cc/metrics/jank_injector_unittest.cc

   1 // Copyright 2021 The Chromium Authors
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/metrics/jank_injector.h"
   6
   7 #include <string>
   8
   9 #include "base/test/scoped_feature_list.h"
  10 #include "base/test/test_simple_task_runner.h"
  11 #include "base/time/time.h"
  12 #include "testing/gtest/include/gtest/gtest.h"
  13
  14 namespace cc {
  15 namespace {
  16
  17 class JankInjectorTest : public testing::Test {
  18  public:
  19   JankInjectorTest() = default;
  20   ~JankInjectorTest() override = default;
  21 };
  22
  23 TEST_F(JankInjectorTest, Basic) {
  24   base::test::ScopedFeatureList features;
  25   features.InitFromCommandLine("JankInjectionAblation:cluster/4/percent/10",
  26                                std::string());
  27
  28   scoped_refptr<base::TestSimpleTaskRunner> task_runner(
  29       new base::TestSimpleTaskRunner());
  30
  31   ScopedJankInjectionEnabler enable_jank;
  32   JankInjector injector;
  33   const auto& config = injector.config();
  34   EXPECT_EQ(config.target_dropped_frames_percent, 10u);
  35   EXPECT_EQ(config.dropped_frame_cluster_size, 4u);
  36
  37   const uint32_t kSourceId = 1;
  38   uint32_t sequence_number = 1;
  39   constexpr base::TimeDelta kInterval = base::Milliseconds(16);
  40   base::TimeTicks frame_time = base::TimeTicks::Now();
  41   base::TimeTicks deadline = frame_time + kInterval;
  42
  43   auto args = viz::BeginFrameArgs::Create(
  44       BEGINFRAME_FROM_HERE, kSourceId, ++sequence_number, frame_time, deadline,
  45       kInterval, viz::BeginFrameArgs::NORMAL);
  46   // For the first frame, no janks scheduled.
  47   injector.ScheduleJankIfNeeded(args, task_runner.get());
  48   EXPECT_FALSE(task_runner->HasPendingTask());
  49
  50   // Generate over 100 frames. This should cause jank to be injected 3 times.
  51   for (uint32_t count = 0; count < 100; ++count) {
  52     args.frame_time += kInterval;
  53     args.deadline += kInterval;
  54     ++args.frame_id.sequence_number;
  55     injector.ScheduleJankIfNeeded(args, task_runner.get());
  56   }
  57
  58   // Jank should be injected 3 times for the 100 frames.
  59   EXPECT_EQ(task_runner->NumPendingTasks(), 3u);
  60 }
  61
  62 }  // namespace
  63 }  // namespace cc