1 files changed, 60 insertions, 0 deletions
diff --git a/browser/base/content/test/tabs/browser_positional_attributes.js b/browser/base/content/test/tabs/browser_positional_attributes.js
new file mode 100644
index 0000000000..619c5cc517
--- /dev/null
+++ b/browser/base/content/test/tabs/browser_positional_attributes.js
@@ -0,0 +1,60 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+var tabs = [];
+
+function addTab(aURL) {
+  tabs.push(
+    BrowserTestUtils.addTab(gBrowser, aURL, {
+      skipAnimation: true,
+    })
+  );
+}
+
+function switchTab(index) {
+  return BrowserTestUtils.switchTab(gBrowser, gBrowser.tabs[index]);
+}
+
+function testAttrib(tabIndex, attrib, expected) {
+  is(
+    gBrowser.tabs[tabIndex].hasAttribute(attrib),
+    expected,
+    `tab #${tabIndex} should${
+      expected ? "" : "n't"
+    } have the ${attrib} attribute`
+  );
+}
+
+add_setup(async function () {
+  is(gBrowser.tabs.length, 1, "one tab is open initially");
+
+  addTab("http://mochi.test:8888/#0");
+  addTab("http://mochi.test:8888/#1");
+  addTab("http://mochi.test:8888/#2");
+  addTab("http://mochi.test:8888/#3");
+
+  is(gBrowser.tabs.length, 5, "five tabs are open after setup");
+});
+
+// Add several new tabs in sequence, hiding some, to ensure that the
+// correct attributes get set
+add_task(async function test() {
+  testAttrib(0, "visuallyselected", true);
+
+  await switchTab(2);
+
+  testAttrib(2, "visuallyselected", true);
+});
+
+add_task(async function test_pinning() {
+  await switchTab(3);
+  testAttrib(3, "visuallyselected", true);
+  // Causes gBrowser.tabs to change indices
+  gBrowser.pinTab(gBrowser.tabs[3]);
+  testAttrib(0, "visuallyselected", true);
+});
+
+add_task(function cleanup() {
+  tabs.forEach(gBrowser.removeTab, gBrowser);
+});