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1#!/usr/bin/python3
2#
3# Copyright (C) 2021 The Android Open Source Project
4#
5# Licensed under the Apache License, Version 2.0 (the "License");
6# you may not use this file except in compliance with the License.
7# You may obtain a copy of the License at
8#
9#      http://www.apache.org/licenses/LICENSE-2.0
10#
11# Unless required by applicable law or agreed to in writing, software
12# distributed under the License is distributed on an "AS IS" BASIS,
13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14# See the License for the specific language governing permissions and
15# limitations under the License.
16"""Tests for change_report.py."""
17
18import os
19import pathlib
20import unittest
21
22import change_report
23
24
25class ChangeReportTest(unittest.TestCase):
26  """Tests for ChangeReport."""
27
28  def setUp(self):
29    super().setUp()
30    old_dir = str(ChangeReportTest.get_resrouce_path('old_codebase'))
31    new_dir = str(ChangeReportTest.get_resrouce_path('new_codebase'))
32    self.change_report = change_report.ChangeReport(
33        old_dir, new_dir, state_filter='0,1,2,3,4')
34
35  def test_get_diff_stat_lines(self):
36    """Tests if the diff stat of new & old_codebase matches change_report-new_vs_old_codebase.csv."""
37    diff_stat_lines = []
38    diff_stat_lines.append(change_report.ChangeReport.get_diff_stat_header())
39    diff_stat_lines.extend(self.change_report.get_diff_stat_lines())
40
41    expected_diff_stat_lines = ChangeReportTest.get_expected_lines(
42        'change_report-new_vs_old_codebase.csv')
43
44    offending_line_indexes = ChangeReportTest.diff_lines(
45        expected_diff_stat_lines, diff_stat_lines)
46    self.assertEqual(len(offending_line_indexes), 0)
47
48  def test_get_diff_lines(self):
49    """Tests if the diff stat of new & old_codebase matches change_report_diff-new_vs_old_codebase.txt."""
50    diff_lines = self.change_report.get_diff_lines()
51
52    expected_diff_lines = ChangeReportTest.get_expected_lines(
53        'change_report_diff-new_vs_old_codebase.txt')
54
55    offending_line_indexes = ChangeReportTest.diff_lines(
56        expected_diff_lines, diff_lines)
57    self.assertEqual(len(offending_line_indexes), 0)
58
59  @staticmethod
60  def get_resrouce_path(target):
61    # .../dev/change_report_test.py
62    this_path = pathlib.Path(os.path.abspath(__file__)).parents[0]
63    return pathlib.Path(this_path, 'resource', target)
64
65  @staticmethod
66  def get_expected_lines(target):
67    file = ChangeReportTest.get_resrouce_path(target)
68    with open(file, 'r') as f:
69      lines = f.readlines()
70    return lines
71
72  @staticmethod
73  def diff_lines(expected, actual):
74    expected_len = len(expected)
75    actual_len = len(actual)
76    offending_line_indexes = []
77
78    if actual_len < expected_len:
79      l = actual_len
80    else:
81      l = expected_len
82
83    for i in range(l):
84      if expected[i] != actual[i]:
85        print('ERROR: line %d is not as expected' % i)
86        print(expected[i])
87        print(actual[i])
88        offending_line_indexes.append(i)
89
90    if actual_len < expected_len:
91      print('ERROR: Missing %d lines' % (expected_len - actual_len))
92      for j in range(actual_len, expected_len):
93        print(expected[j])
94        offending_line_indexes.append(j)
95    elif actual_len > expected_len:
96      print('ERROR: Extra %d lines' % (actual_len - expected_len))
97      for k in range(expected_len, actual_len):
98        print(actual[k])
99        offending_line_indexes.append(k)
100    return offending_line_indexes
101
102
103if __name__ == '__main__':
104  unittest.main()
105