1 files changed, 164 insertions, 0 deletions
diff --git a/browser/components/preferences/tests/browser_performance_e10srollout.js b/browser/components/preferences/tests/browser_performance_e10srollout.js
new file mode 100644
index 0000000000..1c2c57b6e7
--- /dev/null
+++ b/browser/components/preferences/tests/browser_performance_e10srollout.js
@@ -0,0 +1,164 @@
+const DEFAULT_HW_ACCEL_PREF = Services.prefs
+  .getDefaultBranch(null)
+  .getBoolPref("layers.acceleration.disabled");
+const DEFAULT_PROCESS_COUNT = Services.prefs
+  .getDefaultBranch(null)
+  .getIntPref("dom.ipc.processCount");
+
+add_task(async function () {
+  // We must temporarily disable `Once` StaticPrefs check for the duration of
+  // this test (see bug 1556131). We must do so in a separate operation as
+  // pushPrefEnv doesn't set the preferences in the order one could expect.
+  await SpecialPowers.pushPrefEnv({
+    set: [["preferences.force-disable.check.once.policy", true]],
+  });
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["layers.acceleration.disabled", DEFAULT_HW_ACCEL_PREF],
+      ["dom.ipc.processCount", DEFAULT_PROCESS_COUNT],
+      ["browser.preferences.defaultPerformanceSettings.enabled", true],
+    ],
+  });
+});
+
+add_task(async function testPrefsAreDefault() {
+  Services.prefs.setIntPref("dom.ipc.processCount", DEFAULT_PROCESS_COUNT);
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let useRecommendedPerformanceSettings = doc.querySelector(
+    "#useRecommendedPerformanceSettings"
+  );
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    true,
+    "pref value should be true before clicking on checkbox"
+  );
+  ok(
+    useRecommendedPerformanceSettings.checked,
+    "checkbox should be checked before clicking on checkbox"
+  );
+
+  useRecommendedPerformanceSettings.click();
+
+  let performanceSettings = doc.querySelector("#performanceSettings");
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section is shown"
+  );
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    false,
+    "pref value should be false after clicking on checkbox"
+  );
+  ok(
+    !useRecommendedPerformanceSettings.checked,
+    "checkbox should not be checked after clicking on checkbox"
+  );
+
+  let contentProcessCount = doc.querySelector("#contentProcessCount");
+  is(
+    contentProcessCount.disabled,
+    false,
+    "process count control should be enabled"
+  );
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    DEFAULT_PROCESS_COUNT,
+    "default pref should be default value"
+  );
+  is(
+    contentProcessCount.selectedItem.value,
+    "" + DEFAULT_PROCESS_COUNT,
+    "selected item should be the default one"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  Services.prefs.clearUserPref("dom.ipc.processCount");
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+});
+
+add_task(async function testPrefsSetByUser() {
+  const kNewCount = DEFAULT_PROCESS_COUNT - 2;
+
+  Services.prefs.setIntPref("dom.ipc.processCount", kNewCount);
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    false
+  );
+
+  let prefs = await openPreferencesViaOpenPreferencesAPI("paneGeneral", {
+    leaveOpen: true,
+  });
+  is(prefs.selectedPane, "paneGeneral", "General pane was selected");
+
+  let doc = gBrowser.contentDocument;
+  let performanceSettings = doc.querySelector("#performanceSettings");
+  is(
+    performanceSettings.hidden,
+    false,
+    "performance settings section is shown"
+  );
+
+  let contentProcessCount = doc.querySelector("#contentProcessCount");
+  is(
+    contentProcessCount.disabled,
+    false,
+    "process count control should be enabled"
+  );
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    kNewCount,
+    "process count should be the set value"
+  );
+  is(
+    contentProcessCount.selectedItem.value,
+    "" + kNewCount,
+    "selected item should be the set one"
+  );
+
+  let useRecommendedPerformanceSettings = doc.querySelector(
+    "#useRecommendedPerformanceSettings"
+  );
+  useRecommendedPerformanceSettings.click();
+
+  is(
+    Services.prefs.getBoolPref(
+      "browser.preferences.defaultPerformanceSettings.enabled"
+    ),
+    true,
+    "pref value should be true after clicking on checkbox"
+  );
+  is(
+    Services.prefs.getIntPref("dom.ipc.processCount"),
+    DEFAULT_PROCESS_COUNT,
+    "process count should be default value"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+
+  Services.prefs.clearUserPref("dom.ipc.processCount");
+  Services.prefs.setBoolPref(
+    "browser.preferences.defaultPerformanceSettings.enabled",
+    true
+  );
+});