1 files changed, 88 insertions, 0 deletions
diff --git a/devtools/client/responsive/test/browser/browser_viewport_resizing_after_reload.js b/devtools/client/responsive/test/browser/browser_viewport_resizing_after_reload.js
new file mode 100644
index 0000000000..ad750326ae
--- /dev/null
+++ b/devtools/client/responsive/test/browser/browser_viewport_resizing_after_reload.js
@@ -0,0 +1,88 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test viewport resizing, with and without meta viewport support.
+
+const TEST_URL =
+  "data:text/html;charset=utf-8," +
+  '<head><meta name="viewport" content="width=device-width"/></head>' +
+  '<body style="margin:0px;min-width:600px">' +
+  '<div style="width:100%;height:100px;background-color:black"></div>' +
+  '<div style="width:100%;height:1100px;background-color:lightblue"></div>' +
+  "</body>";
+
+addRDMTask(TEST_URL, async function ({ ui, manager }) {
+  info("--- Starting viewport test output ---");
+
+  // We're going to take a 300,600 viewport (before), reload it,
+  // then resize it to 600,300 (after) and then resize it back.
+  // At the before and after points, we'll measure zoom and the
+  // layout viewport width and height.
+  const expected = [
+    {
+      metaSupport: false,
+      before: [1.0, 300, 600],
+      after: [1.0, 600, 300],
+    },
+    {
+      metaSupport: true,
+      before: [0.5, 300, 600],
+      after: [1.0, 600, 300],
+    },
+  ];
+
+  for (const e of expected) {
+    const b = e.before;
+    const a = e.after;
+
+    const message = "Meta Viewport " + (e.metaSupport ? "ON" : "OFF");
+
+    // Ensure meta viewport is set.
+    info(message + " setting meta viewport support.");
+    await setTouchAndMetaViewportSupport(ui, e.metaSupport);
+
+    // Get to the initial size and check values.
+    await setViewportSizeAndAwaitReflow(ui, manager, 300, 600);
+    await testViewportZoomWidthAndHeight(
+      message + " before resize",
+      ui,
+      b[0],
+      b[1],
+      b[2]
+    );
+
+    // Force a reload.
+    await reloadBrowser();
+
+    // Check initial values again.
+    await testViewportZoomWidthAndHeight(
+      message + " after reload",
+      ui,
+      b[0],
+      b[1],
+      b[2]
+    );
+
+    // Move to the smaller size.
+    await setViewportSizeAndAwaitReflow(ui, manager, 600, 300);
+    await testViewportZoomWidthAndHeight(
+      message + " after resize",
+      ui,
+      a[0],
+      a[1],
+      a[2]
+    );
+
+    // Go back to the initial size and check again.
+    await setViewportSizeAndAwaitReflow(ui, manager, 300, 600);
+    await testViewportZoomWidthAndHeight(
+      message + " return to initial size",
+      ui,
+      b[0],
+      b[1],
+      b[2]
+    );
+  }
+});