test: Added tests for closing glance, b=(no-bug), c=glance, tests

src/zen/glance/ZenGlanceManager.mjs

@@ -127,7 +127,7 @@
         if (gZenVerticalTabsManager._prefsRightSide) {
           this.sidebarButtons.setAttribute('right', true);
         } else {
-          this.sidebarButtons.removeAttribute('right');
+          this.sidebarButtons.setAttribute('right', false);
         }
         for (const button of this.sidebarButtons.querySelectorAll('toolbarbutton')) {
           button.style.opacity = 0;
@@ -256,7 +256,12 @@
       hasFocused = false,
       skipPermitUnload = false,
     } = {}) {
-      if (this._animating || !this.#currentBrowser || this.animatingOpen || this._duringOpening) {
+      if (
+        (this._animating && !onTabClose) ||
+        !this.#currentBrowser ||
+        (this.animatingOpen && !onTabClose) ||
+        this._duringOpening
+      ) {
         return;
       }
 

src/zen/tests/glance/browser.toml

@@ -5,3 +5,4 @@ support-files = [
 
 ["browser_glance_basic.js"]
 ["browser_glance_expand.js"]
+["browser_glance_close.js"]

src/zen/tests/glance/browser_glance_close.js

@@ -0,0 +1,25 @@
+/* Any copyright is dedicated to the Public Domain.
+   https://creativecommons.org/publicdomain/zero/1.0/ */
+
+'use strict';
+
+add_task(async function test_Glance_Basic_Close() {
+  const currentTab = gBrowser.selectedTab;
+  await openGlanceOnTab(async (glanceTab) => {
+    ok(
+      currentTab.hasAttribute('glance-id'),
+      'The glance tab should have the zen-glance-tab attribute'
+    );
+    await BrowserTestUtils.removeTab(glanceTab);
+    await new Promise((resolve) => {
+      setTimeout(() => {
+        resolve();
+      }, 500);
+    });
+    ok(
+      !currentTab.hasAttribute('glance-id'),
+      'The glance tab should not have the zen-glance-tab attribute'
+    );
+    await BrowserTestUtils.removeTab(glanceTab);
+  }, false);
+});