1#!/usr/bin/env python3
2# -*- coding: utf-8 -*-
3# Copyright 2019 The Chromium OS Authors. All rights reserved.
4# Use of this source code is governed by a BSD-style license that can be
5# found in the LICENSE file.
6
7"""Unit tests for retrieving the LLVM hash."""
8
9from __future__ import print_function
10
11import subprocess
12import unittest
13import unittest.mock as mock
14
15import get_llvm_hash
16from get_llvm_hash import LLVMHash
17
18# We grab protected stuff from get_llvm_hash. That's OK.
19# pylint: disable=protected-access
20
21
22def MakeMockPopen(return_code):
23
24  def MockPopen(*_args, **_kwargs):
25    result = mock.MagicMock()
26    result.returncode = return_code
27
28    communicate_result = result.communicate.return_value
29    # Communicate returns stdout, stderr.
30    communicate_result.__iter__.return_value = (None, 'some stderr')
31    return result
32
33  return MockPopen
34
35
36class TestGetLLVMHash(unittest.TestCase):
37  """The LLVMHash test class."""
38
39  @mock.patch.object(subprocess, 'Popen')
40  def testCloneRepoSucceedsWhenGitSucceeds(self, popen_mock):
41    popen_mock.side_effect = MakeMockPopen(return_code=0)
42    llvm_hash = LLVMHash()
43
44    into_tempdir = '/tmp/tmpTest'
45    llvm_hash.CloneLLVMRepo(into_tempdir)
46    popen_mock.assert_called_with(
47        ['git', 'clone', get_llvm_hash._LLVM_GIT_URL, into_tempdir],
48        stderr=subprocess.PIPE)
49
50  @mock.patch.object(subprocess, 'Popen')
51  def testCloneRepoFailsWhenGitFails(self, popen_mock):
52    popen_mock.side_effect = MakeMockPopen(return_code=1)
53
54    with self.assertRaises(ValueError) as err:
55      LLVMHash().CloneLLVMRepo('/tmp/tmp1')
56
57    self.assertIn('Failed to clone', str(err.exception.args))
58    self.assertIn('some stderr', str(err.exception.args))
59
60  @mock.patch.object(get_llvm_hash, 'GetGitHashFrom')
61  def testGetGitHashWorks(self, mock_get_git_hash):
62    mock_get_git_hash.return_value = 'a13testhash2'
63
64    self.assertEqual(
65        get_llvm_hash.GetGitHashFrom('/tmp/tmpTest', 100), 'a13testhash2')
66
67    mock_get_git_hash.assert_called_once()
68
69  @mock.patch.object(LLVMHash, 'GetLLVMHash')
70  @mock.patch.object(get_llvm_hash, 'GetGoogle3LLVMVersion')
71  def testReturnGoogle3LLVMHash(self, mock_google3_llvm_version,
72                                mock_get_llvm_hash):
73    mock_get_llvm_hash.return_value = 'a13testhash3'
74    mock_google3_llvm_version.return_value = 1000
75    self.assertEqual(LLVMHash().GetGoogle3LLVMHash(), 'a13testhash3')
76    mock_get_llvm_hash.assert_called_once_with(1000)
77
78  @mock.patch.object(LLVMHash, 'GetLLVMHash')
79  @mock.patch.object(get_llvm_hash, 'GetGoogle3LLVMVersion')
80  def testReturnGoogle3UnstableLLVMHash(self, mock_google3_llvm_version,
81                                        mock_get_llvm_hash):
82    mock_get_llvm_hash.return_value = 'a13testhash3'
83    mock_google3_llvm_version.return_value = 1000
84    self.assertEqual(LLVMHash().GetGoogle3UnstableLLVMHash(), 'a13testhash3')
85    mock_get_llvm_hash.assert_called_once_with(1000)
86
87  @mock.patch.object(subprocess, 'check_output')
88  def testSuccessfullyGetGitHashFromToTOfLLVM(self, mock_check_output):
89    mock_check_output.return_value = 'a123testhash1 path/to/main\n'
90    self.assertEqual(LLVMHash().GetTopOfTrunkGitHash(), 'a123testhash1')
91    mock_check_output.assert_called_once()
92
93
94if __name__ == '__main__':
95  unittest.main()
96