Resetting metrics ids on clump detection.

chrome/browser/metrics/cloned_install_detector_unittest.cc

Index: chrome/browser/metrics/cloned_install_detector_unittest.cc
diff --git a/chrome/browser/metrics/cloned_install_detector_unittest.cc b/chrome/browser/metrics/cloned_install_detector_unittest.cc
index a50cbbf01ef280ad06200bb07cf26611dd44ed99..dcc8bf6c007d8368e3e87cb02360fc0a7dd935a6 100644
--- a/chrome/browser/metrics/cloned_install_detector_unittest.cc
+++ b/chrome/browser/metrics/cloned_install_detector_unittest.cc
@@ -6,6 +6,7 @@
 
 #include "base/prefs/testing_pref_service.h"
 #include "chrome/browser/metrics/machine_id_provider.h"
+#include "chrome/browser/metrics/metrics_service.h"
 #include "chrome/common/pref_names.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -19,7 +20,7 @@ const int kTestHashedId = 2216819;
 
 }  // namespace
 
-// TODO(jwd): Change this test to test the full flow and histogram outputs. It
+// TODO(jwd): Change these test to test the full flow and histogram outputs. It
 // should also remove the need to make the test a friend of
 // ClonedInstallDetector.
 TEST(ClonedInstallDetectorTest, SaveId) {
@@ -34,4 +35,20 @@ TEST(ClonedInstallDetectorTest, SaveId) {
   EXPECT_EQ(kTestHashedId, prefs.GetInteger(prefs::kMetricsMachineId));
 }
 
+TEST(ClonedInstallDetectorTest, DetectClone) {
+  TestingPrefServiceSimple prefs;
+  ClonedInstallDetector::RegisterPrefs(prefs.registry());
+  MetricsService::RegisterPrefs(prefs.registry());
+
+  // Save a machine id that will cause a clone to be detected.
+  prefs.SetInteger(prefs::kMetricsMachineId, kTestHashedId + 1);
+
+  scoped_ptr<ClonedInstallDetector> detector(
+      new ClonedInstallDetector(MachineIdProvider::CreateInstance()));
+
+  detector->SaveMachineId(&prefs, kTestRawId);
+
+  EXPECT_TRUE(prefs.GetBoolean(prefs::kMetricsResetIds));
+}
+
 }  // namespace metrics