1 files changed, 59 insertions, 0 deletions
diff --git a/devtools/client/inspector/grids/test/browser_grids_display-setting-extend-grid-lines.js b/devtools/client/inspector/grids/test/browser_grids_display-setting-extend-grid-lines.js
new file mode 100644
index 0000000000..89f2bb36dd
--- /dev/null
+++ b/devtools/client/inspector/grids/test/browser_grids_display-setting-extend-grid-lines.js
@@ -0,0 +1,59 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that the 'Extend grid lines infinitely' grid highlighter setting will update
+// the redux store and pref setting.
+
+const TEST_URI = `
+  <style type='text/css'>
+    #grid {
+      display: grid;
+    }
+  </style>
+  <div id="grid">
+    <div id="cell1">cell1</div>
+    <div id="cell2">cell2</div>
+  </div>
+`;
+
+const SHOW_INFINITE_LINES_PREF = "devtools.gridinspector.showInfiniteLines";
+
+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 { store } = inspector;
+
+  await selectNode("#grid", inspector);
+  const checkbox = doc.getElementById("grid-setting-extend-grid-lines");
+
+  ok(
+    !Services.prefs.getBoolPref(SHOW_INFINITE_LINES_PREF),
+    "'Extend grid lines infinitely' is pref off by default."
+  );
+
+  info("Toggling ON the 'Extend grid lines infinitely' setting.");
+  let onCheckboxChange = waitUntilState(
+    store,
+    state => state.highlighterSettings.showInfiniteLines
+  );
+  checkbox.click();
+  await onCheckboxChange;
+
+  info("Toggling OFF the 'Extend grid lines infinitely' setting.");
+  onCheckboxChange = waitUntilState(
+    store,
+    state => !state.highlighterSettings.showInfiniteLines
+  );
+  checkbox.click();
+  await onCheckboxChange;
+
+  ok(
+    !Services.prefs.getBoolPref(SHOW_INFINITE_LINES_PREF),
+    "'Extend grid lines infinitely' is pref off."
+  );
+
+  Services.prefs.clearUserPref(SHOW_INFINITE_LINES_PREF);
+});