Update SRTFetcher browser test to use ScopedMockTimeMessageLoopTaskRunner

chrome/browser/safe_browsing/srt_fetcher_browsertest_win.cc

Index: chrome/browser/safe_browsing/srt_fetcher_browsertest_win.cc
diff --git a/chrome/browser/safe_browsing/srt_fetcher_browsertest_win.cc b/chrome/browser/safe_browsing/srt_fetcher_browsertest_win.cc
index 01409845850f07e3bd50b70e25bc5b4ebfc72b31..e70536a273f69cc474c8e02f0aad07faa0564f59 100644
--- a/chrome/browser/safe_browsing/srt_fetcher_browsertest_win.cc
+++ b/chrome/browser/safe_browsing/srt_fetcher_browsertest_win.cc
@@ -10,12 +10,18 @@
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
+#include "base/callback.h"
 #include "base/files/file_path.h"
-#include "base/run_loop.h"
+#include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop.h"
 #include "base/test/scoped_feature_list.h"
-#include "base/test/test_simple_task_runner.h"
+#include "base/test/test_mock_time_task_runner.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
+#include "base/version.h"
 #include "chrome/browser/browser_process.h"
+#include "chrome/browser/lifetime/keep_alive_types.h"
+#include "chrome/browser/lifetime/scoped_keep_alive.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/safe_browsing/srt_client_info_win.h"
 #include "chrome/browser/ui/browser.h"
@@ -25,7 +31,6 @@
 #include "components/component_updater/pref_names.h"
 #include "components/prefs/pref_service.h"
 #include "components/safe_browsing_db/safe_browsing_prefs.h"
-#include "content/public/test/test_browser_thread_bundle.h"
 
 namespace safe_browsing {
 
@@ -39,21 +44,67 @@ class SRTFetcherTest : public InProcessBrowserTest,
                        public SwReporterTestingDelegate {
  public:
   void SetUpInProcessBrowserTestFixture() override {
-    task_runner_ = new base::TestSimpleTaskRunner;
-
     SetSwReporterTestingDelegate(this);
   }
 
   void SetUpOnMainThread() override {
+    // During the test, use a task runner with a mock clock.
+    saved_task_runner_ = base::ThreadTaskRunnerHandle::Get();
+    DCHECK(saved_task_runner_ != mock_time_task_runner_);
+    base::MessageLoop::current()->SetTaskRunner(mock_time_task_runner_);
+
     InProcessBrowserTest::SetUpOnMainThread();
+
+    // SetDateInLocalState calculates a time as Now() minus an offset. Move the
+    // simulated clock ahead far enough that this calculation won't underflow.
+    mock_time_task_runner_->FastForwardBy(
+        base::TimeDelta::FromDays(kDaysBetweenSuccessfulSwReporterRuns * 2));
+
     ClearLastTimeSentReport();
   }
 
+  void TearDownOnMainThread() override {
+    // Restore the standard task runner to perform browser cleanup, which will
+    // wait forever with the mock clock.
+    base::MessageLoop::current()->SetTaskRunner(saved_task_runner_);
+  }
+
   void TearDownInProcessBrowserTestFixture() override {
     SetSwReporterTestingDelegate(nullptr);
   }
 
-  void RunReporter(const base::FilePath& exe_path = base::FilePath()) {
+  // Records that the prompt was shown.
+  void TriggerPrompt(Browser* browser, const std::string& version) override {
+    prompt_trigger_called_ = true;
+  }
+
+  // Records that the reporter was launched with the parameters given in
+  // |invocation|.
+  int LaunchReporter(const SwReporterInvocation& invocation) override {
+    ++reporter_launch_count_;
+    reporter_launch_parameters_.push_back(invocation);
+    if (first_launch_callback_)
+      std::move(first_launch_callback_).Run();
+    return exit_code_to_report_;
+  }
+
+  // Returns the test's idea of the current time.
+  base::Time Now() const override { return mock_time_task_runner_->Now(); }
+
+  // Returns a task runner to use when launching the reporter (which is
+  // normally a blocking action).
+  base::TaskRunner* BlockingTaskRunner() const override {
+    // Use the test's main task runner so that we don't need to pump another
+    // message loop. Since the test calls LaunchReporter instead of actually
+    // doing a blocking reporter launch, it doesn't matter that the task runner
+    // doesn't have the MayBlock trait.
+    return mock_time_task_runner_.get();
+  }
+
+  // Schedules a single reporter to run.
+  void RunReporter(int exit_code_to_report,
+                   const base::FilePath& exe_path = base::FilePath()) {
+    exit_code_to_report_ = exit_code_to_report;
     auto invocation = SwReporterInvocation::FromFilePath(exe_path);
     invocation.supported_behaviours =
         SwReporterInvocation::BEHAVIOUR_LOG_TO_RAPPOR |
@@ -63,364 +114,257 @@ class SRTFetcherTest : public InProcessBrowserTest,
 
     SwReporterQueue invocations;
     invocations.push(invocation);
-    RunSwReporters(invocations, base::Version("1.2.3"), task_runner_,
-                   task_runner_);
+    RunSwReporters(invocations, base::Version("1.2.3"));
   }
 
-  void RunReporterQueue(const SwReporterQueue& invocations) {
-    RunSwReporters(invocations, base::Version("1.2.3"), task_runner_,
-                   task_runner_);
+  // Schedules a queue of reporters to run.
+  void RunReporterQueue(int exit_code_to_report,
+                        const SwReporterQueue& invocations) {
+    exit_code_to_report_ = exit_code_to_report;
+    RunSwReporters(invocations, base::Version("1.2.3"));
   }
 
-  void TriggerPrompt(Browser* browser, const std::string& version) override {
-    prompt_trigger_called_ = true;
-  }
-
-  int LaunchReporter(const SwReporterInvocation& invocation) override {
-    ++reporter_launch_count_;
-    reporter_launch_parameters_ = invocation;
-    return exit_code_to_report_;
-  }
-
-  void NotifyLaunchReady() override { launch_ready_notified_ = true; }
-
-  void NotifyReporterDone() override { reporter_done_notified_ = true; }
-
   // Sets |path| in the local state to a date corresponding to |days| days ago.
   void SetDateInLocalState(const std::string& path, int days) {
     PrefService* local_state = g_browser_process->local_state();
-    DCHECK_NE(local_state, nullptr);
-    local_state->SetInt64(path,
-                          (base::Time::Now() - base::TimeDelta::FromDays(days))
-                              .ToInternalValue());
+    local_state->SetInt64(
+        path, (Now() - base::TimeDelta::FromDays(days)).ToInternalValue());
   }
 
-  void SetDaysSinceLastReport(int days) {
+  // Sets local state for last time the software reporter ran to |days| days
+  // ago.
+  void SetDaysSinceLastTriggered(int days) {
     SetDateInLocalState(prefs::kSwReporterLastTimeTriggered, days);
   }
 
-  void ExpectToRunAgain(int days) {
-    ASSERT_TRUE(task_runner_->HasPendingTask());
-    EXPECT_LE(task_runner_->NextPendingTaskDelay(),
-              base::TimeDelta::FromDays(days));
-    EXPECT_GT(task_runner_->NextPendingTaskDelay(),
-              base::TimeDelta::FromDays(days) - base::TimeDelta::FromHours(1));
+  // Sets local state for last time the software reporter sent logs to |days|
+  // days ago.
+  void SetLastTimeSentReport(int days) {
+    SetDateInLocalState(prefs::kSwReporterLastTimeSentReport, days);
   }
 
-  // Clears local state for last time the software reporter sent logs to |days|
-  // days ago. This prevents potential false positives that could arise from
-  // state not properly cleaned between successive tests.
+  // Clears local state for last time the software reporter sent logs. This
+  // prevents potential false positives that could arise from state not
+  // properly cleaned between successive tests.
   void ClearLastTimeSentReport() {
-    DCHECK_NE(g_browser_process, nullptr);
     PrefService* local_state = g_browser_process->local_state();
-    DCHECK_NE(local_state, nullptr);
     local_state->ClearPref(prefs::kSwReporterLastTimeSentReport);
   }
 
-  // Sets local state for last time the software reporter sent logs to |days|
-  // days ago.
-  void SetLastTimeSentReport(int days) {
-    SetDateInLocalState(prefs::kSwReporterLastTimeSentReport, days);
-  }
-
+  // Retrieves the timestamp of the last time the software reporter sent logs.
   int64_t GetLastTimeSentReport() {
     const PrefService* local_state = g_browser_process->local_state();
-    DCHECK_NE(local_state, nullptr);
     DCHECK(local_state->HasPrefPath(prefs::kSwReporterLastTimeSentReport));
     return local_state->GetInt64(prefs::kSwReporterLastTimeSentReport);
   }
 
+  void EnableSBExtendedReporting() {
+    Browser* browser = chrome::FindLastActive();
+    DCHECK(browser);
+    Profile* profile = browser->profile();
+    SetExtendedReportingPref(profile->GetPrefs(), true);
+  }
+
+  // Expects that the reporter has been scheduled to launch again in |days|
+  // days.
+  void ExpectToRunAgain(int days) {
+    EXPECT_TRUE(mock_time_task_runner_->HasPendingTask());
+    EXPECT_LT(base::TimeDelta::FromDays(days) - base::TimeDelta::FromHours(1),
+              mock_time_task_runner_->NextPendingTaskDelay());
+    EXPECT_GE(base::TimeDelta::FromDays(days),
+              mock_time_task_runner_->NextPendingTaskDelay());
+  }
+
+  // Expects that after |days_until_launch| days, the reporter will be
+  // launched |expected_launch_count| times, and TriggerPrompt will be
+  // called if and only if |expect_prompt| is true.
+  void ExpectReporterLaunches(int days_until_launch,
+                              int expected_launch_count,
+                              bool expect_prompt) {
+    EXPECT_TRUE(mock_time_task_runner_->HasPendingTask());
+    reporter_launch_count_ = 0;
+    reporter_launch_parameters_.clear();
+    prompt_trigger_called_ = false;
+
+    mock_time_task_runner_->FastForwardBy(
+        base::TimeDelta::FromDays(days_until_launch));
+
+    EXPECT_EQ(expected_launch_count, reporter_launch_count_);
+    EXPECT_EQ(expect_prompt, prompt_trigger_called_);
+  }
+
+  // Expects that after |days_until_launched| days, the reporter will be
+  // launched once with each path in |expected_launch_paths|, and TriggerPrompt
+  // will be called if and only if |expect_prompt| is true.
+  void ExpectReporterLaunches(
+      int days_until_launch,
+      const std::vector<base::FilePath>& expected_launch_paths,
+      bool expect_prompt) {
+    ExpectReporterLaunches(days_until_launch, expected_launch_paths.size(),
+                           expect_prompt);
+    ASSERT_EQ(expected_launch_paths.size(), reporter_launch_parameters_.size());

[grt (UTC plus 2), 2017/02/23 13:13:26]

either change this to EXPECT_EQ or have all callers use ASSERT_NO_FATAL_FAILURE
as per discussion in other comment

[Joe Mason, 2017/02/23 15:49:29]

Done.

+    for (size_t i = 0; i < expected_launch_paths.size(); ++i) {
+      EXPECT_EQ(expected_launch_paths[i],
+                reporter_launch_parameters_[i].command_line.GetProgram());
+    }
+  }
+
   void ExpectLastTimeSentReportNotSet() {
     PrefService* local_state = g_browser_process->local_state();
-    DCHECK_NE(local_state, nullptr);
     EXPECT_FALSE(
         local_state->HasPrefPath(prefs::kSwReporterLastTimeSentReport));
   }
 
   void ExpectLastReportSentInTheLastHour() {
     const PrefService* local_state = g_browser_process->local_state();
-    DCHECK_NE(local_state, nullptr);
-    const base::Time now = base::Time::Now();
+    const base::Time now = Now();
     const base::Time last_time_sent_logs = base::Time::FromInternalValue(
         local_state->GetInt64(prefs::kSwReporterLastTimeSentReport));
 
     // Checks if the last time sent logs is set as no more than one hour ago,
     // which should be enough time if the execution does not fail.
     EXPECT_LT(now - base::TimeDelta::FromHours(1), last_time_sent_logs);
-    EXPECT_LT(last_time_sent_logs, now);
-  }
-
-  // Run through the steps needed to launch the reporter, as many times as
-  // needed to launch all the reporters given in |expected_launch_paths|. Test
-  // that each of those launches succeeded. But do not test that ONLY those
-  // launches succeeded.
-  //
-  // After this, if more launches are expected you can call
-  // |TestPartialLaunchCycle| again with another list of paths, to test that
-  // the launch cycle will continue with those paths.
-  //
-  // To test that a list of paths are launched AND NO OTHERS, use
-  // |TestReporterLaunchCycle|.
-  void TestPartialLaunchCycle(
-      const std::vector<base::FilePath>& expected_launch_paths) {
-    // This test has an unfortunate amount of knowledge of the internals of
-    // ReporterRunner, because it needs to pump the right message loops at the
-    // right time so that all its internal messages are delivered. This
-    // function might need to be updated if the internals change.
-    //
-    // The basic sequence is:
-    //
-    // 1. TryToRun kicks the whole thing off. If the reporter should not be
-    // launched now (eg. DaysSinceLastReport is too low) it posts a call to
-    // itself again. (In a regular task runner this will be scheduled with a
-    // delay, but the test task runner ignores delays so TryToRun will be
-    // called again on the next call to RunPendingTasks.)
-    //
-    // 2. When it is time to run a reporter, TryToRun calls NotifyLaunchReady
-    // and then posts a call to LaunchAndWait.
-    //
-    // 3. When the reporter returns, a call to ReporterDone is posted on the UI
-    // thread.
-    //
-    // 4. ReporterDone calls NotifyReporterDone and then posts another call to
-    // TryToRun, which starts the whole process over for the next run.
-    //
-    // Each call to RunPendingTasks only handles messages already on the queue.
-    // It doesn't handle messages posted by those messages. So, we need to call
-    // it in a loop to make sure we're past all pending TryToRun calls before
-    // LaunchAndWaitForExit will be called.
-    //
-    // Once a call to LaunchAndWaitForExit has been posted, TryToRun won't be
-    // called again until we pump the UI message loop in order to run
-    // ReporterDone.
-
-    ASSERT_TRUE(task_runner_->HasPendingTask());
-    ASSERT_FALSE(reporter_done_notified_);
-
-    reporter_launch_count_ = 0;
-    reporter_launch_parameters_ = SwReporterInvocation();
-
-    int current_launch_count = reporter_launch_count_;
-    for (const auto& expected_launch_path : expected_launch_paths) {
-      // If RunReporter was called with no pending messages, and it was already
-      // time to launch the reporter, then |launch_ready_notified_| will
-      // already be true. Otherwise there will be a TryToRun message pending,
-      // which must be processed first.
-      if (!launch_ready_notified_) {
-        task_runner_->RunPendingTasks();
-        // Since we're expecting a launch here, we expect it to schedule
-        // LaunchAndWaitForExit. So NOW |launch_ready_notified_| should be
-        // true.
-        ASSERT_TRUE(task_runner_->HasPendingTask());
-      }
-      ASSERT_TRUE(launch_ready_notified_);
-      ASSERT_EQ(current_launch_count, reporter_launch_count_);
-
-      // Reset |launch_ready_notified_| so that we can tell if TryToRun gets
-      // called again unexpectedly.
-      launch_ready_notified_ = false;
-
-      // Call the pending LaunchAndWaitForExit.
-      task_runner_->RunPendingTasks();
-      ASSERT_FALSE(launch_ready_notified_);
-      ASSERT_FALSE(reporter_done_notified_);
-
-      // At this point LaunchAndWaitForExit has definitely been called if
-      // it's going to be called at all. (If not, TryToRun will have been
-      // scheduled again.)
-      EXPECT_EQ(current_launch_count + 1, reporter_launch_count_);
-      EXPECT_EQ(expected_launch_path,
-                reporter_launch_parameters_.command_line.GetProgram());
-
-      // Pump the UI message loop to process the ReporterDone call (which
-      // will schedule the next TryToRun.) If LaunchAndWaitForExit wasn't
-      // called, this does nothing.
-      base::RunLoop().RunUntilIdle();
-
-      // At this point there are three things that could have happened:
-      //
-      // 1. LaunchAndWaitForExit was not called. There should be a TryToRun
-      // scheduled.
-      //
-      // 2. ReporterDone was called and there was nothing left in the queue
-      // of SwReporterInvocation's. There should be a TryToRun scheduled.
-      //
-      // 3. ReporterDone was called and there were more
-      // SwReporterInvocation's in the queue to run immediately. There should
-      // be a LaunchAndWaitForExit scheduled.
-      //
-      // So in all cases there should be a pending task, and if we are expecting
-      // more launches in this loop, |launch_ready_notified_| will already be
-      // true.
-      ASSERT_TRUE(task_runner_->HasPendingTask());
-
-      // The test task runner does not actually advance the clock. Pretend that
-      // one day has passed. (Otherwise, when we launch the last
-      // SwReporterInvocation in the queue, the next call to TryToRun will
-      // start a whole new launch cycle.)
-      SetDaysSinceLastReport(1);
-
-      reporter_done_notified_ = false;
-      current_launch_count = reporter_launch_count_;
-    }
+    EXPECT_GE(now, last_time_sent_logs);
   }
 
-  // Run through the steps needed to launch the reporter, as many times as
-  // needed to launch all the reporters given in |expected_launch_paths|. Test
-  // that each of those launches succeeded. Then, run through the steps needed
-  // to launch the reporter again, to test that the launch cycle is complete
-  // (no more reporters will be launched).
-  void TestReporterLaunchCycle(
-      const std::vector<base::FilePath>& expected_launch_paths) {
-    TestPartialLaunchCycle(expected_launch_paths);
-
-    // Now that all expected launches have been tested, run the cycle once more
-    // to make sure no more launches happen.
-    ASSERT_TRUE(task_runner_->HasPendingTask());
-    ASSERT_FALSE(reporter_done_notified_);
-    ASSERT_FALSE(launch_ready_notified_);
-
-    int current_launch_count = reporter_launch_count_;
-
-    // Call the pending TryToRun.
-    task_runner_->RunPendingTasks();
-
-    // We expect that this scheduled another TryToRun. If it scheduled
-    // LaunchAndWaitForExit an unexpected launch is about to happen.
-    ASSERT_TRUE(task_runner_->HasPendingTask());
-    ASSERT_FALSE(launch_ready_notified_);
-    ASSERT_FALSE(reporter_done_notified_);
-    ASSERT_EQ(current_launch_count, reporter_launch_count_);
-  }
-
-  // Expects |reporter_launch_parameters_| to contain exactly the command line
-  // switches specified in |expected_switches|.
-  void ExpectLoggingSwitches(const std::set<std::string>& expected_switches) {
+  // Expects |invocation|'s command line to contain all the switches required
+  // for reporter logging.
+  void ExpectLoggingSwitches(const SwReporterInvocation& invocation,
+                             bool expect_switches) {
     const base::CommandLine::SwitchMap& invocation_switches =
-        reporter_launch_parameters_.command_line.GetSwitches();
+        invocation.command_line.GetSwitches();
+    std::set<std::string> expected_switches;
+    if (expect_switches)
+      expected_switches = {std::begin(kExpectedSwitches),
+                           std::end(kExpectedSwitches)};
     EXPECT_EQ(expected_switches.size(), invocation_switches.size());
     // Checks if all expected switches are in the invocation switches. It's not
     // necessary to check if all invocation switches are expected, since we
     // checked if both sets should have the same size.
     for (const std::string& expected_switch : expected_switches) {
-      EXPECT_NE(invocation_switches.find(expected_switch),
-                invocation_switches.end());
+      EXPECT_NE(invocation_switches.end(),
+                invocation_switches.find(expected_switch));
     }
   }
 
-  void EnableSBExtendedReporting() {
-    Browser* browser = chrome::FindLastActive();
-    ASSERT_NE(browser, nullptr);
-    Profile* profile = browser->profile();
-    ASSERT_NE(profile, nullptr);
-    SetExtendedReportingPref(profile->GetPrefs(), true);
-  }
+  // A task runner with a mock clock.
+  scoped_refptr<base::TestMockTimeTaskRunner> mock_time_task_runner_ =
+      new base::TestMockTimeTaskRunner();
+
+  // The task runner that was in use before installing |mock_time_task_runner_|.
+  scoped_refptr<base::SingleThreadTaskRunner> saved_task_runner_;
 
-  scoped_refptr<base::TestSimpleTaskRunner> task_runner_;
   bool prompt_trigger_called_ = false;
   int reporter_launch_count_ = 0;
-  SwReporterInvocation reporter_launch_parameters_;
+  std::vector<SwReporterInvocation> reporter_launch_parameters_;
   int exit_code_to_report_ = kReporterFailureExitCode;
 
-  // This will be set to true when a call to |LaunchAndWaitForExit| is next in
-  // the task queue.
-  bool launch_ready_notified_ = false;
-
-  bool reporter_done_notified_ = false;
+  // A callback to invoke when the first reporter of a queue is launched. This
+  // can be used to perform actions in the middle of a queue of reporters which
+  // all launch on the same mock clock tick.
+  base::OnceClosure first_launch_callback_;
 };
 
 }  // namespace
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, NothingFound) {
-  exit_code_to_report_ = kSwReporterNothingFound;
-  RunReporter();
-  task_runner_->RunPendingTasks();
-  EXPECT_EQ(1, reporter_launch_count_);
-  base::RunLoop().RunUntilIdle();
-  EXPECT_FALSE(prompt_trigger_called_);
+  RunReporter(kSwReporterNothingFound);
+  ExpectReporterLaunches(0, 1, false);
   ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, CleanupNeeded) {
-  exit_code_to_report_ = kSwReporterCleanupNeeded;
-  RunReporter();
-
-  task_runner_->RunPendingTasks();
-  EXPECT_EQ(1, reporter_launch_count_);
-  // The reply task from the task posted to run the reporter is run on a
-  // specific thread, as opposed to a specific task runner, and that thread is
-  // the current message loop's thread.
-  base::RunLoop().RunUntilIdle();
-  EXPECT_TRUE(prompt_trigger_called_);
+  RunReporter(kSwReporterCleanupNeeded);
+  ExpectReporterLaunches(0, 1, true);
   ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, RanRecently) {
   constexpr int kDaysLeft = 1;
-  SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns - kDaysLeft);
-  RunReporter();
-
-  // Here we can't run until idle since the ReporterRunner will re-post
-  // infinitely.
-  task_runner_->RunPendingTasks();
-  EXPECT_EQ(0, reporter_launch_count_);
-
+  SetDaysSinceLastTriggered(kDaysBetweenSuccessfulSwReporterRuns - kDaysLeft);
+  RunReporter(kSwReporterNothingFound);
+  ExpectReporterLaunches(0, 0, false);
   ExpectToRunAgain(kDaysLeft);
-  task_runner_->ClearPendingTasks();
+  ExpectReporterLaunches(kDaysLeft, 1, false);
+  ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, WaitForBrowser) {
   Profile* profile = browser()->profile();
-  CloseAllBrowsers();
 
-  exit_code_to_report_ = kSwReporterCleanupNeeded;
-  RunReporter();
-
-  task_runner_->RunPendingTasks();
+  // Ensure that even though we're closing the last browser, we don't enter the
+  // "shutting down" state, which will prevent the test from starting another
+  // browser.
+  ScopedKeepAlive test_keep_alive(KeepAliveOrigin::SESSION_RESTORE,
+                                  KeepAliveRestartOption::ENABLED);
+
+  // Use the standard task runner for browser cleanup, which will wait forever
+  // with the mock clock.
+  base::MessageLoop::current()->SetTaskRunner(saved_task_runner_);
+  CloseBrowserSynchronously(browser());
+  base::MessageLoop::current()->SetTaskRunner(mock_time_task_runner_);
+  ASSERT_EQ(0u, chrome::GetTotalBrowserCount());
+  ASSERT_FALSE(chrome::FindLastActive());
+
+  // Start the reporter while the browser is closed. The prompt should not open.
+  RunReporter(kSwReporterCleanupNeeded);
+  ExpectReporterLaunches(0, 1, false);
+
+  // Create a Browser object directly instead of using helper functions like
+  // CreateBrowser, because they all wait on timed events but do not advance the
+  // mock timer. The Browser constructor registers itself with the global
+  // BrowserList, which is cleaned up when InProcessBrowserTest exits.
+  new Browser(Browser::CreateParams(profile));
+  ASSERT_EQ(1u, chrome::GetTotalBrowserCount());
+
+  // Some browser startup tasks are scheduled to run in the first few minutes
+  // after creation. Make sure they've all been processed so that the only
+  // pending task in the queue is the next reporter check.
+  mock_time_task_runner_->FastForwardBy(base::TimeDelta::FromMinutes(10));
+
+  // On opening the new browser, the prompt should be shown and the reporter
+  // should be scheduled to run later.
   EXPECT_EQ(1, reporter_launch_count_);
-
-  CreateBrowser(profile);
   EXPECT_TRUE(prompt_trigger_called_);
   ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, Failure) {
-  exit_code_to_report_ = kReporterFailureExitCode;
-  RunReporter();
-
-  task_runner_->RunPendingTasks();
-  EXPECT_EQ(1, reporter_launch_count_);
-
-  base::RunLoop().RunUntilIdle();
-  EXPECT_FALSE(prompt_trigger_called_);
+  RunReporter(kReporterFailureExitCode);
+  ExpectReporterLaunches(0, 1, false);
   ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, RunDaily) {
-  exit_code_to_report_ = kSwReporterNothingFound;
   PrefService* local_state = g_browser_process->local_state();
   local_state->SetBoolean(prefs::kSwReporterPendingPrompt, true);
-  SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns - 1);
+  SetDaysSinceLastTriggered(kDaysBetweenSuccessfulSwReporterRuns - 1);
   DCHECK_GT(kDaysBetweenSuccessfulSwReporterRuns - 1,
             kDaysBetweenSwReporterRunsForPendingPrompt);
-  RunReporter();
+  RunReporter(kSwReporterNothingFound);
 
-  task_runner_->RunPendingTasks();
-  EXPECT_EQ(1, reporter_launch_count_);
-  reporter_launch_count_ = 0;
-  base::RunLoop().RunUntilIdle();
+  // Expect the reporter to run immediately, since a prompt is pending and it
+  // has been more than kDaysBetweenSwReporterRunsForPendingPrompt days.
+  ExpectReporterLaunches(0, 1, false);
   ExpectToRunAgain(kDaysBetweenSwReporterRunsForPendingPrompt);
 
+  // Move the clock ahead kDaysBetweenSwReporterRunsForPendingPrompt days. The
+  // expected run should trigger, but not cause the reporter to launch because
+  // a prompt is no longer pending.
   local_state->SetBoolean(prefs::kSwReporterPendingPrompt, false);
-  task_runner_->RunPendingTasks();
-  EXPECT_EQ(0, reporter_launch_count_);
-  base::RunLoop().RunUntilIdle();
+  ExpectReporterLaunches(kDaysBetweenSwReporterRunsForPendingPrompt, 0, false);
+
+  // Instead it should now run kDaysBetweenSuccessfulSwReporterRuns after the
+  // first prompt (of which kDaysBetweenSwReporterRunsForPendingPrompt has
+  // already passed.)
+  int days_left = kDaysBetweenSuccessfulSwReporterRuns -
+                  kDaysBetweenSwReporterRunsForPendingPrompt;
+  ExpectToRunAgain(days_left);
+  ExpectReporterLaunches(days_left, 1, false);
   ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ParameterChange) {
-  exit_code_to_report_ = kSwReporterNothingFound;
-
   // If the reporter is run several times with different parameters, it should
   // only be launched once, with the last parameter set.
   const base::FilePath path1(L"path1");
@@ -432,29 +376,27 @@ IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ParameterChange) {
   constexpr int kDaysLeft = 1;
   {
     SCOPED_TRACE("N days left until next reporter run");
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns - kDaysLeft);
-    RunReporter(path1);
-    TestReporterLaunchCycle({});
+    SetDaysSinceLastTriggered(kDaysBetweenSuccessfulSwReporterRuns - kDaysLeft);
+    RunReporter(kSwReporterNothingFound, path1);
+    ExpectReporterLaunches(0, {}, false);
   }
 
   // Schedule path2 just as we enter the next reporting period.
   // Now the reporter should launch, just once, using path2.
   {
     SCOPED_TRACE("Reporter runs now");
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns);
-    RunReporter(path2);
+    RunReporter(kSwReporterNothingFound, path2);
     // Schedule it twice; it should only actually run once.
-    RunReporter(path2);
-    TestReporterLaunchCycle({path2});
+    RunReporter(kSwReporterNothingFound, path2);
+    ExpectReporterLaunches(kDaysLeft, {path2}, false);
   }
 
   // Schedule path3 before any more time has passed.
   // The reporter should not launch.
   {
     SCOPED_TRACE("No more time passed");
-    SetDaysSinceLastReport(0);
-    RunReporter(path3);
-    TestReporterLaunchCycle({});
+    RunReporter(kSwReporterNothingFound, path3);
+    ExpectReporterLaunches(0, {}, false);
   }
 
   // Enter the next reporting period as path3 is still scheduled.
@@ -462,8 +404,8 @@ IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ParameterChange) {
   // parameters from the first launch aren't reused.)
   {
     SCOPED_TRACE("Previous run still scheduled");
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns);
-    TestReporterLaunchCycle({path3});
+    ExpectReporterLaunches(kDaysBetweenSuccessfulSwReporterRuns, {path3},
+                           false);
   }
 
   // Schedule path3 again in the next reporting period.
@@ -471,15 +413,13 @@ IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ParameterChange) {
   // passed, even though the parameters haven't changed.
   {
     SCOPED_TRACE("Run with same parameters");
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns);
-    RunReporter(path3);
-    TestReporterLaunchCycle({path3});
+    RunReporter(kSwReporterNothingFound, path3);
+    ExpectReporterLaunches(kDaysBetweenSuccessfulSwReporterRuns, {path3},
+                           false);
   }
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, MultipleLaunches) {
-  exit_code_to_report_ = kSwReporterNothingFound;
-
   const base::FilePath path1(L"path1");
   const base::FilePath path2(L"path2");
   const base::FilePath path3(L"path3");
@@ -490,100 +430,96 @@ IN_PROC_BROWSER_TEST_F(SRTFetcherTest, MultipleLaunches) {
 
   {
     SCOPED_TRACE("Launch 2 times");
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns);
-    RunReporterQueue(invocations);
-    TestReporterLaunchCycle({path1, path2});
+    SetDaysSinceLastTriggered(kDaysBetweenSuccessfulSwReporterRuns);
+    RunReporterQueue(kSwReporterNothingFound, invocations);
+    ExpectReporterLaunches(0, {path1, path2}, false);
+    ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
   }
 
   // Schedule a launch with 2 elements, then another with the same 2. It should
   // just run 2 times, not 4.
   {
     SCOPED_TRACE("Launch 2 times with retry");
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns);
-    RunReporterQueue(invocations);
-    RunReporterQueue(invocations);
-    TestReporterLaunchCycle({path1, path2});
+    RunReporterQueue(kSwReporterNothingFound, invocations);
+    RunReporterQueue(kSwReporterNothingFound, invocations);
+    ExpectReporterLaunches(kDaysBetweenSuccessfulSwReporterRuns, {path1, path2},
+                           false);
+    ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
   }
 
-  // Schedule a launch with 2 elements, then add a third while the queue is
-  // running.
+  // Another launch with 2 elements is already scheduled. Add a third while the
+  // queue is running.
   {
     SCOPED_TRACE("Add third launch while running");
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns);
-    RunReporterQueue(invocations);
-
-    // Only test the cycle once, to process the first element in queue.
-    TestPartialLaunchCycle({path1});
-
     invocations.push(SwReporterInvocation::FromFilePath(path3));
-    RunReporterQueue(invocations);
+    first_launch_callback_ = base::BindOnce(
+        &SRTFetcherTest::RunReporterQueue, base::Unretained(this),
+        kSwReporterNothingFound, invocations);
 
-    // There is still a 2nd element on the queue - that should execute, and
-    // nothing more.
-    TestReporterLaunchCycle({path2});
+    // Only the first two elements should execute since the third was added
+    // during the cycle.
+    ExpectReporterLaunches(kDaysBetweenSuccessfulSwReporterRuns, {path1, path2},
+                           false);
+    ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
 
     // Time passes... Now the 3-element queue should run.
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns);
-    TestReporterLaunchCycle({path1, path2, path3});
+    ExpectReporterLaunches(kDaysBetweenSuccessfulSwReporterRuns,
+                           {path1, path2, path3}, false);
+    ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
   }
 
   // Second launch should not occur after a failure.
   {
     SCOPED_TRACE("Launch multiple times with failure");
-    exit_code_to_report_ = kReporterFailureExitCode;
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns);
-    RunReporterQueue(invocations);
-    TestReporterLaunchCycle({path1});
+    RunReporterQueue(kReporterFailureExitCode, invocations);
+    ExpectReporterLaunches(kDaysBetweenSuccessfulSwReporterRuns, {path1},
+                           false);
+    ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
 
     // If we try again before the reporting period is up, it should not do
     // anything.
-    TestReporterLaunchCycle({});
+    ExpectReporterLaunches(0, {}, false);
 
     // After enough time has passed, should try the queue again.
-    SetDaysSinceLastReport(kDaysBetweenSuccessfulSwReporterRuns);
-    TestReporterLaunchCycle({path1});
+    ExpectReporterLaunches(kDaysBetweenSuccessfulSwReporterRuns, {path1},
+                           false);
+    ExpectToRunAgain(kDaysBetweenSuccessfulSwReporterRuns);
   }
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ReporterLogging_NoSBExtendedReporting) {
-  exit_code_to_report_ = kSwReporterNothingFound;
   base::test::ScopedFeatureList scoped_feature_list;
-  RunReporter();
-  TestReporterLaunchCycle({base::FilePath()});
-  ExpectLoggingSwitches({/*expect no switches*/});
+  RunReporter(kSwReporterNothingFound);
+  ExpectReporterLaunches(0, 1, false);
+  ExpectLoggingSwitches(reporter_launch_parameters_.front(), false);
   ExpectLastTimeSentReportNotSet();
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ReporterLogging_EnabledFirstRun) {
-  exit_code_to_report_ = kSwReporterNothingFound;
   base::test::ScopedFeatureList scoped_feature_list;
   EnableSBExtendedReporting();
   // Note: don't set last time sent logs in the local state.
   // SBER is enabled and there is no record in the local state of the last time
   // logs have been sent, so we should send logs in this run.
-  RunReporter();
-  TestReporterLaunchCycle({base::FilePath()});
-  ExpectLoggingSwitches(std::set<std::string>(std::begin(kExpectedSwitches),
-                                              std::end(kExpectedSwitches)));
+  RunReporter(kSwReporterNothingFound);
+  ExpectReporterLaunches(0, 1, false);
+  ExpectLoggingSwitches(reporter_launch_parameters_.front(), true);
   ExpectLastReportSentInTheLastHour();
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ReporterLogging_EnabledNoRecentLogging) {
-  exit_code_to_report_ = kSwReporterNothingFound;
   base::test::ScopedFeatureList scoped_feature_list;
   // SBER is enabled and last time logs were sent was more than
   // |kDaysBetweenReporterLogsSent| day ago, so we should send logs in this run.
   EnableSBExtendedReporting();
   SetLastTimeSentReport(kDaysBetweenReporterLogsSent + 3);
-  RunReporter();
-  TestReporterLaunchCycle({base::FilePath()});
-  ExpectLoggingSwitches(std::set<std::string>(std::begin(kExpectedSwitches),
-                                              std::end(kExpectedSwitches)));
+  RunReporter(kSwReporterNothingFound);
+  ExpectReporterLaunches(0, 1, false);
+  ExpectLoggingSwitches(reporter_launch_parameters_.front(), true);
   ExpectLastReportSentInTheLastHour();
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ReporterLogging_EnabledRecentlyLogged) {
-  exit_code_to_report_ = kSwReporterNothingFound;
   base::test::ScopedFeatureList scoped_feature_list;
   // SBER is enabled, but logs have been sent less than
   // |kDaysBetweenReporterLogsSent| day ago, so we shouldn't send any logs in
@@ -591,14 +527,13 @@ IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ReporterLogging_EnabledRecentlyLogged) {
   EnableSBExtendedReporting();
   SetLastTimeSentReport(kDaysBetweenReporterLogsSent - 1);
   int64_t last_time_sent_logs = GetLastTimeSentReport();
-  RunReporter();
-  TestReporterLaunchCycle({base::FilePath()});
-  ExpectLoggingSwitches(std::set<std::string>{/*expect no switches*/});
+  RunReporter(kSwReporterNothingFound);
+  ExpectReporterLaunches(0, 1, false);
+  ExpectLoggingSwitches(reporter_launch_parameters_.front(), false);
   EXPECT_EQ(last_time_sent_logs, GetLastTimeSentReport());
 }
 
 IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ReporterLogging_MultipleLaunches) {
-  exit_code_to_report_ = kSwReporterNothingFound;
   base::test::ScopedFeatureList scoped_feature_list;
   EnableSBExtendedReporting();
   SetLastTimeSentReport(kDaysBetweenReporterLogsSent + 3);
@@ -612,25 +547,24 @@ IN_PROC_BROWSER_TEST_F(SRTFetcherTest, ReporterLogging_MultipleLaunches) {
         SwReporterInvocation::BEHAVIOUR_ALLOW_SEND_REPORTER_LOGS;
     invocations.push(invocation);
   }
-  RunReporterQueue(invocations);
+  RunReporterQueue(kSwReporterNothingFound, invocations);
 
   // SBER is enabled and last time logs were sent was more than
   // |kDaysBetweenReporterLogsSent| day ago, so we should send logs in this run.
   {
     SCOPED_TRACE("first launch");
-    TestPartialLaunchCycle({path1});
-    ExpectLoggingSwitches(std::set<std::string>(std::begin(kExpectedSwitches),
-                                                std::end(kExpectedSwitches)));
-    ExpectLastReportSentInTheLastHour();
+    first_launch_callback_ =
+        base::BindOnce(&SRTFetcherTest::ExpectLastReportSentInTheLastHour,
+                       base::Unretained(this));
+    ExpectReporterLaunches(0, {path1, path2}, false);
+    ExpectLoggingSwitches(reporter_launch_parameters_[0], true);
   }
 
   // Logs should also be sent for the next run, even though LastTimeSentReport
   // is now recent, because the run is part of the same set of invocations.
   {
     SCOPED_TRACE("second launch");
-    TestReporterLaunchCycle({path2});
-    ExpectLoggingSwitches(std::set<std::string>(std::begin(kExpectedSwitches),
-                                                std::end(kExpectedSwitches)));
+    ExpectLoggingSwitches(reporter_launch_parameters_[1], true);
     ExpectLastReportSentInTheLastHour();
   }
 }