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test_module_dataclasses.py
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test_module_dataclasses.py
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# -*- mode: python -*-
# -*- coding: utf-8 -*-
##
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import dataclasses
from dataclasses import dataclass
import unittest
"""
Unit tests demonstrating python data classes.
https://docs.python.org/3/library/dataclasses.html
"""
@dataclass(order=True)
class IssueId:
"""An issue has a project identifier and a number"""
prj: str
num: int = 0
def __str__(self):
"""A custom string representation for the class"""
return f"{self.prj}-{self.num}"
ISSUE0 = IssueId("PRJ")
ISSUE1 = IssueId("PRJ", 1)
class DataclassesModuleTestSuite(unittest.TestCase):
"""Basic test cases."""
def test_issue_id(self) -> None:
self.assertEqual("PRJ", ISSUE1.prj)
self.assertEqual(1, ISSUE1.num)
self.assertEqual("IssueId(prj='PRJ', num=1)", ISSUE1.__repr__())
self.assertEqual(IssueId(num=1, prj="PRJ"), ISSUE1)
def test_issue_id_str(self) -> None:
issue = IssueId("PRJ", 123)
self.assertEqual("PRJ-123", issue.__str__())
self.assertEqual("PRJ-123", str(issue))
def test_issue_id_with_default(self) -> None:
self.assertEqual("IssueId(prj='PRJ', num=0)", ISSUE0.__repr__())
self.assertEqual(IssueId("PRJ", 0), ISSUE0)
self.assertNotEqual(IssueId("PRJ", 1), ISSUE0)
self.assertLess(IssueId("PRJ", -1), ISSUE0)
def test_issue_id_with_modification(self) -> None:
issue = IssueId("PRJ", 123)
self.assertEqual("IssueId(prj='PRJ', num=123)", issue.__repr__())
issue.num = 999
self.assertEqual("IssueId(prj='PRJ', num=999)", issue.__repr__())
def test_issue_id_with_replace(self) -> None:
issue = dataclasses.replace(ISSUE0)
self.assertEqual(ISSUE0, issue)
self.assertIsNot(ISSUE0, issue)
issue.prj = "NEW"
self.assertNotEqual(ISSUE0, issue)
issue2 = dataclasses.replace(issue, num=1000)
self.assertEqual("NEW-1000", str(issue2))
def test_issue_id_asdict(self) -> None:
issue_dict = dataclasses.asdict(ISSUE1)
self.assertDictEqual({"prj": "PRJ", "num": 1}, issue_dict)
def test_issue_id_astuple(self) -> None:
issue_tuple = dataclasses.astuple(ISSUE1)
self.assertTupleEqual(("PRJ", 1), issue_tuple)
def test_make_dataclass(self) -> None:
dynamic_dataclass = dataclasses.make_dataclass(
"IssueId", [("prj", str), ("num", int)]
)
issue = dynamic_dataclass("PRJ", 1)
self.assertEqual("IssueId(prj='PRJ', num=1)", issue.__repr__())
issue.num = 123
self.assertEqual("IssueId(prj='PRJ', num=123)", issue.__repr__())
if __name__ == "__main__":
unittest.main()