1 files changed, 45 insertions, 0 deletions
diff --git a/dom/base/test/viewport_helpers.js b/dom/base/test/viewport_helpers.js
new file mode 100644
index 0000000000..a89b4f16dc
--- /dev/null
+++ b/dom/base/test/viewport_helpers.js
@@ -0,0 +1,45 @@
+function scaleRatio(scale) {
+  return {
+    set: [
+      ["layout.css.devPixelsPerPx", "" + scale],
+      ["apz.allow_zooming", true],
+      ["dom.meta-viewport.enabled", true],
+    ],
+  };
+}
+
+function getViewportInfo(aDisplayWidth, aDisplayHeight) {
+  let defaultZoom = {},
+    allowZoom = {},
+    minZoom = {},
+    maxZoom = {},
+    width = {},
+    height = {},
+    autoSize = {};
+
+  let cwu = SpecialPowers.getDOMWindowUtils(window);
+  cwu.getViewportInfo(
+    aDisplayWidth,
+    aDisplayHeight,
+    defaultZoom,
+    allowZoom,
+    minZoom,
+    maxZoom,
+    width,
+    height,
+    autoSize
+  );
+  return {
+    defaultZoom: defaultZoom.value,
+    minZoom: minZoom.value,
+    maxZoom: maxZoom.value,
+    width: width.value,
+    height: height.value,
+    autoSize: autoSize.value,
+    allowZoom: allowZoom.value,
+  };
+}
+
+function fuzzeq(a, b, msg) {
+  ok(Math.abs(a - b) < 1e-6, msg);
+}