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// 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 "base/trace_event/trace_event_synthetic_delay.h"
#include <stdint.h>
#include "base/macros.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
namespace trace_event {
namespace {
const int kTargetDurationMs = 100;
// Allow some leeway in timings to make it possible to run these tests with a
// wall clock time source too.
const int kShortDurationMs = 10;
} // namespace
class TraceEventSyntheticDelayTest : public testing::Test,
public TraceEventSyntheticDelayClock {
public:
TraceEventSyntheticDelayTest() {}
~TraceEventSyntheticDelayTest() override { ResetTraceEventSyntheticDelays(); }
// TraceEventSyntheticDelayClock implementation.
base::TimeTicks Now() override {
AdvanceTime(base::TimeDelta::FromMilliseconds(kShortDurationMs / 10));
return now_;
}
TraceEventSyntheticDelay* ConfigureDelay(const char* name) {
TraceEventSyntheticDelay* delay = TraceEventSyntheticDelay::Lookup(name);
delay->SetClock(this);
delay->SetTargetDuration(
base::TimeDelta::FromMilliseconds(kTargetDurationMs));
return delay;
}
void AdvanceTime(base::TimeDelta delta) { now_ += delta; }
int64_t TestFunction() {
base::TimeTicks start = Now();
{ TRACE_EVENT_SYNTHETIC_DELAY("test.Delay"); }
return (Now() - start).InMilliseconds();
}
int64_t AsyncTestFunctionBegin() {
base::TimeTicks start = Now();
{ TRACE_EVENT_SYNTHETIC_DELAY_BEGIN("test.AsyncDelay"); }
return (Now() - start).InMilliseconds();
}
int64_t AsyncTestFunctionEnd() {
base::TimeTicks start = Now();
{ TRACE_EVENT_SYNTHETIC_DELAY_END("test.AsyncDelay"); }
return (Now() - start).InMilliseconds();
}
private:
base::TimeTicks now_;
DISALLOW_COPY_AND_ASSIGN(TraceEventSyntheticDelayTest);
};
TEST_F(TraceEventSyntheticDelayTest, StaticDelay) {
TraceEventSyntheticDelay* delay = ConfigureDelay("test.Delay");
delay->SetMode(TraceEventSyntheticDelay::STATIC);
EXPECT_GE(TestFunction(), kTargetDurationMs);
}
TEST_F(TraceEventSyntheticDelayTest, OneShotDelay) {
TraceEventSyntheticDelay* delay = ConfigureDelay("test.Delay");
delay->SetMode(TraceEventSyntheticDelay::ONE_SHOT);
EXPECT_GE(TestFunction(), kTargetDurationMs);
EXPECT_LT(TestFunction(), kShortDurationMs);
delay->SetTargetDuration(
base::TimeDelta::FromMilliseconds(kTargetDurationMs));
EXPECT_GE(TestFunction(), kTargetDurationMs);
}
TEST_F(TraceEventSyntheticDelayTest, AlternatingDelay) {
TraceEventSyntheticDelay* delay = ConfigureDelay("test.Delay");
delay->SetMode(TraceEventSyntheticDelay::ALTERNATING);
EXPECT_GE(TestFunction(), kTargetDurationMs);
EXPECT_LT(TestFunction(), kShortDurationMs);
EXPECT_GE(TestFunction(), kTargetDurationMs);
EXPECT_LT(TestFunction(), kShortDurationMs);
}
TEST_F(TraceEventSyntheticDelayTest, AsyncDelay) {
ConfigureDelay("test.AsyncDelay");
EXPECT_LT(AsyncTestFunctionBegin(), kShortDurationMs);
EXPECT_GE(AsyncTestFunctionEnd(), kTargetDurationMs / 2);
}
TEST_F(TraceEventSyntheticDelayTest, AsyncDelayExceeded) {
ConfigureDelay("test.AsyncDelay");
EXPECT_LT(AsyncTestFunctionBegin(), kShortDurationMs);
AdvanceTime(base::TimeDelta::FromMilliseconds(kTargetDurationMs));
EXPECT_LT(AsyncTestFunctionEnd(), kShortDurationMs);
}
TEST_F(TraceEventSyntheticDelayTest, AsyncDelayNoActivation) {
ConfigureDelay("test.AsyncDelay");
EXPECT_LT(AsyncTestFunctionEnd(), kShortDurationMs);
}
TEST_F(TraceEventSyntheticDelayTest, AsyncDelayNested) {
ConfigureDelay("test.AsyncDelay");
EXPECT_LT(AsyncTestFunctionBegin(), kShortDurationMs);
EXPECT_LT(AsyncTestFunctionBegin(), kShortDurationMs);
EXPECT_LT(AsyncTestFunctionEnd(), kShortDurationMs);
EXPECT_GE(AsyncTestFunctionEnd(), kTargetDurationMs / 2);
}
TEST_F(TraceEventSyntheticDelayTest, AsyncDelayUnbalanced) {
ConfigureDelay("test.AsyncDelay");
EXPECT_LT(AsyncTestFunctionBegin(), kShortDurationMs);
EXPECT_GE(AsyncTestFunctionEnd(), kTargetDurationMs / 2);
EXPECT_LT(AsyncTestFunctionEnd(), kShortDurationMs);
EXPECT_LT(AsyncTestFunctionBegin(), kShortDurationMs);
EXPECT_GE(AsyncTestFunctionEnd(), kTargetDurationMs / 2);
}
TEST_F(TraceEventSyntheticDelayTest, ResetDelays) {
ConfigureDelay("test.Delay");
ResetTraceEventSyntheticDelays();
EXPECT_LT(TestFunction(), kShortDurationMs);
}
TEST_F(TraceEventSyntheticDelayTest, BeginParallel) {
TraceEventSyntheticDelay* delay = ConfigureDelay("test.AsyncDelay");
base::TimeTicks end_times[2];
base::TimeTicks start_time = Now();
delay->BeginParallel(&end_times[0]);
EXPECT_FALSE(end_times[0].is_null());
delay->BeginParallel(&end_times[1]);
EXPECT_FALSE(end_times[1].is_null());
delay->EndParallel(end_times[0]);
EXPECT_GE((Now() - start_time).InMilliseconds(), kTargetDurationMs);
start_time = Now();
delay->EndParallel(end_times[1]);
EXPECT_LT((Now() - start_time).InMilliseconds(), kShortDurationMs);
}
} // namespace trace_event
} // namespace base
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