1 files changed, 67 insertions, 0 deletions
diff --git a/devtools/client/responsivedesign/test/browser_responsivecomputedview.js b/devtools/client/responsivedesign/test/browser_responsivecomputedview.js
new file mode 100644
index 000000000..eee2dbc03
--- /dev/null
+++ b/devtools/client/responsivedesign/test/browser_responsivecomputedview.js
@@ -0,0 +1,67 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Check that when the viewport is resized, the computed-view refreshes.
+
+const TEST_URI = "data:text/html;charset=utf-8,<html><style>" +
+                 "div {" +
+                 "  width: 500px;" +
+                 "  height: 10px;" +
+                 "  background: purple;" +
+                 "} " +
+                 "@media screen and (max-width: 200px) {" +
+                 "  div { " +
+                 "    width: 100px;" +
+                 "  }" +
+                 "};" +
+                 "</style><div></div></html>";
+
+add_task(function* () {
+  yield addTab(TEST_URI);
+
+  info("Open the responsive design mode and set its size to 500x500 to start");
+  let { rdm, manager } = yield openRDM();
+  yield setSize(rdm, manager, 500, 500);
+
+  info("Open the inspector, computed-view and select the test node");
+  let {inspector, view} = yield openComputedView();
+  yield selectNode("div", inspector);
+
+  info("Try shrinking the viewport and checking the applied styles");
+  yield testShrink(view, inspector, rdm, manager);
+
+  info("Try growing the viewport and checking the applied styles");
+  yield testGrow(view, inspector, rdm, manager);
+
+  yield closeRDM(rdm);
+  yield closeToolbox();
+});
+
+function* testShrink(computedView, inspector, rdm, manager) {
+  is(computedWidth(computedView), "500px", "Should show 500px initially.");
+
+  let onRefresh = inspector.once("computed-view-refreshed");
+  yield setSize(rdm, manager, 100, 100);
+  yield onRefresh;
+
+  is(computedWidth(computedView), "100px", "Should be 100px after shrinking.");
+}
+
+function* testGrow(computedView, inspector, rdm, manager) {
+  let onRefresh = inspector.once("computed-view-refreshed");
+  yield setSize(rdm, manager, 500, 500);
+  yield onRefresh;
+
+  is(computedWidth(computedView), "500px", "Should be 500px after growing.");
+}
+
+function computedWidth(computedView) {
+  for (let prop of computedView.propertyViews) {
+    if (prop.name === "width") {
+      return prop.valueNode.textContent;
+    }
+  }
+  return null;
+}