1 files changed, 66 insertions, 0 deletions
diff --git a/devtools/client/responsive.html/test/browser/browser_device_width.js b/devtools/client/responsive.html/test/browser/browser_device_width.js
new file mode 100644
index 000000000..9489d8f0b
--- /dev/null
+++ b/devtools/client/responsive.html/test/browser/browser_device_width.js
@@ -0,0 +1,66 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const TEST_URL = "data:text/html;charset=utf-8,";
+
+addRDMTask(TEST_URL, function* ({ ui, manager }) {
+  ok(ui, "An instance of the RDM should be attached to the tab.");
+  yield setViewportSize(ui, manager, 110, 500);
+
+  info("Checking initial width/height properties.");
+  yield doInitialChecks(ui);
+
+  info("Changing the RDM size");
+  yield setViewportSize(ui, manager, 90, 500);
+
+  info("Checking for screen props");
+  yield checkScreenProps(ui);
+
+  info("Setting docShell.deviceSizeIsPageSize to false");
+  yield ContentTask.spawn(ui.getViewportBrowser(), {}, function* () {
+    let docShell = content.QueryInterface(Ci.nsIInterfaceRequestor)
+                          .getInterface(Ci.nsIWebNavigation)
+                          .QueryInterface(Ci.nsIDocShell);
+    docShell.deviceSizeIsPageSize = false;
+  });
+
+  info("Checking for screen props once again.");
+  yield checkScreenProps2(ui);
+});
+
+function* doInitialChecks(ui) {
+  let { innerWidth, matchesMedia } = yield grabContentInfo(ui);
+  is(innerWidth, 110, "initial width should be 110px");
+  ok(!matchesMedia, "media query shouldn't match.");
+}
+
+function* checkScreenProps(ui) {
+  let { matchesMedia, screen } = yield grabContentInfo(ui);
+  ok(matchesMedia, "media query should match");
+  isnot(window.screen.width, screen.width,
+        "screen.width should not be the size of the screen.");
+  is(screen.width, 90, "screen.width should be the page width");
+  is(screen.height, 500, "screen.height should be the page height");
+}
+
+function* checkScreenProps2(ui) {
+  let { matchesMedia, screen } = yield grabContentInfo(ui);
+  ok(!matchesMedia, "media query should be re-evaluated.");
+  is(window.screen.width, screen.width,
+     "screen.width should be the size of the screen.");
+}
+
+function grabContentInfo(ui) {
+  return ContentTask.spawn(ui.getViewportBrowser(), {}, function* () {
+    return {
+      screen: {
+        width: content.screen.width,
+        height: content.screen.height
+      },
+      innerWidth: content.innerWidth,
+      matchesMedia: content.matchMedia("(max-device-width:100px)").matches
+    };
+  });
+}