1 files changed, 82 insertions, 0 deletions
diff --git a/devtools/shared/tests/xpcshell/test_fetch-bom.js b/devtools/shared/tests/xpcshell/test_fetch-bom.js
new file mode 100644
index 0000000000..566133fda6
--- /dev/null
+++ b/devtools/shared/tests/xpcshell/test_fetch-bom.js
@@ -0,0 +1,82 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+"use strict";
+
+// Tests for DevToolsUtils.fetch BOM detection.
+
+const { HttpServer } = ChromeUtils.importESModule(
+  "resource://testing-common/httpd.sys.mjs"
+);
+const BinaryOutputStream = Components.Constructor(
+  "@mozilla.org/binaryoutputstream;1",
+  "nsIBinaryOutputStream",
+  "setOutputStream"
+);
+
+function write8(bos) {
+  bos.write8(0xef);
+  bos.write8(0xbb);
+  bos.write8(0xbf);
+  bos.write8(0x68);
+  bos.write8(0xc4);
+  bos.write8(0xb1);
+}
+
+function write16be(bos) {
+  bos.write8(0xfe);
+  bos.write8(0xff);
+  bos.write8(0x00);
+  bos.write8(0x68);
+  bos.write8(0x01);
+  bos.write8(0x31);
+}
+
+function write16le(bos) {
+  bos.write8(0xff);
+  bos.write8(0xfe);
+  bos.write8(0x68);
+  bos.write8(0x00);
+  bos.write8(0x31);
+  bos.write8(0x01);
+}
+
+function getHandler(writer) {
+  return function (request, response) {
+    response.setStatusLine(request.httpVersion, 200, "OK");
+
+    const bos = new BinaryOutputStream(response.bodyOutputStream);
+    writer(bos);
+  };
+}
+
+const server = new HttpServer();
+server.registerDirectory("/", do_get_cwd());
+server.registerPathHandler("/u8", getHandler(write8));
+server.registerPathHandler("/u16be", getHandler(write16be));
+server.registerPathHandler("/u16le", getHandler(write16le));
+server.start(-1);
+
+const port = server.identity.primaryPort;
+const serverURL = "http://localhost:" + port;
+
+do_get_profile();
+
+registerCleanupFunction(() => {
+  return new Promise(resolve => server.stop(resolve));
+});
+
+add_task(async function () {
+  await test_one(serverURL + "/u8", "UTF-8");
+  await test_one(serverURL + "/u16be", "UTF-16BE");
+  await test_one(serverURL + "/u16le", "UTF-16LE");
+});
+
+async function test_one(url, encoding) {
+  // Be sure to set the encoding to something that will yield an
+  // invalid result if BOM sniffing is not done.
+  await DevToolsUtils.fetch(url, { charset: "ISO-8859-1" }).then(
+    ({ content }) => {
+      Assert.equal(content, "hı", "The content looks correct for " + encoding);
+    }
+  );
+}