Very basic starter presubmit script for Chromium, as requested by maruel....

PRESUBMIT_unittest.py

Index: PRESUBMIT_unittest.py
===================================================================
--- PRESUBMIT_unittest.py	(revision 0)
+++ PRESUBMIT_unittest.py	(revision 0)
@@ -0,0 +1,75 @@
+#!/usr/bin/python
+# Copyright (c) 2009 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 top-level Chromium presubmit script.
+"""
+
+
+import PRESUBMIT
+import unittest
+
+
+class MockInputApi(object):
+  def __init__(self):
+    self.affected_files = []
+  
+  def AffectedTextFiles(self, include_deletes=True):
+    return self.affected_files
+
+
+class MockAffectedFile(object):
+  def __init__(self, path):
+    self.path = path
+  
+  def LocalPath(self):
+    return self.path
+
+
+class MockOutputApi(object):
+  class PresubmitError(object):
+    def __init__(self, msg, items):
+      self.msg = msg
+      self.items = items
+
+
+class PresubmitUnittest(unittest.TestCase):
+  def setUp(self):
+    self.file_contents = ''
+    def MockReadFile(path):
+      self.failIf(path.endswith('notsource'))
+      return self.file_contents
+    PRESUBMIT._ReadFile = MockReadFile
+  
+  def tearDown(self):
+    PRESUBMIT._ReadFile = PRESUBMIT.ReadFile
+  
+  def testCheckNoCrLfOrTabs(self):
+    api = MockInputApi()
+    api.affected_files = [
+      MockAffectedFile('foo/blat/yoo.notsource'),
+      MockAffectedFile('foo/blat/source.h'),
+      MockAffectedFile('foo/blat/source.mm'),
+      MockAffectedFile('foo/blat/source.py'),
+    ]
+    self.file_contents = 'file with\nerror\nhere\r\nyes there'
+    self.failUnless(len(PRESUBMIT.CheckNoCrOrTabs(api, MockOutputApi)) == 1)
+    self.failUnless(
+      len(PRESUBMIT.CheckNoCrOrTabs(api, MockOutputApi)[0].items) == 3)
+    
+    self.file_contents = 'file\twith\ttabs'
+    self.failUnless(len(PRESUBMIT.CheckNoCrOrTabs(api, MockOutputApi)) == 1)
+    
+    self.file_contents = 'file\rusing\rCRs'
+    self.failUnless(len(PRESUBMIT.CheckNoCrOrTabs(api, MockOutputApi)) == 1)
+    
+    self.file_contents = 'both\ttabs and\r\nCRLF'
+    self.failUnless(len(PRESUBMIT.CheckNoCrOrTabs(api, MockOutputApi)) == 2)
+    
+    self.file_contents = 'file with\nzero \\t errors \\r\\n'
+    self.failIf(PRESUBMIT.CheckNoCrOrTabs(api, MockOutputApi))
+
+
+if __name__ == '__main__':
+  unittest.main()