified by `_json_keys` should be serialized, and only if they have been set
assert json_string == '{"a": 1, "json_meta": {"class": "AltName", "version": 2}}'
def test_decoding_json_mixin_subclass_custom_name(self):
"""
Test that an instance of a JSONMixin subclass is properly deserialized from a JSON string when using a custom
name
"""
# GIVEN: A instance of a subclass of the JSONMixin class with a custom name
class TestClass(BaseTestClass, JSONMixin, register_names=('AltName', )):
_json_keys = ['a', 'b']
_name = 'AltName'
_version = 2
# WHEN: Deserializing a JSON representation of the TestClass
instance = json.loads(
'{"a": 1, "c": 2, "json_meta": {"class": "AltName", "version": 2}}', cls=OpenLPJSONDecoder)
# THEN: Only the attributes specified by `_json_keys` should have been set
assert instance.__class__ == TestClass
assert instance.a == 1
assert instance.b is None
assert instance.c is None
class TestOpenLPJSONDecoder(TestCase):
"""
Test the OpenLPJsonDecoder class
"""
def test_object_hook_path_object(self):
"""
Test the object_hook method when called with a decoded Path JSON object
"""
# GIVEN: An instance of OpenLPJsonDecoder
instance = OpenLPJSONDecoder()
# WHEN: Calling the object_hook method with a decoded JSON object which contains a Path
result = instance.object_hook({'parts': ['test', 'path'], "json_meta": {"class": "Path", "version": 1}})
# THEN: A Path object should be returned
assert result == Path('test', 'path')
def test_object_hook_non_path_object(self):
"""
Test the object_hook method when called with a decoded JSON object
"""
# GIVEN: An instance of OpenLPJsonDecoder
instance = OpenLPJSONDecoder()
# WHEN: Calling the object_hook method with a decoded JSON object which contains a Path
with patch('openlp.core.common.json.Path') as mocked_path:
result = instance.object_hook({'key': 'value'})
# THEN: The object should be returned unchanged and a Path object should not have been initiated
assert result == {'key': 'value'}
assert mocked_path.called is False
def test_json_decode(self):
"""
Test the OpenLPJsonDecoder when decoding a JSON string
"""
# GIVEN: A JSON encoded string
json_string = '[{"parts": ["test", "path1"], "json_meta": {"class": "Path", "version": 1}}, ' \
'{"parts": ["test", "path2"], "json_meta": {"class": "Path", "version": 1}}, ' \
'{"key": "value", "json_meta": {"class": "Object"}}]'
# WHEN: Decoding the string using the OpenLPJsonDecoder class
obj = json.loads(json_string, cls=OpenLPJSONDecoder)
# THEN: The object returned should be a python version of the JSON string
assert obj == [Path('test', 'path1'), Path('test', 'path2'), {'key': 'value', 'json_meta': {'class': 'Object'}}]
def test_json_decode_old_style(self):
"""
Test the OpenLPJsonDecoder when decoding a JSON string with an old-style Path object
"""
# GIVEN: A JSON encoded string
json_string = '[{"__Path__": ["test", "path1"]}, ' \
'{"__Path__": ["test", "path2"]}]'
# WHEN: Decoding the string using the OpenLPJsonDecoder class
obj = json.loads(json_string, cls=OpenLPJSONDecoder)
# THEN: The object returned should be a python version of the JSON string
assert obj == [Path('test', 'path1'), Path('test', 'path2')]
class TestOpenLPJSONEncoder(TestCase):
"""
Test the OpenLPJSONEncoder class
"""
def test_default_path_object(self):
"""
Test the default method when called with a Path object
"""
# GIVEN: An instance of OpenLPJSONEncoder
instance = OpenLPJSONEncoder()
# WHEN: Calling the default method with a Path object
result = instance.default(Path('test', 'path'))
# THEN: A dictionary object that can be JSON encoded should be returned
assert result == {'parts': ('test', 'path'), "json_meta": {"class": "Path", "version": 1}}
def test_default_non_path_object(self):
"""
Test the default method when called with a object other than a Path object
"""
with patch('openlp.core.common.json.JSONEncoder.default') as mocked_super_default:
# GIVEN: An instance of OpenLPJSONEncoder
instance = OpenLPJSONEncoder()
# WHEN: Calling the default method with a object other than a Path object
instance.default('invalid object')
# THEN: default method of the super class should have been called
mocked_super_default.assert_called_once_with('invalid object')
def test_json_encode(self):
"""
Test the OpenLPJsonDEncoder when encoding an object conatining Path objects
"""
# GIVEN: A list of Path objects
obj = [Path('test', 'path1'), Path('test', 'path2')]
# WHEN: Encoding the object using the OpenLPJSONEncoder class
json_string = json.dumps(obj, cls=OpenLPJSONEncoder)
# THEN: The JSON string return should be a representation of the object encoded
assert json_string == '[{"parts": ["test", "path1"], "json_meta": {"class": "Path", "version": 1}}, ' \
'{"parts": ["test", "path2"], "json_meta": {"class": "Path", "version": 1}}]'
class TestPathSerializer(TestCase):
def test_path_encode_json(self):
"""
Test that `Path.encode_json` returns a Path object from a dictionary representation of a Path object decoded
from JSON
"""
# GIVEN: A Path object from openlp.core.common.path
# WHEN: Calling encode_json, with a dictionary representation
path = PathSerializer.encode_json(
{'parts': ['path', 'to', 'fi.le'], "json_meta": {"class": "Path", "version": 1}}, extra=1, args=2)
# THEN: A Path object should have been returned
assert path == Path('path', 'to', 'fi.le')
def test_path_encode_json_base_path(self):
"""
Test that `Path.encode_json` returns a Path object from a dictionary representation of a Path object decoded
from JSON when the base_path arg is supplied.
"""
# GIVEN: A Path object from openlp.core.common.path
# WHEN: Calling encode_json, with a dictionary representation
path = PathSerializer.encode_json(
{'parts': ['path', 'to', 'fi.le'], "json_meta": {"class": "Path", "version": 1}}, base_path=Path('/base'))
# THEN: A Path object should have been returned with an absolute path
assert path == Path('/', 'base', 'path', 'to', 'fi.le')
def test_path_json_object(self):
"""
Test that `Path.json_object` creates a JSON decode-able object from a Path object
"""
# GIVEN: A Path object from openlp.core.common.path
path = Path('/base', 'path', 'to', 'fi.le')
# WHEN: Calling json_object
obj = PathSerializer().json_object(path, extra=1, args=2)
# THEN: A JSON decodeable object should have been returned.
assert obj == {'parts': (os.sep, 'base', 'path', 'to', 'fi.le'), "json_meta": {"class": "Path", "version": 1}}
def test_path_json_object_is_js(self):
"""
Test that `Path.json_object` creates a JSON decode-able object from a Path object
"""
# GIVEN: A Path object from openlp.core.common.path
if is_win():
path = Path('c:\\', 'base', 'path', 'to', 'fi.le')
else:
path = Path('/base', 'path', 'to', 'fi.le')
# WHEN: Calling json_object
obj = PathSerializer().json_object(path, is_js=True, extra=1, args=2)
# THEN: A URI should be returned
if is_win():
assert obj == 'file:///c:/base/path/to/fi.le'
else:
assert obj == 'file:///base/path/to/fi.le'
def test_path_json_object_base_path(self):
"""
Test that `Path.json_object` creates a JSON decode-able object from a Path object, that is relative to the
base_path
"""
# GIVEN: A Path object from openlp.core.common.path
path = Path('/base', 'path', 'to', 'fi.le')
# WHEN: Calling json_object with a base_path
obj = PathSerializer().json_object(path, base_path=Path('/', 'base'))
# THEN: A JSON decodable object should have been returned.
assert obj == {'parts': ('path', 'to', 'fi.le'), "json_meta": {"class": "Path", "version": 1}}
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