1 files changed, 68 insertions, 0 deletions
diff --git a/devtools/client/inspector/test/browser_inspector_highlighter-autohide-config_03.js b/devtools/client/inspector/test/browser_inspector_highlighter-autohide-config_03.js
new file mode 100644
index 0000000000..6c13314d2b
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+++ b/devtools/client/inspector/test/browser_inspector_highlighter-autohide-config_03.js
@@ -0,0 +1,68 @@
+/* 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 that configuring a highlighter to autohide twice
+// will replace the first timer and hide just once.
+add_task(async function () {
+  info("Loading the test document and opening the inspector");
+  const { inspector } = await openInspectorForURL(
+    "data:text/html;charset=utf-8,<p id='one'>TEST 1</p>"
+  );
+
+  const ONE_SECOND = 1000;
+  const HALF_SECOND = 500;
+  const nodeFront = await getNodeFront("#one", inspector);
+
+  const waitForShowEvents = waitForNEvents(
+    inspector.highlighters,
+    "highlighter-shown",
+    2
+  );
+  const waitForHideEvents = waitForNEvents(
+    inspector.highlighters,
+    "highlighter-hidden",
+    1
+  );
+
+  info("Show Box Model Highlighter, then hide after half a second");
+  await inspector.highlighters.showHighlighterTypeForNode(
+    inspector.highlighters.TYPES.BOXMODEL,
+    nodeFront,
+    { duration: HALF_SECOND }
+  );
+
+  info("Show Box Model Highlighter again, then hide after one second");
+  await inspector.highlighters.showHighlighterTypeForNode(
+    inspector.highlighters.TYPES.BOXMODEL,
+    nodeFront,
+    { duration: ONE_SECOND }
+  );
+
+  info("Waiting for 2 highlighter-shown and 1 highlighter-hidden event");
+  await Promise.all([waitForShowEvents, waitForHideEvents]);
+
+  /*
+  Since the second duration passed is longer than the first and is supposed to overwrite
+  the first, it is reasonable to expect that the "highlighter-hidden" event was emitted
+  after the second (longer) duration expired. As an added check, we naively wait for an
+  additional time amounting to the sum of both durations to check if the first timer was
+  somehow not overwritten and fires another "highlighter-hidden" event.
+   */
+  let wasEmitted = false;
+  const waitForExtraEvent = new Promise((resolve, reject) => {
+    const _handler = () => {
+      wasEmitted = true;
+      resolve();
+    };
+
+    inspector.highlighters.on("highlighter-hidden", _handler, { once: true });
+  });
+
+  info("Wait to see if another highlighter-hidden event is emitted");
+  await Promise.race([waitForExtraEvent, wait(HALF_SECOND + ONE_SECOND)]);
+
+  is(wasEmitted, false, "An extra highlighter-hidden event was not emitted");
+});