1 files changed, 30 insertions, 0 deletions
diff --git a/devtools/client/inspector/flexbox/test/browser_flexbox_non_flex_item_is_not_shown.js b/devtools/client/inspector/flexbox/test/browser_flexbox_non_flex_item_is_not_shown.js
new file mode 100644
index 0000000000..92422ea490
--- /dev/null
+++ b/devtools/client/inspector/flexbox/test/browser_flexbox_non_flex_item_is_not_shown.js
@@ -0,0 +1,30 @@
+/* Any copyright is dedicated to the Public Domain.
+http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that an element that is the child of a flex container but is not actually a flex
+// item is not shown in the sidebar when selected.
+
+const TEST_URI = `
+<div style="display:flex">
+  <div id="item" style="position:absolute;">test</div>
+</div>
+`;
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+  const { inspector, flexboxInspector } = await openLayoutView();
+  const { document: doc } = flexboxInspector;
+
+  info("Select the container's supposed flex item.");
+  await selectNode("#item", inspector);
+  const noFlexContainerOrItemSelected = doc.querySelector(
+    ".flex-accordion .devtools-sidepanel-no-result"
+  );
+
+  ok(
+    noFlexContainerOrItemSelected,
+    "The flexbox pane shows a message to select a flex container or item to continue."
+  );
+});