1 files changed, 49 insertions, 0 deletions
diff --git a/devtools/client/inspector/flexbox/test/browser_flexbox_item_list_01.js b/devtools/client/inspector/flexbox/test/browser_flexbox_item_list_01.js
new file mode 100644
index 0000000000..d7a8ae184a
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+++ b/devtools/client/inspector/flexbox/test/browser_flexbox_item_list_01.js
@@ -0,0 +1,49 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+const {
+  getStr,
+} = require("resource://devtools/client/inspector/layout/utils/l10n.js");
+
+// Test the flex item list is empty when there are no flex items for the selected flex
+// container.
+
+const TEST_URI = `
+  <div id="container" style="display:flex">
+  </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;
+  const HIGHLIGHTER_TYPE = inspector.highlighters.TYPES.FLEXBOX;
+  const { getActiveHighlighter } = getHighlighterTestHelpers(inspector);
+
+  const onFlexHeaderRendered = waitForDOM(doc, ".flex-header");
+  await selectNode("#container", inspector);
+  const [flexHeader] = await onFlexHeaderRendered;
+  const flexHighlighterToggle = flexHeader.querySelector(
+    "#flexbox-checkbox-toggle"
+  );
+  const flexItemListHeader = doc.querySelector(".flex-item-list-header");
+
+  info("Checking the state of the Flexbox Inspector.");
+  ok(flexHeader, "The flex container header is rendered.");
+  ok(flexHighlighterToggle, "The flexbox highlighter toggle is rendered.");
+  is(
+    flexItemListHeader.textContent,
+    getStr("flexbox.noFlexItems"),
+    "The flex item list header shows 'No flex items' when there are no items."
+  );
+  ok(
+    !flexHighlighterToggle.checked,
+    "The flexbox highlighter toggle is unchecked."
+  );
+  ok(
+    !getActiveHighlighter(HIGHLIGHTER_TYPE),
+    "No flexbox highlighter is shown."
+  );
+});