test: Fixed welcome page tests and added empty tab checks, b=no-bug, c=tests, tabs, welcome

src/zen/tests/tabs/browser.toml

@@ -7,6 +7,7 @@ support-files = [
   "head.js",
 ]
 
+["browser_tabs_empty_checks.js"]
 ["browser_drag_drop_vertical.js"]
 tags = [
   "drag-drop",

src/zen/tests/tabs/browser_tabs_empty_checks.js

@@ -0,0 +1,28 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_Empty_Tab_Transparent() {
+  const emptyTab = gZenWorkspaces._emptyTab;
+  ok(emptyTab, 'Empty tab should exist');
+  ok(emptyTab.parentElement, 'Empty tab should be in the DOM');
+  ok(emptyTab.hasAttribute('zen-empty-tab'), 'Empty tab should have the zen-empty-tab attribute');
+  ok(
+    emptyTab.linkedBrowser.hasAttribute('transparent'),
+    'Empty tab should have the transparent attribute'
+  );
+});
+
+add_task(async function test_Empty_Tab_Always_First() {
+  ok(gBrowser.tabs[0].hasAttribute('zen-empty-tab'), 'First tab should be the empty tab');
+  await BrowserTestUtils.withNewTab(
+    {
+      gBrowser,
+      url: 'http://example.com',
+    },
+    async () => {
+      ok(gBrowser.tabs[0].hasAttribute('zen-empty-tab'), 'First tab should be the empty tab');
+    }
+  );
+});

src/zen/tests/welcome/browser_welcome.js

@@ -168,7 +168,12 @@ add_task(async function test_Welcome_Steps() {
       }
       group.delete();
       resolve();
-    }, 5000); // Wait for the transition to complete
+    }, 3000); // Wait for the transition to complete
   });
+  for (const tab of gBrowser.tabs) {
+    if (tab.pinned) {
+      gBrowser.removeTab(tab);
+    }
+  }
   ok(true, 'Welcome process completed successfully');
 });