1 files changed, 64 insertions, 0 deletions
diff --git a/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_devtoolstoolbox_zoom.js b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_devtoolstoolbox_zoom.js
new file mode 100644
index 0000000000..816e2594e1
--- /dev/null
+++ b/devtools/client/aboutdebugging/test/browser/browser_aboutdebugging_devtoolstoolbox_zoom.js
@@ -0,0 +1,64 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+/* import-globals-from helper-collapsibilities.js */
+Services.scriptloader.loadSubScript(
+  CHROME_URL_ROOT + "helper-collapsibilities.js",
+  this
+);
+
+const L10N = new LocalizationHelper(
+  "devtools/client/locales/toolbox.properties"
+);
+
+// Check that the about:devtools-toolbox tab can be zoomed in and that the zoom
+// persists after switching tabs.
+add_task(async function () {
+  info("Force all debug target panes to be expanded");
+  prepareCollapsibilitiesTest();
+
+  const { document, tab, window } = await openAboutDebugging();
+  await selectThisFirefoxPage(document, window.AboutDebugging.store);
+  const { devtoolsTab, devtoolsWindow } = await openAboutDevtoolsToolbox(
+    document,
+    tab,
+    window
+  );
+
+  is(getZoom(devtoolsWindow), 1, "default zoom level correct");
+
+  info("Increase the zoom level");
+
+  // Note that we read the shortcut from the toolbox properties, but that should
+  // match the default browser shortcut `full-zoom-enlarge-shortcut`.
+  synthesizeKeyShortcut(L10N.getStr("toolbox.zoomIn.key"));
+  await waitFor(() => getZoom(devtoolsWindow) > 1);
+  is(getZoom(devtoolsWindow).toFixed(2), "1.10", "zoom level increased");
+
+  info("Switch tabs between about:debugging and the toolbox tab");
+  gBrowser.selectedTab = tab;
+  gBrowser.selectedTab = devtoolsTab;
+
+  info("Wait for the browser to reapply the zoom");
+  await wait(500);
+
+  is(
+    getZoom(devtoolsWindow).toFixed(2),
+    "1.10",
+    "zoom level was restored after switching tabs"
+  );
+
+  info("Restore the default zoom level");
+  synthesizeKeyShortcut(L10N.getStr("toolbox.zoomReset.key"));
+  await waitFor(() => getZoom(devtoolsWindow) === 1);
+  is(getZoom(devtoolsWindow), 1, "default zoom level restored");
+
+  await closeAboutDevtoolsToolbox(document, devtoolsTab, window);
+  await removeTab(tab);
+});
+
+function getZoom(win) {
+  return win.browsingContext.fullZoom;
+}