1 files changed, 53 insertions, 0 deletions
diff --git a/devtools/client/inspector/shared/test/browser_styleinspector_transform-highlighter-01.js b/devtools/client/inspector/shared/test/browser_styleinspector_transform-highlighter-01.js
new file mode 100644
index 0000000000..b4297a66c2
--- /dev/null
+++ b/devtools/client/inspector/shared/test/browser_styleinspector_transform-highlighter-01.js
@@ -0,0 +1,53 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that the css transform highlighter is created only when asked and only one
+// instance exists across the inspector
+
+const TEST_URI = `
+  <style type="text/css">
+    body {
+      transform: skew(16deg);
+    }
+  </style>
+  Test the css transform highlighter
+`;
+
+const TYPE = "CssTransformHighlighter";
+
+add_task(async function () {
+  await addTab("data:text/html;charset=utf-8," + encodeURIComponent(TEST_URI));
+  const { inspector, view } = await openRuleView();
+
+  let overlay = view.highlighters;
+
+  ok(!overlay.highlighters[TYPE], "No highlighter exists in the rule-view");
+  const h = await overlay._getHighlighter(TYPE);
+  ok(
+    overlay.highlighters[TYPE],
+    "The highlighter has been created in the rule-view"
+  );
+  is(h, overlay.highlighters[TYPE], "The right highlighter has been created");
+  const h2 = await overlay._getHighlighter(TYPE);
+  is(
+    h,
+    h2,
+    "The same instance of highlighter is returned everytime in the rule-view"
+  );
+
+  const onComputedViewReady = inspector.once("computed-view-refreshed");
+  const cView = selectComputedView(inspector);
+  await onComputedViewReady;
+  overlay = cView.highlighters;
+
+  ok(overlay.highlighters[TYPE], "The highlighter exists in the computed-view");
+  const h3 = await overlay._getHighlighter(TYPE);
+  is(
+    h,
+    h3,
+    "The same instance of highlighter is returned everytime " +
+      "in the computed-view"
+  );
+});