1 files changed, 67 insertions, 0 deletions
diff --git a/devtools/client/jsonview/test/browser_jsonview_encoding.js b/devtools/client/jsonview/test/browser_jsonview_encoding.js
new file mode 100644
index 0000000000..be49af39d2
--- /dev/null
+++ b/devtools/client/jsonview/test/browser_jsonview_encoding.js
@@ -0,0 +1,67 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+add_task(async function () {
+  info("Test JSON encoding started");
+
+  const bom = "%EF%BB%BF"; // UTF-8 BOM
+  const tests = [
+    {
+      input: bom,
+      output: "",
+    },
+    {
+      input: "%FE%FF", // UTF-16BE BOM
+      output: "\uFFFD\uFFFD",
+    },
+    {
+      input: "%FF%FE", // UTF-16LE BOM
+      output: "\uFFFD\uFFFD",
+    },
+    {
+      input: bom + "%30",
+      output: "0",
+    },
+    {
+      input: bom + bom,
+      output: "\uFEFF",
+    },
+    {
+      input: "%00%61",
+      output: "\u0000a",
+    },
+    {
+      input: "%61%00",
+      output: "a\u0000",
+    },
+    {
+      input: "%30%FF",
+      output: "0�",
+    },
+    {
+      input: "%C3%A0",
+      output: "à",
+    },
+    {
+      input: "%E2%9D%A4",
+      output: "❤",
+    },
+    {
+      input: "%F0%9F%9A%80",
+      output: "🚀",
+    },
+  ];
+
+  for (const { input, output } of tests) {
+    info("Test decoding of " + JSON.stringify(input) + ".");
+
+    await addJsonViewTab("data:application/json," + input);
+    await selectJsonViewContentTab("rawdata");
+
+    // Check displayed data.
+    const data = await getElementText(".textPanelBox .data");
+    is(data, output, "The right data has been received.");
+  }
+});