RAPPOR implementation

components/variations/metrics_util_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "components/variations/metrics_util.h"
 
+#include "base/format_macros.h"
+#include "base/strings/stringprintf.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace metrics {
 
 TEST(MetricsUtilTest, HashName) {
   // Checks that hashing is stable on all platforms.
   struct {
     const char* name;
     uint32 hash_value;
   } known_hashes[] = {
     {"a", 937752454u},
     {"1", 723085877u},
     {"Trial Name", 2713117220u},
     {"Group Name", 3201815843u},
     {"My Favorite Experiment", 3722155194u},
     {"My Awesome Group Name", 4109503236u},
     {"abcdefghijklmonpqrstuvwxyz", 787728696u},
     {"0123456789ABCDEF", 348858318U}
   };
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(known_hashes); ++i)
     EXPECT_EQ(known_hashes[i].hash_value, HashName(known_hashes[i].name));
 }
 
+// Make sure our ID hashes are the same as what we see on the server side.
+TEST(MetricsUtilTest, HashMetricName) {
+  static const struct {
+    std::string input;
+    std::string output;
+  } cases[] = {
+    {"Back", "0x0557fa923dcee4d0"},
+    {"Forward", "0x67d2f6740a8eaebf"},
+    {"NewTab", "0x290eb683f96572f1"},
+  };
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(cases); ++i) {
+    uint64 hash = HashMetricName(cases[i].input);
+    std::string hash_hex = base::StringPrintf("0x%016" PRIx64, hash);
+    EXPECT_EQ(cases[i].output, hash_hex);
+  }
+}
+
 }  // namespace metrics