1 files changed, 112 insertions, 0 deletions
diff --git a/browser/components/preferences/tests/browser_experimental_features_resetall.js b/browser/components/preferences/tests/browser_experimental_features_resetall.js
new file mode 100644
index 0000000000..636374c057
--- /dev/null
+++ b/browser/components/preferences/tests/browser_experimental_features_resetall.js
@@ -0,0 +1,112 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// It doesn't matter what two preferences are used here, as long as the first is a built-in
+// one that defaults to false and the second defaults to true.
+const KNOWN_PREF_1 = "browser.display.use_system_colors";
+const KNOWN_PREF_2 = "browser.underline_anchors";
+
+// This test verifies that pressing the reset all button for experimental features
+// resets all of the checkboxes to their default state.
+add_task(async function testResetAll() {
+  await SpecialPowers.pushPrefEnv({
+    set: [
+      ["browser.preferences.experimental", true],
+      ["test.featureA", false],
+      ["test.featureB", true],
+      [KNOWN_PREF_1, false],
+      [KNOWN_PREF_2, true],
+    ],
+  });
+
+  // Add a number of test features.
+  const server = new DefinitionServer();
+  let definitions = [
+    {
+      id: "test-featureA",
+      preference: "test.featureA",
+      defaultValue: false,
+    },
+    {
+      id: "test-featureB",
+      preference: "test.featureB",
+      defaultValue: true,
+    },
+    {
+      id: "test-featureC",
+      preference: KNOWN_PREF_1,
+      defaultValue: false,
+    },
+    {
+      id: "test-featureD",
+      preference: KNOWN_PREF_2,
+      defaultValue: true,
+    },
+  ];
+  for (let { id, preference, defaultValue } of definitions) {
+    server.addDefinition({ id, preference, defaultValue, isPublic: true });
+  }
+
+  await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    `about:preferences?definitionsUrl=${encodeURIComponent(
+      server.definitionsUrl
+    )}#paneExperimental`
+  );
+  let doc = gBrowser.contentDocument;
+
+  await TestUtils.waitForCondition(
+    () => doc.getElementById(definitions[definitions.length - 1].id),
+    "wait for the first public feature to get added to the DOM"
+  );
+
+  // Check the initial state of each feature.
+  ok(!Services.prefs.getBoolPref("test.featureA"), "initial state A");
+  ok(Services.prefs.getBoolPref("test.featureB"), "initial state B");
+  ok(!Services.prefs.getBoolPref(KNOWN_PREF_1), "initial state C");
+  ok(Services.prefs.getBoolPref(KNOWN_PREF_2), "initial state D");
+
+  // Modify the state of some of the features.
+  doc.getElementById("test-featureC").click();
+  doc.getElementById("test-featureD").click();
+  ok(!Services.prefs.getBoolPref("test.featureA"), "modified state A");
+  ok(Services.prefs.getBoolPref("test.featureB"), "modified state B");
+  ok(Services.prefs.getBoolPref(KNOWN_PREF_1), "modified state C");
+  ok(!Services.prefs.getBoolPref(KNOWN_PREF_2), "modified state D");
+
+  // State after reset.
+  let prefChangedPromise = new Promise(resolve => {
+    Services.prefs.addObserver(KNOWN_PREF_2, function observer() {
+      Services.prefs.removeObserver(KNOWN_PREF_2, observer);
+      resolve();
+    });
+  });
+  doc.getElementById("experimentalCategory-reset").click();
+  await prefChangedPromise;
+
+  // The preferences will be reset to the default value for the feature.
+  ok(!Services.prefs.getBoolPref("test.featureA"), "after reset state A");
+  ok(Services.prefs.getBoolPref("test.featureB"), "after reset state B");
+  ok(!Services.prefs.getBoolPref(KNOWN_PREF_1), "after reset state C");
+  ok(Services.prefs.getBoolPref(KNOWN_PREF_2), "after reset state D");
+  ok(
+    !doc.getElementById("test-featureA").checked,
+    "after reset checkbox state A"
+  );
+  ok(
+    doc.getElementById("test-featureB").checked,
+    "after reset checkbox state B"
+  );
+  ok(
+    !doc.getElementById("test-featureC").checked,
+    "after reset checkbox state C"
+  );
+  ok(
+    doc.getElementById("test-featureD").checked,
+    "after reset checkbox state D"
+  );
+
+  BrowserTestUtils.removeTab(gBrowser.selectedTab);
+});