Implement auto-roll script.

tools/push-to-trunk/test_scripts.py

Index: tools/push-to-trunk/test_scripts.py
diff --git a/tools/push-to-trunk/test_scripts.py b/tools/push-to-trunk/test_scripts.py
index 9107db97ec5762a8783f21536e935df1e2aade25..f1fe46f106629bea9dd9d300e5f218232f401f91 100644
--- a/tools/push-to-trunk/test_scripts.py
+++ b/tools/push-to-trunk/test_scripts.py
@@ -34,6 +34,7 @@ import unittest
 import auto_push
 from auto_push import CheckLastPush
 from auto_push import SETTINGS_LOCATION
+import auto_roll
 import common_includes
 from common_includes import *
 import merge_to_branch
@@ -261,7 +262,7 @@ class SimpleMock(object):
     # arguments.
     if len(args) > len(expected_call['args']):
       raise NoRetryException("When calling %s with arguments, the "
-          "expectations must consist of at least as many arguments.")
+          "expectations must consist of at least as many arguments." % name)
 
     # Compare expected and actual arguments.
     for (expected_arg, actual_arg) in zip(expected_call['args'], args):
@@ -908,6 +909,70 @@ Performance and stability improvements on all platforms.""", commit)
       auto_push.AutoPush(TEST_CONFIG, self).Run(AUTO_PUSH_ARGS)
     self.assertRaises(Exception, RunAutoPush)
 
+  def testAutoRollExistingRoll(self):
+    self.ExpectReadURL([
+      URL("https://codereview.chromium.org/search",
+          "owner=author%40chromium.org&limit=30&closed=3&format=json",
+          ("{\"results\": [{\"subject\": \"different\"},"
+           "{\"subject\": \"Update V8 to Version...\"}]}")),
+    ])
+
+    result = auto_roll.AutoRoll(TEST_CONFIG, self).Run(
+        AUTO_PUSH_ARGS + ["-c", TEST_CONFIG[CHROMIUM]])
+    self.assertEquals(1, result)
+
+  # Snippet from the original DEPS file.
+  FAKE_DEPS = """
+vars = {
+  "v8_revision": "123455",
+}
+deps = {
+  "src/v8":
+    (Var("googlecode_url") % "v8") + "/" + Var("v8_branch") + "@" +
+    Var("v8_revision"),
+}
+"""
+
+  def testAutoRollUpToDate(self):
+    self.ExpectReadURL([
+      URL("https://codereview.chromium.org/search",
+          "owner=author%40chromium.org&limit=30&closed=3&format=json",
+          ("{\"results\": [{\"subject\": \"different\"}]}")),
+      URL("http://src.chromium.org/svn/trunk/src/DEPS",
+          self.FAKE_DEPS),
+    ])
+
+    self.ExpectGit([
+      Git(("log -1 --format=%H --grep="
+           "\"^Version [[:digit:]]*\.[[:digit:]]*\.[[:digit:]]* (based\" "
+           "svn/trunk"), "push_hash\n"),
+      Git("svn find-rev push_hash", "123455\n"),
+    ])
+
+    result = auto_roll.AutoRoll(TEST_CONFIG, self).Run(
+        AUTO_PUSH_ARGS + ["-c", TEST_CONFIG[CHROMIUM]])
+    self.assertEquals(1, result)
+
+  def testAutoRoll(self):
+    self.ExpectReadURL([
+      URL("https://codereview.chromium.org/search",
+          "owner=author%40chromium.org&limit=30&closed=3&format=json",
+          ("{\"results\": [{\"subject\": \"different\"}]}")),
+      URL("http://src.chromium.org/svn/trunk/src/DEPS",
+          self.FAKE_DEPS),
+    ])
+
+    self.ExpectGit([
+      Git(("log -1 --format=%H --grep="
+           "\"^Version [[:digit:]]*\.[[:digit:]]*\.[[:digit:]]* (based\" "
+           "svn/trunk"), "push_hash\n"),
+      Git("svn find-rev push_hash", "123456\n"),
+    ])
+
+    result = auto_roll.AutoRoll(TEST_CONFIG, self).Run(
+        AUTO_PUSH_ARGS + ["-c", TEST_CONFIG[CHROMIUM], "--roll"])
+    self.assertEquals(0, result)
+
   def testMergeToBranch(self):
     TEST_CONFIG[ALREADY_MERGING_SENTINEL_FILE] = self.MakeEmptyTempFile()
     TEST_CONFIG[DOT_GIT_LOCATION] = self.MakeEmptyTempFile()