1 files changed, 37 insertions, 0 deletions
diff --git a/devtools/client/inspector/grids/test/browser_grids_grid-list-no-grids.js b/devtools/client/inspector/grids/test/browser_grids_grid-list-no-grids.js
new file mode 100644
index 0000000000..ce9cbc7866
--- /dev/null
+++ b/devtools/client/inspector/grids/test/browser_grids_grid-list-no-grids.js
@@ -0,0 +1,37 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that no grid list items and a "no grids available" message is displayed when
+// there are no grid containers on the page.
+
+const TEST_URI = `
+  <style type='text/css'>
+  </style>
+  <div id="grid">
+    <div id="cell1">cell1</div>
+    <div id="cell2">cell2</div>
+  </div>
+`;
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+  const { inspector, gridInspector } = await openLayoutView();
+  const { document: doc } = gridInspector;
+  const { highlighters } = inspector;
+
+  await selectNode("#grid", inspector);
+  const noGridList = doc.querySelector(
+    "#layout-grid-section .devtools-sidepanel-no-result"
+  );
+  const gridList = doc.getElementById("grid-list");
+
+  info("Checking the initial state of the Grid Inspector.");
+  ok(noGridList, "The message no grid containers is displayed.");
+  ok(!gridList, "No grid containers are listed.");
+  ok(
+    !highlighters.gridHighlighters.size,
+    "No CSS grid highlighter exists in the highlighters overlay."
+  );
+});