Add git-number script to calculate generation numbers for commits.

tests/git_common_test.py

Index: tests/git_common_test.py
diff --git a/tests/git_common_test.py b/tests/git_common_test.py
new file mode 100755
index 0000000000000000000000000000000000000000..c5f3e416b4ac7fa87f7032713404e6da46718cc7
--- /dev/null
+++ b/tests/git_common_test.py
@@ -0,0 +1,280 @@
+#!/usr/bin/env python
+# Copyright (c) 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Unit tests for git_common.py"""
+
+import binascii
+import collections
+import os
+import signal
+import sys
+import tempfile
+import time
+import unittest
+
+DEPOT_TOOLS_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+sys.path.insert(0, DEPOT_TOOLS_ROOT)
+
+from testing_support import git_test_utils

[M-A Ruel, 2013/11/17 19:54:58]

sort

[iannucci, 2013/11/18 05:38:56]

Dangit! Why don't we have pylint do this....

+from testing_support import coverage_utils
+
+
+class GitCommonTestBase(unittest.TestCase):
+  @classmethod
+  def setUpClass(cls):
+    super(GitCommonTestBase, cls).setUpClass()
+    import git_common
+    cls.gc = git_common
+
+
+class Support(GitCommonTestBase):
+  def _testMemoizeOneBody(self, threadsafe):
+    calls = collections.defaultdict(int)
+    def double_if_even(val):
+      calls[val] += 1
+      return val * 2 if val % 2 == 0 else None
+    # Use this explicitly as a wrapper fn instead of a decorator. Otherwise
+    # pylint crashes (!!)
+    double_if_even = self.gc.memoize_one(threadsafe=threadsafe)(double_if_even)
+
+    self.assertEqual(4, double_if_even(2))
+    self.assertEqual(4, double_if_even(2))
+    self.assertEqual(None, double_if_even(1))
+    self.assertEqual(None, double_if_even(1))
+    self.assertDictEqual({1: 2, 2: 1}, calls)
+
+    double_if_even.set(10, 20)
+    self.assertEqual(20, double_if_even(10))
+    self.assertDictEqual({1: 2, 2: 1}, calls)
+
+    double_if_even.clear()
+    self.assertEqual(4, double_if_even(2))
+    self.assertEqual(4, double_if_even(2))
+    self.assertEqual(None, double_if_even(1))
+    self.assertEqual(None, double_if_even(1))
+    self.assertEqual(20, double_if_even(10))
+    self.assertDictEqual({1: 4, 2: 2, 10: 1}, calls)
+
+  def testMemoizeOne(self):
+    self._testMemoizeOneBody(threadsafe=False)
+
+  def testMemoizeOneThreadsafe(self):
+    self._testMemoizeOneBody(threadsafe=True)
+
+
+def slow_square(i):
+  """Helper for ScopedPoolTest.
+
+  Must be global because non top-level functions aren't pickleable.
+  """
+  time.sleep(0.2)
+  return i ** 2
+
+
+class ScopedPoolTest(GitCommonTestBase):
+  if sys.platform.startswith('win'):
+    CTRL_C = signal.CTRL_C_EVENT
+  else:
+    CTRL_C = signal.SIGINT

[M-A Ruel, 2013/11/17 19:54:58]

CTRL_C = signal.CTRL_C_EVENT if sys.platform == 'win32' else signal.SIGINT

'win64' is never going to be a platform. I can't find the relevant bug report on
bugs.python.org though.

[iannucci, 2013/11/18 05:38:56]

Yeah, I know... it's weird. Done.

+
+  def testThreads(self):
+    result = []
+    with self.gc.ScopedPool(kind='threads') as pool:
+      for i in pool.imap(slow_square, xrange(10)):

[M-A Ruel, 2013/11/17 19:54:58]

result = list(pool.imap(slow_square, xrange(10)))

[iannucci, 2013/11/18 05:38:56]

Lol, done.

+        result.append(i)
+    self.assertEqual([0, 1, 4, 9, 16, 25, 36, 49, 64, 81], result)
+
+  def testThreadsCtrlC(self):
+    result = []
+    with self.assertRaises(KeyboardInterrupt):
+      with self.gc.ScopedPool(kind='threads') as pool:
+        # Make sure this pool is interrupted in mid-swing
+        for i in pool.imap(slow_square, xrange(1000000)):

[M-A Ruel, 2013/11/17 19:54:58]

One thing I prefer is to use a list of threading.Event, then signal half og the
items in the list. This is faster and more deterministic than using sleep. I'd
highly prefer if this whole test executable didn't use time.sleep() at all.

[iannucci, 2013/11/18 05:38:56]

Tried it. Surprise! Python signal-handling is broken:
http://bytes.com/topic/python/answers/802572-waiting-event-blocks-all-signals

+          if i > 32:
+            os.kill(os.getpid(), self.CTRL_C)
+          result.append(i)
+    self.assertEqual([0, 1, 4, 9, 16, 25], result)
+
+  def testProcs(self):
+    result = []
+    with self.gc.ScopedPool() as pool:
+      for i in pool.imap(slow_square, xrange(10)):

[M-A Ruel, 2013/11/17 19:54:58]

same

[iannucci, 2013/11/18 05:38:56]

Done.

+        result.append(i)
+    self.assertEqual([0, 1, 4, 9, 16, 25, 36, 49, 64, 81], result)
+
+  def testProcsCtrlC(self):
+    result = []
+    with self.assertRaises(KeyboardInterrupt):
+      with self.gc.ScopedPool() as pool:
+        # Make sure this pool is interrupted in mid-swing
+        for i in pool.imap(slow_square, xrange(1000000)):
+          if i > 32:
+            os.kill(os.getpid(), self.CTRL_C)
+          result.append(i)
+    self.assertEqual([0, 1, 4, 9, 16, 25], result)
+
+
+class ProgressPrinterTest(GitCommonTestBase):
+  class FakeStream(object):
+    def __init__(self):
+      self.data = set()
+      self.count = 0
+
+    def write(self, line):
+      self.data.add(line)
+
+    def flush(self):
+      self.count += 1
+
+  @unittest.expectedFailure
+  def testBasic(self):
+    """This test is probably racy, but I don't have a better alternative."""
+    fmt = '%(count)d/10'
+    stream = self.FakeStream()
+
+    pp = self.gc.ProgressPrinter(fmt, enabled=True, stream=stream, period=0.01)
+    with pp as inc:
+      for _ in xrange(10):
+        time.sleep(0.02)
+        inc()
+
+    filtered = set(x.strip() for x in stream.data)
+    rslt = set(fmt % {'count': i} for i in xrange(11))
+    self.assertSetEqual(filtered, rslt)
+    self.assertGreaterEqual(stream.count, 10)
+
+
+class GitReadOnlyFunctionsTest(git_test_utils.GitRepoReadOnlyTestBase,
+                               GitCommonTestBase):
+  REPO = """
+  A B C D
+    B E D
+  """
+
+  COMMIT_A = {
+    'some/files/file1': {'data': 'file1'},
+    'some/files/file2': {'data': 'file2'},
+    'some/files/file3': {'data': 'file3'},
+    'some/other/file':  {'data': 'otherfile'},
+  }
+
+  COMMIT_C = {
+    'some/files/file2': {
+      'mode': 0755,
+      'data': 'file2 - vanilla'},
+  }
+
+  COMMIT_E = {
+    'some/files/file2': {'data': 'file2 - merged'},
+  }
+
+  COMMIT_D = {
+    'some/files/file2': {'data': 'file2 - vanilla\nfile2 - merged'},
+  }
+
+  def testHashes(self):
+    ret = self.repo.run(
+      self.gc.hashes, *[
+        'master',
+        'master~3',
+        self.repo['E']+'~',
+        self.repo['D']+'^2',
+        'tag_C^{}',
+      ]
+    )
+    self.assertEqual([
+      self.repo['D'],
+      self.repo['A'],
+      self.repo['B'],
+      self.repo['E'],
+      self.repo['C'],
+    ], ret)
+
+  def testParseCommitrefs(self):
+    ret = self.repo.run(
+      self.gc.parse_commitrefs, *[
+        'master',
+        'master~3',
+        self.repo['E']+'~',
+        self.repo['D']+'^2',
+        'tag_C^{}',
+      ]
+    )
+    self.assertEqual(ret, map(binascii.unhexlify, [
+      self.repo['D'],
+      self.repo['A'],
+      self.repo['B'],
+      self.repo['E'],
+      self.repo['C'],
+    ]))
+
+    with self.assertRaisesRegexp(Exception, r"one of \('master', 'bananas'\)"):
+      self.repo.run(self.gc.parse_commitrefs, 'master', 'bananas')
+
+  def testTree(self):
+    tree = self.repo.run(self.gc.tree, 'master:some/files')
+    file1 = self.COMMIT_A['some/files/file1']['data']
+    file2 = self.COMMIT_D['some/files/file2']['data']
+    file3 = self.COMMIT_A['some/files/file3']['data']
+    self.assertEquals(tree['file1'],
+                      ('100644', 'blob', git_test_utils.git_hash_data(file1)))
+    self.assertEquals(tree['file2'],
+                      ('100755', 'blob', git_test_utils.git_hash_data(file2)))
+    self.assertEquals(tree['file3'],
+                      ('100644', 'blob', git_test_utils.git_hash_data(file3)))
+
+    tree = self.repo.run(self.gc.tree, 'master:some')
+    self.assertEquals(len(tree), 2)
+    # Don't check the tree hash because we're lazy :)
+    self.assertEquals(tree['files'][:2], ('040000', 'tree'))
+
+    tree = self.repo.run(self.gc.tree, 'master:wat')
+    self.assertEqual(tree, None)
+
+  def testTreeRecursive(self):
+    tree = self.repo.run(self.gc.tree, 'master:some', recurse=True)
+    file1 = self.COMMIT_A['some/files/file1']['data']
+    file2 = self.COMMIT_D['some/files/file2']['data']
+    file3 = self.COMMIT_A['some/files/file3']['data']
+    other = self.COMMIT_A['some/other/file']['data']
+    self.assertEquals(tree['files/file1'],
+                      ('100644', 'blob', git_test_utils.git_hash_data(file1)))
+    self.assertEquals(tree['files/file2'],
+                      ('100755', 'blob', git_test_utils.git_hash_data(file2)))
+    self.assertEquals(tree['files/file3'],
+                      ('100644', 'blob', git_test_utils.git_hash_data(file3)))
+    self.assertEquals(tree['other/file'],
+                      ('100644', 'blob', git_test_utils.git_hash_data(other)))
+
+
+class GitMutableFunctionsTest(git_test_utils.GitRepoReadWriteTestBase,
+                              GitCommonTestBase):
+  REPO = ''
+
+  def _intern_data(self, data):
+    with tempfile.TemporaryFile() as f:
+      f.write(data)
+      f.seek(0)
+      return self.repo.run(self.gc.intern_f, f)
+
+  def testInternF(self):
+    data = 'CoolBobcatsBro'
+    data_hash = self._intern_data(data)
+    self.assertEquals(git_test_utils.git_hash_data(data), data_hash)
+    self.assertEquals(data, self.repo.git('cat-file', 'blob', data_hash).stdout)
+
+  def testMkTree(self):
+    tree = {}
+    for i in 1, 2, 3:
+      name = 'file%d' % i
+      tree[name] = ('100644', 'blob', self._intern_data(name))
+    tree_hash = self.repo.run(self.gc.mktree, tree)
+    self.assertEquals('37b61866d6e061c4ba478e7eb525be7b5752737d', tree_hash)
+
+
+if __name__ == '__main__':
+  sys.exit(coverage_utils.covered_main(
+    os.path.join(DEPOT_TOOLS_ROOT, 'git_common.py')
+  ))