metrics: Add leak detector controller in Chrome OS metrics system

chrome/browser/metrics/leak_detector_controller_unittest.cc

+// Copyright 2016 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 "chrome/browser/metrics/leak_detector_controller.h"
+
+#include <set>
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "components/metrics/proto/memory_leak_report.pb.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace metrics {
+
+// Test class for LeakDetectorController that exposes protected methods.
+class TestLeakDetectorController : public LeakDetectorController {
+ public:
+  using LeakDetectorController::OnLeakFound;
+
+  TestLeakDetectorController() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TestLeakDetectorController);
+};
+
+using LeakReport = LeakDetector::LeakReport;
+
+TEST(LeakDetectorControllerTest, SingleReport) {
+  LeakReport report;
+  report.alloc_size_bytes = 8;
+  report.call_stack = {1, 2, 3, 4};
+
+  TestLeakDetectorController controller;
+  controller.OnLeakFound(report);
+
+  std::vector<MemoryLeakReportProto> stored_reports;
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(1U, stored_reports.size());
+
+  EXPECT_EQ(8U, stored_reports[0].size_bytes());
+  ASSERT_EQ(4, stored_reports[0].call_stack().size());
+  EXPECT_EQ(1U, stored_reports[0].call_stack().Get(0));
+  EXPECT_EQ(2U, stored_reports[0].call_stack().Get(1));
+  EXPECT_EQ(3U, stored_reports[0].call_stack().Get(2));
+  EXPECT_EQ(4U, stored_reports[0].call_stack().Get(3));
+
+  // No more reports.
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(0U, stored_reports.size());
+}
+
+TEST(LeakDetectorControllerTest, MultipleReportsSeparately) {
+  TestLeakDetectorController controller;
+  std::vector<MemoryLeakReportProto> stored_reports;
+
+  // Pass in first report.
+  LeakReport report;
+  report.alloc_size_bytes = 8;
+  report.call_stack = {1, 2, 3, 4};
+
+  controller.OnLeakFound(report);
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(1U, stored_reports.size());
+
+  EXPECT_EQ(8U, stored_reports[0].size_bytes());
+  ASSERT_EQ(4, stored_reports[0].call_stack().size());
+  EXPECT_EQ(1U, stored_reports[0].call_stack().Get(0));
+  EXPECT_EQ(2U, stored_reports[0].call_stack().Get(1));
+  EXPECT_EQ(3U, stored_reports[0].call_stack().Get(2));
+  EXPECT_EQ(4U, stored_reports[0].call_stack().Get(3));
+
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(0U, stored_reports.size());
+
+  // Pass in second report.
+  report.alloc_size_bytes = 16;
+  report.call_stack = {5, 6, 7, 8, 9, 10};
+  controller.OnLeakFound(report);
+
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(1U, stored_reports.size());
+
+  EXPECT_EQ(16U, stored_reports[0].size_bytes());
+  ASSERT_EQ(6, stored_reports[0].call_stack().size());
+  EXPECT_EQ(5U, stored_reports[0].call_stack().Get(0));
+  EXPECT_EQ(6U, stored_reports[0].call_stack().Get(1));
+  EXPECT_EQ(7U, stored_reports[0].call_stack().Get(2));
+  EXPECT_EQ(8U, stored_reports[0].call_stack().Get(3));
+  EXPECT_EQ(9U, stored_reports[0].call_stack().Get(4));
+  EXPECT_EQ(10U, stored_reports[0].call_stack().Get(5));
+
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(0U, stored_reports.size());
+
+  // Pass in third report.
+  report.alloc_size_bytes = 24;
+  report.call_stack = {9, 10, 11, 12, 13, 14, 15, 16};
+  controller.OnLeakFound(report);
+
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(1U, stored_reports.size());
+
+  EXPECT_EQ(24U, stored_reports[0].size_bytes());
+  ASSERT_EQ(8, stored_reports[0].call_stack().size());
+  EXPECT_EQ(9U, stored_reports[0].call_stack().Get(0));
+  EXPECT_EQ(10U, stored_reports[0].call_stack().Get(1));
+  EXPECT_EQ(11U, stored_reports[0].call_stack().Get(2));
+  EXPECT_EQ(12U, stored_reports[0].call_stack().Get(3));
+  EXPECT_EQ(13U, stored_reports[0].call_stack().Get(4));
+  EXPECT_EQ(14U, stored_reports[0].call_stack().Get(5));
+  EXPECT_EQ(15U, stored_reports[0].call_stack().Get(6));
+  EXPECT_EQ(16U, stored_reports[0].call_stack().Get(7));
+
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(0U, stored_reports.size());
+}
+
+TEST(LeakDetectorControllerTest, MultipleReportsTogether) {
+  LeakReport report1, report2, report3;
+  report1.alloc_size_bytes = 8;
+  report1.call_stack = {1, 2, 3, 4};
+  report2.alloc_size_bytes = 16;
+  report2.call_stack = {5, 6, 7, 8, 9, 10};
+  report3.alloc_size_bytes = 24;
+  report3.call_stack = {9, 10, 11, 12, 13, 14, 15, 16};
+
+  TestLeakDetectorController controller;
+  controller.OnLeakFound(report1);
+  controller.OnLeakFound(report2);
+  controller.OnLeakFound(report3);
+
+  std::vector<MemoryLeakReportProto> stored_reports;
+
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(3U, stored_reports.size());
+
+  EXPECT_EQ(8U, stored_reports[0].size_bytes());
+  ASSERT_EQ(4, stored_reports[0].call_stack().size());
+  EXPECT_EQ(1U, stored_reports[0].call_stack().Get(0));
+  EXPECT_EQ(2U, stored_reports[0].call_stack().Get(1));
+  EXPECT_EQ(3U, stored_reports[0].call_stack().Get(2));
+  EXPECT_EQ(4U, stored_reports[0].call_stack().Get(3));
+
+  EXPECT_EQ(16U, stored_reports[1].size_bytes());
+  ASSERT_EQ(6, stored_reports[1].call_stack().size());
+  EXPECT_EQ(5U, stored_reports[1].call_stack().Get(0));
+  EXPECT_EQ(6U, stored_reports[1].call_stack().Get(1));
+  EXPECT_EQ(7U, stored_reports[1].call_stack().Get(2));
+  EXPECT_EQ(8U, stored_reports[1].call_stack().Get(3));
+  EXPECT_EQ(9U, stored_reports[1].call_stack().Get(4));
+  EXPECT_EQ(10U, stored_reports[1].call_stack().Get(5));
+
+  EXPECT_EQ(24U, stored_reports[2].size_bytes());
+  ASSERT_EQ(8, stored_reports[2].call_stack().size());
+  EXPECT_EQ(9U, stored_reports[2].call_stack().Get(0));
+  EXPECT_EQ(10U, stored_reports[2].call_stack().Get(1));
+  EXPECT_EQ(11U, stored_reports[2].call_stack().Get(2));
+  EXPECT_EQ(12U, stored_reports[2].call_stack().Get(3));
+  EXPECT_EQ(13U, stored_reports[2].call_stack().Get(4));
+  EXPECT_EQ(14U, stored_reports[2].call_stack().Get(5));
+  EXPECT_EQ(15U, stored_reports[2].call_stack().Get(6));
+  EXPECT_EQ(16U, stored_reports[2].call_stack().Get(7));
+
+  controller.GetLeakReports(&stored_reports);
+  ASSERT_EQ(0U, stored_reports.size());
+}
+
+}  // namespace metrics