Provision to start base::SimpleTestTickClock at initial ticks

cc/test/ordered_simple_task_runner_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 <string>
 
 #include "base/cancelable_callback.h"
 #include "base/format_macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
@@ skipping 277 matching lines @@
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunUntilIdle(), "");
 }
 
 TEST_F(OrderedSimpleTaskRunnerTest, RunUntilTimeAutoNow) {
   PostTaskWhichPostsInstantTask(1, base::TimeDelta());
   PostTaskWhichPostsInstantTask(2, base::TimeDelta::FromMilliseconds(2));
   PostTaskWhichPostsInstantTask(3, base::TimeDelta::FromMilliseconds(3));
 
   task_runner_->SetAutoAdvanceNowToPendingTasks(true);
 
-  base::TimeTicks run_at = base::TimeTicks();
+  // SimpleTestTickClock starts at 1 microsecond
+  base::TimeTicks run_at =
+      base::TimeTicks() + base::TimeDelta::FromMicroseconds(1);
 
   run_at += base::TimeDelta::FromMilliseconds(2);
   RUN_AND_CHECK_RESULT(
       EXPECT_TRUE, RunUntilTime(run_at), "1(0ms) -1(0ms) 2(2ms) -2(2ms)");
   EXPECT_EQ(run_at, now_src_->NowTicks());
 
   run_at += base::TimeDelta::FromMilliseconds(1);
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunUntilTime(run_at), "3(3ms) -3(3ms)");
   EXPECT_EQ(run_at, now_src_->NowTicks());
 
   run_at += base::TimeDelta::FromMilliseconds(1);
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunUntilTime(run_at), "");
   EXPECT_EQ(run_at, now_src_->NowTicks());
 }
 
 TEST_F(OrderedSimpleTaskRunnerTest, RunUntilTimeManualNow) {
   PostTaskWhichPostsInstantTask(1, base::TimeDelta());
   PostTaskWhichPostsInstantTask(2, base::TimeDelta::FromMilliseconds(2));
   PostTaskWhichPostsInstantTask(3, base::TimeDelta::FromMilliseconds(3));
 
   task_runner_->SetAutoAdvanceNowToPendingTasks(false);
 
-  base::TimeTicks run_at = base::TimeTicks();
+  // SimpleTestTickClock starts at 1 microsecond
+  base::TimeTicks run_at =
+      base::TimeTicks() + base::TimeDelta::FromMicroseconds(1);
 
   run_at += base::TimeDelta::FromMilliseconds(2);
   RUN_AND_CHECK_RESULT(
       EXPECT_TRUE, RunUntilTime(run_at), "1(2ms) 2(2ms) -1(2ms) -2(2ms)");
   EXPECT_EQ(run_at, now_src_->NowTicks());
 
   run_at += base::TimeDelta::FromMilliseconds(1);
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunUntilTime(run_at), "3(3ms) -3(3ms)");
   EXPECT_EQ(run_at, now_src_->NowTicks());
 
   run_at += base::TimeDelta::FromMilliseconds(1);
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunUntilTime(run_at), "");
   EXPECT_EQ(run_at, now_src_->NowTicks());
 }
 
 TEST_F(OrderedSimpleTaskRunnerTest, RunForPeriod) {
   PostTaskWhichPostsInstantTask(1, base::TimeDelta());
   PostTaskWhichPostsInstantTask(2, base::TimeDelta::FromMilliseconds(2));
   PostTaskWhichPostsInstantTask(3, base::TimeDelta::FromMilliseconds(3));
 
   RUN_AND_CHECK_RESULT(EXPECT_TRUE,
                        RunForPeriod(base::TimeDelta::FromMilliseconds(2)),
                        "1(0ms) -1(0ms) 2(2ms) -2(2ms)");
-  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(2),
+  // SimpleTestTickClock starts at 1 microsecond
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                base::TimeDelta::FromMilliseconds(2),
             now_src_->NowTicks());
 
   RUN_AND_CHECK_RESULT(EXPECT_FALSE,
                        RunForPeriod(base::TimeDelta::FromMilliseconds(1)),
                        "3(3ms) -3(3ms)");
-  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(3),
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                base::TimeDelta::FromMilliseconds(3),
             now_src_->NowTicks());
 
   RUN_AND_CHECK_RESULT(
       EXPECT_FALSE, RunForPeriod(base::TimeDelta::FromMilliseconds(1)), "");
-  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(4),
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                base::TimeDelta::FromMilliseconds(4),
             now_src_->NowTicks());
 }
 
 TEST_F(OrderedSimpleTaskRunnerTest, RunTasksWhileWithCallback) {
   base::Callback<bool(void)> return_true = base::Bind(&ReturnTrue);
   base::Callback<bool(void)> return_false = base::Bind(&ReturnFalse);
 
   PostTask(1, base::TimeDelta());
 
   RUN_AND_CHECK_RESULT(EXPECT_TRUE, RunTasksWhile(return_false), "");
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunTasksWhile(return_true), "1(0ms)");
 }
 
 TEST_F(OrderedSimpleTaskRunnerTest, EmptyTaskList) {
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunPendingTasks(), "");
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunUntilIdle(), "");
 
-  ASSERT_EQ(base::TimeTicks(), now_src_->NowTicks());
+  // SimpleTestTickClock starts at 1 microsecond
+  ASSERT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1),
+            now_src_->NowTicks());
 
   RUN_AND_CHECK_RESULT(
       EXPECT_FALSE, RunUntilTime(base::TimeTicks::FromInternalValue(100)), "");
   EXPECT_EQ(base::TimeTicks::FromInternalValue(100), now_src_->NowTicks());
 
   RUN_AND_CHECK_RESULT(
       EXPECT_FALSE, RunForPeriod(base::TimeDelta::FromInternalValue(100)), "");
   EXPECT_EQ(base::TimeTicks::FromInternalValue(200), now_src_->NowTicks());
 
   base::Callback<bool(void)> return_true = base::Bind(&ReturnTrue);
@@ skipping 25 matching lines @@
   RUN_AND_CHECK_RESULT(EXPECT_TRUE, RunUntilIdle(), "1(3ms) 1(6ms) 1(9ms)");
 
   task_runner_->SetRunTaskLimit(2);
   RUN_AND_CHECK_RESULT(EXPECT_TRUE, RunUntilIdle(), "1(12ms) 1(15ms)");
 
   task_runner_->SetRunTaskLimit(0);
   RUN_AND_CHECK_RESULT(EXPECT_TRUE, RunUntilIdle(), "");
 }
 
 TEST_F(OrderedSimpleTaskRunnerTest, RunUntilTimeout) {
-  base::TimeTicks run_to = base::TimeTicks() + base::TimeDelta::FromSeconds(1);
+  // SimpleTestTickClock starts at 1 microsecond
+  base::TimeTicks run_to = base::TimeTicks() +
+                           base::TimeDelta::FromMicroseconds(1) +
+                           base::TimeDelta::FromSeconds(1);
 
   PostTask(1, base::TimeDelta::FromMilliseconds(1));
   PostTask(2, base::TimeDelta::FromMilliseconds(2));
   PostTask(3, base::TimeDelta::FromMilliseconds(3));
   PostTask(4, base::TimeDelta::FromMilliseconds(4));
   PostTask(5, base::TimeDelta::FromMilliseconds(5));
 
-  EXPECT_EQ(base::TimeTicks(), now_src_->NowTicks());
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1),
+            now_src_->NowTicks());
   task_runner_->SetRunTaskLimit(3);
   RUN_AND_CHECK_RESULT(
       EXPECT_TRUE, RunUntilTime(run_to), "1(1ms) 2(2ms) 3(3ms)");
-  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMilliseconds(3),
+  EXPECT_EQ(base::TimeTicks() + base::TimeDelta::FromMicroseconds(1) +
+                base::TimeDelta::FromMilliseconds(3),
             now_src_->NowTicks());
 
   task_runner_->SetRunTaskLimit(0);
   RUN_AND_CHECK_RESULT(EXPECT_TRUE, RunUntilTime(run_to), "");
 
   task_runner_->SetRunTaskLimit(100);
   RUN_AND_CHECK_RESULT(EXPECT_FALSE, RunUntilTime(run_to), "4(4ms) 5(5ms)");
   EXPECT_EQ(run_to, now_src_->NowTicks());
 }
 
 }  // namespace cc