1 files changed, 146 insertions, 0 deletions
diff --git a/accessible/tests/browser/head.js b/accessible/tests/browser/head.js
new file mode 100644
index 0000000000..e7645f7f1c
--- /dev/null
+++ b/accessible/tests/browser/head.js
@@ -0,0 +1,146 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/* exported initAccService, shutdownAccService, waitForEvent, setE10sPrefs,
+            unsetE10sPrefs, accConsumersChanged */
+
+// Load the shared-head file first.
+Services.scriptloader.loadSubScript(
+  "chrome://mochitests/content/browser/accessible/tests/browser/shared-head.js",
+  this
+);
+
+const { CommonUtils } = ChromeUtils.importESModule(
+  "chrome://mochitests/content/browser/accessible/tests/browser/Common.sys.mjs"
+);
+
+/**
+ * Set e10s related preferences in the test environment.
+ * @return {Promise} promise that resolves when preferences are set.
+ */
+function setE10sPrefs() {
+  return new Promise(resolve =>
+    SpecialPowers.pushPrefEnv(
+      {
+        set: [["browser.tabs.remote.autostart", true]],
+      },
+      resolve
+    )
+  );
+}
+
+/**
+ * Unset e10s related preferences in the test environment.
+ * @return {Promise} promise that resolves when preferences are unset.
+ */
+function unsetE10sPrefs() {
+  return new Promise(resolve => {
+    SpecialPowers.popPrefEnv(resolve);
+  });
+}
+
+/**
+ * Capture when 'a11y-consumers-changed' event is fired.
+ *
+ * @param  {?Object} target
+ *         [optional] browser object that indicates that accessibility service
+ *         is in content process.
+ * @return {Array}
+ *         List of promises where first one is the promise for when the event
+ *         observer is added and the second one for when the event is observed.
+ */
+function accConsumersChanged(target) {
+  return target
+    ? [
+        SpecialPowers.spawn(target, [], () =>
+          content.CommonUtils.addAccConsumersChangedObserver()
+        ),
+        SpecialPowers.spawn(target, [], () =>
+          content.CommonUtils.observeAccConsumersChanged()
+        ),
+      ]
+    : [
+        CommonUtils.addAccConsumersChangedObserver(),
+        CommonUtils.observeAccConsumersChanged(),
+      ];
+}
+
+/**
+ * Capture when accessibility service is initialized.
+ *
+ * @param  {?Object} target
+ *         [optional] browser object that indicates that accessibility service
+ *         is expected to be initialized in content process.
+ * @return {Array}
+ *         List of promises where first one is the promise for when the event
+ *         observer is added and the second one for when the event is observed.
+ */
+function initAccService(target) {
+  return target
+    ? [
+        SpecialPowers.spawn(target, [], () =>
+          content.CommonUtils.addAccServiceInitializedObserver()
+        ),
+        SpecialPowers.spawn(target, [], () =>
+          content.CommonUtils.observeAccServiceInitialized()
+        ),
+      ]
+    : [
+        CommonUtils.addAccServiceInitializedObserver(),
+        CommonUtils.observeAccServiceInitialized(),
+      ];
+}
+
+/**
+ * Capture when accessibility service is shutdown.
+ *
+ * @param  {?Object} target
+ *         [optional] browser object that indicates that accessibility service
+ *         is expected to be shutdown in content process.
+ * @return {Array}
+ *         List of promises where first one is the promise for when the event
+ *         observer is added and the second one for when the event is observed.
+ */
+function shutdownAccService(target) {
+  return target
+    ? [
+        SpecialPowers.spawn(target, [], () =>
+          content.CommonUtils.addAccServiceShutdownObserver()
+        ),
+        SpecialPowers.spawn(target, [], () =>
+          content.CommonUtils.observeAccServiceShutdown()
+        ),
+      ]
+    : [
+        CommonUtils.addAccServiceShutdownObserver(),
+        CommonUtils.observeAccServiceShutdown(),
+      ];
+}
+
+/**
+ * Simpler verions of waitForEvent defined in
+ * accessible/tests/browser/events.js
+ */
+function waitForEvent(eventType, expectedId) {
+  return new Promise(resolve => {
+    let eventObserver = {
+      observe(subject) {
+        let event = subject.QueryInterface(Ci.nsIAccessibleEvent);
+        let id;
+        try {
+          id = event.accessible.id;
+        } catch (e) {
+          // This can throw NS_ERROR_FAILURE.
+        }
+        if (event.eventType === eventType && id === expectedId) {
+          Services.obs.removeObserver(this, "accessible-event");
+          resolve(event);
+        }
+      },
+    };
+    Services.obs.addObserver(eventObserver, "accessible-event");
+  });
+}