1 files changed, 72 insertions, 0 deletions
diff --git a/devtools/client/responsive/test/browser/browser_viewport_resizing_fixed_width.js b/devtools/client/responsive/test/browser/browser_viewport_resizing_fixed_width.js
new file mode 100644
index 0000000000..46a2529b12
--- /dev/null
+++ b/devtools/client/responsive/test/browser/browser_viewport_resizing_fixed_width.js
@@ -0,0 +1,72 @@
+/* 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=300"/></head>' +
+  "<body>meta viewport width 300</body>";
+addRDMTask(TEST_URL, async function ({ ui, manager }) {
+  info("--- Starting viewport test output ---");
+
+  // We're going to take a 600,300 viewport (before) and resize it
+  // to 50,50 (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, 600, 300],
+      after: [1.0, 50, 50], // Zoom is unaffected.
+    },
+    {
+      metaSupport: true,
+      before: [2.0, 300, 150],
+      after: [0.25, 300, 300], // This checks that min-zoom is active.
+    },
+  ];
+
+  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, 600, 300);
+    await testViewportZoomWidthAndHeight(
+      message + " before resize",
+      ui,
+      b[0],
+      b[1],
+      b[2]
+    );
+
+    // Move to the smaller size.
+    await setViewportSizeAndAwaitReflow(ui, manager, 50, 50);
+    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, 600, 300);
+    await testViewportZoomWidthAndHeight(
+      message + " return to initial size",
+      ui,
+      b[0],
+      b[1],
+      b[2]
+    );
+  }
+});