Bug 1641960 - Introduce some Mac selection tests for inputs. r=morgan

Differential Revision: https://phabricator.services.mozilla.com/D77531

accessible/tests/browser/mac/browser.ini

@@ -24,3 +24,4 @@ support-files =
 [browser_required.js]
 [browser_popupbutton.js]
 [browser_mathml.js]
+[browser_input.js]

accessible/tests/browser/mac/browser_input.js

+/* 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";
+
+/**
+ * Input selection test
+ */
+addAccessibleTask(
+  `<input aria-label="Name" id="input" value="Elmer Fudd">`,
+  async (browser, accDoc) => {
+    let input = getNativeInterface(accDoc, "input");
+
+    is(input.getAttributeValue("AXDescription"), "Name", "Correct input label");
+    is(input.getAttributeValue("AXTitle"), "", "Correct input title");
+    is(
+      input.getAttributeValue("AXNumberOfCharacters"),
+      10,
+      "Correct length of value"
+    );
+
+    ok(input.attributeNames.includes("AXSelectedText"), "Has AXSelecetdText");
+    ok(
+      input.attributeNames.includes("AXSelectedTextRange"),
+      "Has AXSelecetdTextRange"
+    );
+
+    // XXX: Need to look into why we send so many AXSelectedTextChanged notifications.
+    let evt = Promise.all([
+      waitForMacEvent("AXFocusedUIElementChanged"),
+      waitForMacEvent("AXSelectedTextChanged"),
+      waitForMacEvent("AXSelectedTextChanged"),
+      waitForMacEvent("AXSelectedTextChanged"),
+    ]);
+    await SpecialPowers.spawn(browser, [], () => {
+      let elm = content.document.getElementById("input");
+      elm.focus();
+      elm.setSelectionRange(6, 9);
+    });
+    await evt;
+
+    is(
+      input.getAttributeValue("AXSelectedText"),
+      "Fud",
+      "Correct text is selected"
+    );
+
+    Assert.deepEqual(
+      input.getAttributeValue("AXSelectedTextRange"),
+      [6, 3],
+      "correct range selected"
+    );
+
+    ok(
+      input.isAttributeSettable("AXSelectedTextRange"),
+      "AXSelectedTextRange is settable"
+    );
+
+    evt = Promise.all([
+      waitForMacEvent("AXSelectedTextChanged"),
+      waitForMacEvent("AXSelectedTextChanged"),
+    ]);
+    input.setAttributeValue("AXSelectedTextRange", NSRange(1, 7));
+
+    Assert.deepEqual(
+      input.getAttributeValue("AXSelectedTextRange"),
+      [1, 7],
+      "correct range selected"
+    );
+
+    is(
+      input.getAttributeValue("AXSelectedText"),
+      "lmer Fu",
+      "Correct text is selected"
+    );
+
+    let domSelection = await SpecialPowers.spawn(browser, [], () => {
+      let elm = content.document.getElementById("input");
+      return [elm.selectionStart, elm.selectionEnd];
+    });
+
+    Assert.deepEqual(domSelection, [1, 8], "correct DOM selection");
+  }
+);