1 files changed, 91 insertions, 0 deletions
diff --git a/devtools/client/inspector/test/browser_inspector_highlighter-cssgrid_01.js b/devtools/client/inspector/test/browser_inspector_highlighter-cssgrid_01.js
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+++ b/devtools/client/inspector/test/browser_inspector_highlighter-cssgrid_01.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+// Test the creation of the canvas highlighter element of the css grid highlighter.
+
+const TEST_URL = `
+  <style type='text/css'>
+    #grid {
+      display: grid;
+    }
+    #cell1 {
+      grid-column: 1;
+      grid-row: 1;
+    }
+    #cell2 {
+      grid-column: 2;
+      grid-row: 1;
+    }
+    #cell3 {
+      grid-column: 1;
+      grid-row: 2;
+    }
+    #cell4 {
+      grid-column: 2;
+      grid-row: 2;
+    }
+  </style>
+  <div id="grid">
+    <div id="cell1">cell1</div>
+    <div id="cell2">cell2</div>
+    <div id="cell3">cell3</div>
+    <div id="cell4">cell4</div>
+  </div>
+`;
+
+const HIGHLIGHTER_TYPE = "CssGridHighlighter";
+
+add_task(async function () {
+  const { inspector, highlighterTestFront } = await openInspectorForURL(
+    "data:text/html;charset=utf-8," + encodeURIComponent(TEST_URL)
+  );
+  const front = inspector.inspectorFront;
+  const highlighter = await front.getHighlighterByType(HIGHLIGHTER_TYPE);
+
+  await isHiddenByDefault(highlighterTestFront, highlighter);
+  await isVisibleWhenShown(highlighterTestFront, inspector, highlighter);
+
+  await highlighter.finalize();
+});
+
+async function isHiddenByDefault(highlighterTestFront, highlighterFront) {
+  info("Checking that the highlighter is hidden by default");
+
+  const hidden = await highlighterTestFront.getHighlighterNodeAttribute(
+    "css-grid-canvas",
+    "hidden",
+    highlighterFront
+  );
+  ok(hidden, "The highlighter is hidden by default");
+}
+
+async function isVisibleWhenShown(
+  highlighterTestFront,
+  inspector,
+  highlighterFront
+) {
+  info("Asking to show the highlighter on the test node");
+
+  const node = await getNodeFront("#grid", inspector);
+  await highlighterFront.show(node);
+
+  let hidden = await highlighterTestFront.getHighlighterNodeAttribute(
+    "css-grid-canvas",
+    "hidden",
+    highlighterFront
+  );
+  ok(!hidden, "The highlighter is visible");
+
+  info("Hiding the highlighter");
+  await highlighterFront.hide();
+
+  hidden = await highlighterTestFront.getHighlighterNodeAttribute(
+    "css-grid-canvas",
+    "hidden",
+    highlighterFront
+  );
+  ok(hidden, "The highlighter is hidden");
+}