1 files changed, 61 insertions, 0 deletions
diff --git a/devtools/client/inspector/markup/test/browser_markup_toggle_02.js b/devtools/client/inspector/markup/test/browser_markup_toggle_02.js
new file mode 100644
index 0000000000..95c7d9d28d
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+++ b/devtools/client/inspector/markup/test/browser_markup_toggle_02.js
@@ -0,0 +1,61 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test toggling (expand/collapse) elements by dbl-clicking on tag lines
+
+const TEST_URL = URL_ROOT + "doc_markup_toggle.html";
+
+add_task(async function () {
+  const { inspector } = await openInspectorForURL(TEST_URL);
+
+  info("Getting the container for the UL parent element");
+  const container = await getContainerForSelector("ul", inspector);
+
+  info("Dbl-clicking on the UL parent expander, and waiting for children");
+  const onChildren = waitForChildrenUpdated(inspector);
+  const onUpdated = inspector.once("inspector-updated");
+  EventUtils.synthesizeMouseAtCenter(
+    container.tagLine,
+    { clickCount: 2 },
+    inspector.markup.doc.defaultView
+  );
+  await onChildren;
+  await onUpdated;
+
+  info("Checking that child LI elements have been created");
+  let numLi = await getNumberOfMatchingElementsInContentPage("li");
+  for (let i = 0; i < numLi; i++) {
+    const liContainer = await getContainerForSelector(
+      "li:nth-child(" + (i + 1) + ")",
+      inspector
+    );
+    ok(liContainer, "A container for the child LI element was created");
+  }
+  ok(container.expanded, "Parent UL container is expanded");
+
+  info("Dbl-clicking again on the UL expander");
+  // No need to wait, this is a local, synchronous operation where nodes are
+  // only hidden from the view, not destroyed
+  EventUtils.synthesizeMouseAtCenter(
+    container.tagLine,
+    { clickCount: 2 },
+    inspector.markup.doc.defaultView
+  );
+
+  info("Checking that child LI elements have been hidden");
+  numLi = await getNumberOfMatchingElementsInContentPage("li");
+  for (let i = 0; i < numLi; i++) {
+    const liContainer = await getContainerForSelector(
+      "li:nth-child(" + (i + 1) + ")",
+      inspector
+    );
+    is(
+      liContainer.elt.getClientRects().length,
+      0,
+      "The container for the child LI element was hidden"
+    );
+  }
+  ok(!container.expanded, "Parent UL container is collapsed");
+});