Diagnostics: Register individual MANUAL_ tests for debugging.

`browser_tests --gtest_filter=DiagnosticsApp*` to run in a single instance.
`browser_tests --run-manual --gtest_filter=DiagnosticsApp.MANUAL_*`
to run each test on a new instance.

Bug: 1125150
Test: Described above.
Change-Id: Iebef0469550523c2ef588e6ff6816ee2cc54683e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508792
Commit-Queue: Joon Ahn <joonbug@chromium.org>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822919}

chrome/test/data/webui/chromeos/diagnostics/diagnostics_app_unified_test.js

@@ -23,20 +23,27 @@ import {routineResultEntryTestSuite} from './routine_result_entry_test.js';
 import {routineResultListTestSuite} from './routine_result_list_test.js';
 import {routineSectionTestSuite} from './routine_section_test.js';
 
-suite('App', appTestSuite);
-suite('BatteryStatusCard', batteryStatusCardTestSuite);
-suite('CpuCard', cpuCardTestSuite);
-suite('DataPoint', dataPointTestSuite);
-suite('FakeMethodProvider', fakeMethodResolverTestSuite);
-suite('FakeMojoInterface', fakeMojoProviderTestSuite);
-suite('FakeObservables', fakeObservablesTestSuite);
-suite('FakeSystemDataProvider', fakeSystemDataProviderTestSuite);
-suite('FakeSystemRoutineContoller', fakeSystemRoutineContollerTestSuite);
-suite('MemoryCard', memoryCardTestSuite);
-suite('OverviewCard', overviewCardTestSuite);
-suite('PercentBarChart', percentBarChartTestSuite);
-suite('RealtimeCpuChart', realtimeCpuChartTestSuite);
-suite('RoutineListExecutor', fakeRoutineListExecutorTestSuite);
-suite('RoutineResultEntry', routineResultEntryTestSuite);
-suite('RoutineResultList', routineResultListTestSuite);
-suite('RoutineSection', routineSectionTestSuite);
+window.test_suites_list = [];
+
+function runSuite(suiteName, testFn) {
+  test_suites_list.push(suiteName);
+  suite(suiteName, testFn);
+}
+
+runSuite('App', appTestSuite);
+runSuite('BatteryStatusCard', batteryStatusCardTestSuite);
+runSuite('CpuCard', cpuCardTestSuite);
+runSuite('DataPoint', dataPointTestSuite);
+runSuite('FakeMethodProvider', fakeMethodResolverTestSuite);
+runSuite('FakeMojoInterface', fakeMojoProviderTestSuite);
+runSuite('FakeObservables', fakeObservablesTestSuite);
+runSuite('FakeSystemDataProvider', fakeSystemDataProviderTestSuite);
+runSuite('FakeSystemRoutineContoller', fakeSystemRoutineContollerTestSuite);
+runSuite('MemoryCard', memoryCardTestSuite);
+runSuite('OverviewCard', overviewCardTestSuite);
+runSuite('PercentBarChart', percentBarChartTestSuite);
+runSuite('RealtimeCpuChart', realtimeCpuChartTestSuite);
+runSuite('RoutineListExecutor', fakeRoutineListExecutorTestSuite);
+runSuite('RoutineResultEntry', routineResultEntryTestSuite);
+runSuite('RoutineResultList', routineResultListTestSuite);
+runSuite('RoutineSection', routineSectionTestSuite);

chrome/test/data/webui/chromeos/diagnostics/diagnostics_browsertest.js

@@ -4,6 +4,17 @@
 
 /**
  * @fileoverview Test fixture for chrome://diagnostics.
+ * Unifieid polymer testing suite for diagnostics app.
+ *
+ * To run all tests in a single instance (default, faster):
+ * `browser_tests --gtest_filter=DiagnosticsApp*``
+ *
+ * To run each test in a new instance:
+ * `browser_tests --run-manual --gtest_filter=DiagnosticsApp.MANUAL_*``
+ *
+ * To run a single test suite, such as 'CpuCard':
+ * `browser_tests --run-manual --gtest_filter=DiagnosticsApp.MANUAL_CpuCard`
+ *
  */
 
 GEN_INCLUDE(['//chrome/test/data/webui/polymer_browser_test_base.js']);
@@ -13,7 +24,7 @@ GEN('#include "content/public/test/browser_test.h"');
 
 const dxTestSuites = 'chromeos/diagnostics/diagnostics_app_unified_test.js';
 
-this['DiagnosticsAppTest'] = class extends PolymerTest {
+this['DiagnosticsApp'] = class extends PolymerTest {
   /** @override */
   get browsePreload() {
     return `chrome://diagnostics/test_loader.html?module=${dxTestSuites}`;
@@ -37,6 +48,28 @@ this['DiagnosticsAppTest'] = class extends PolymerTest {
   }
 };
 
-TEST_F('DiagnosticsAppTest', 'All', function() {
+// List of names of suites in unified test to register for individual debugging.
+// You must register all suites in unified test here as well for consistency,
+// although technically is not necessary.
+const debug_suites_list = [
+  'App', 'BatteryStatusCard', 'CpuCard', 'DataPoint', 'FakeMethodProvider',
+  'FakeMojoInterface', 'FakeObservables', 'FakeSystemDataProvider',
+  'FakeSystemRoutineContoller', 'MemoryCard', 'OverviewCard', 'PercentBarChart',
+  'RealtimeCpuChart', 'RoutineListExecutor', 'RoutineResultEntry',
+  'RoutineResultList', 'RoutineSection'
+];
+
+TEST_F('DiagnosticsApp', 'BrowserTest', function() {
+  assertDeepEquals(
+      debug_suites_list, test_suites_list,
+      'List of registered tests suites and debug suites do not match.\n' +
+          'Did you forget to add your test in debug_suites_list?');
   mocha.run();
-});
+});
\ No newline at end of file
+
+// Register each suite listed as individual tests for debugging purposes.
+for (const suiteName of debug_suites_list) {
+  TEST_F('DiagnosticsApp', `MANUAL_${suiteName}`, function() {
+    runMochaSuite(suiteName);
+  });
+}