1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/client/jsonview/test/browser_jsonview_favicon.js b/devtools/client/jsonview/test/browser_jsonview_favicon.js
new file mode 100644
index 0000000000..b03bf1a94d
--- /dev/null
+++ b/devtools/client/jsonview/test/browser_jsonview_favicon.js
@@ -0,0 +1,46 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Check that, if browser.chrome.guess_favicon is enabled, the favicon.ico will
+// be loaded for the JSON viewer. The favicon could be prevented from loading
+// by a too strict CSP (Bug 1872504).
+
+const { HttpServer } = ChromeUtils.importESModule(
+  "resource://testing-common/httpd.sys.mjs"
+);
+
+add_task(async function test_favicon() {
+  await SpecialPowers.pushPrefEnv({
+    set: [["browser.chrome.guess_favicon", true]],
+  });
+
+  const httpServer = new HttpServer();
+
+  httpServer.registerPathHandler("/", (_, response) => {
+    response.setHeader("Content-Type", "application/json");
+    response.write("{}");
+  });
+
+  const faviconPromise = new Promise(resolve => {
+    httpServer.registerPathHandler("/favicon.ico", () => {
+      resolve();
+    });
+  });
+
+  httpServer.start(-1);
+
+  const tab = await BrowserTestUtils.openNewForegroundTab({
+    gBrowser,
+    url: `http://localhost:${httpServer.identity.primaryPort}/`,
+  });
+
+  info("Waiting for favicon request to be received by server");
+  await faviconPromise;
+  ok("Server got request for favicon");
+
+  BrowserTestUtils.removeTab(tab);
+
+  httpServer.stop();
+});