1 files changed, 91 insertions, 0 deletions
diff --git a/chromium/v8/tools/unittests/v8_presubmit_test.py b/chromium/v8/tools/unittests/v8_presubmit_test.py
new file mode 100755
index 00000000000..2c66d1891b8
--- /dev/null
+++ b/chromium/v8/tools/unittests/v8_presubmit_test.py
@@ -0,0 +1,91 @@
+#!/usr/bin/env python
+# Copyright 2018 the V8 project authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import sys
+import tempfile
+import unittest
+
+# Configuring the path for the v8_presubmit module
+TOOLS_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
+sys.path.append(TOOLS_ROOT)
+
+from v8_presubmit import FileContentsCache, CacheableSourceFileProcessor
+
+
+class FakeCachedProcessor(CacheableSourceFileProcessor):
+  def __init__(self, cache_file_path):
+    super(FakeCachedProcessor, self).__init__(
+      use_cache=True, cache_file_path=cache_file_path, file_type='.test')
+  def GetProcessorWorker(self):
+    return object
+  def GetProcessorScript(self):
+    return "echo", []
+  def DetectUnformattedFiles(_, cmd, worker, files):
+    raise NotImplementedError
+
+class FileContentsCacheTest(unittest.TestCase):
+  def setUp(self):
+    _, self.cache_file_path = tempfile.mkstemp()
+    cache = FileContentsCache(self.cache_file_path)
+    cache.Load()
+
+    def generate_file():
+      _, file_name = tempfile.mkstemp()
+      with open(file_name, "w") as f:
+        f.write(file_name)
+
+      return file_name
+
+    self.target_files = [generate_file() for _ in range(2)]
+    unchanged_files = cache.FilterUnchangedFiles(self.target_files)
+    self.assertEqual(len(unchanged_files), 2)
+    cache.Save()
+
+  def tearDown(self):
+    for file in [self.cache_file_path] + self.target_files:
+      os.remove(file)
+
+  def testCachesFiles(self):
+    cache = FileContentsCache(self.cache_file_path)
+    cache.Load()
+
+    changed_files = cache.FilterUnchangedFiles(self.target_files)
+    self.assertListEqual(changed_files, [])
+
+    modified_file = self.target_files[0]
+    with open(modified_file, "w") as f:
+      f.write("modification")
+
+    changed_files = cache.FilterUnchangedFiles(self.target_files)
+    self.assertListEqual(changed_files, [modified_file])
+
+  def testCacheableSourceFileProcessor(self):
+    class CachedProcessor(FakeCachedProcessor):
+      def DetectFilesToChange(_, files):
+        self.assertListEqual(files, [])
+        return []
+
+    cached_processor = CachedProcessor(cache_file_path=self.cache_file_path)
+    cached_processor.ProcessFiles(self.target_files)
+
+  def testCacheableSourceFileProcessorWithModifications(self):
+    modified_file = self.target_files[0]
+    with open(modified_file, "w") as f:
+      f.write("modification")
+
+    class CachedProcessor(FakeCachedProcessor):
+      def DetectFilesToChange(_, files):
+        self.assertListEqual(files, [modified_file])
+        return []
+
+    cached_processor = CachedProcessor(
+      cache_file_path=self.cache_file_path,
+    )
+    cached_processor.ProcessFiles(self.target_files)
+
+
+if __name__ == '__main__':
+  unittest.main()