RAPPOR implementation

components/rappor/rappor_service_unittest.cc

+// Copyright 2014 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/rappor/rappor_service.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace rappor {
+
+class TestRapporService : public RapporService {
+ public:
+  void GetReports(RapporReports* reports) {
+    LogMetrics(reports);
+  }
+  void TestRecordSample(const std::string& metric_name,
+                        const RapporParameters& parameters,
+                        const std::string& sample) {
+    RecordSampleInternal(metric_name, parameters, sample);
+  }
+  void SetCohort(uint32_t cohort) {

[Alexei Svitkine (slow), 2014/02/05 18:07:01]

I'd just name this SetCohortForTesting() and put it into the RapporService
class.

[Steven Holte, 2014/02/05 22:44:37]

Done.

+    cohort_ = cohort;
+  }
+};
+
+TEST(RapporServiceTest, RapporMetrics) {
+  const RapporParameters kTestRapporParameters = {
+      16 /* Bloom filter size bytes */,
+      4 /* Bloom filter hash count */,
+      PROBABILITY_75 /* Fake data probability */,
+      PROBABILITY_50 /* Fake one probability */,
+      PROBABILITY_75 /* One coin probability */,
+      PROBABILITY_50 /* Zero coin probability */
+  };
+
+  TestRapporService rappor_service;
+  rappor_service.SetCohort(0);
+
+  rappor_service.TestRecordSample("MyRappor", kTestRapporParameters, "foo");
+  rappor_service.TestRecordSample("MyRappor", kTestRapporParameters, "bar");
+
+  RapporReports reports;
+  rappor_service.GetReports(&reports);
+  EXPECT_EQ(1, reports.report_size());
+
+  const RapporReports::Report& report = reports.report(0);
+  EXPECT_TRUE(report.name_hash());
+  EXPECT_EQ(16u, report.bits().size());
+}
+
+}  // namespace rappor