1 files changed, 48 insertions, 0 deletions
diff --git a/netwerk/test/unit/test_port_remapping.js b/netwerk/test/unit/test_port_remapping.js
new file mode 100644
index 0000000000..537d8d6f46
--- /dev/null
+++ b/netwerk/test/unit/test_port_remapping.js
@@ -0,0 +1,48 @@
+// This test is checking the `network.socket.forcePort` preference has an effect.
+// We remap an ilusional port `8765` to go to the port the server actually binds to.
+
+"use strict";
+
+const { HttpServer } = ChromeUtils.import("resource://testing-common/httpd.js");
+
+function make_channel(url, callback, ctx) {
+  return NetUtil.newChannel({ uri: url, loadUsingSystemPrincipal: true });
+}
+
+const REMAPPED_PORT = 8765;
+
+add_task(async function check_protocols() {
+  function contentHandler(metadata, response) {
+    let responseBody = "The server should never return this!";
+    response.setHeader("Content-Type", "text/plain");
+    response.bodyOutputStream.write(responseBody, responseBody.length);
+  }
+
+  const httpserv = new HttpServer();
+  httpserv.registerPathHandler("/content", contentHandler);
+  httpserv.start(-1);
+
+  do_get_profile();
+  Services.prefs.setCharPref(
+    "network.socket.forcePort",
+    `${REMAPPED_PORT}=${httpserv.identity.primaryPort}`
+  );
+
+  function get_response() {
+    return new Promise(resolve => {
+      const URL = `http://localhost:${REMAPPED_PORT}/content`;
+      const channel = make_channel(URL);
+      channel.asyncOpen(
+        new ChannelListener((request, data) => {
+          resolve(data);
+        })
+      );
+    });
+  }
+
+  // We expect "Bad request" from the test server because the server doesn't
+  // have identity for the remapped port. We don't want to add it too, because
+  // that would not prove we actualy remap the port number.
+  Assert.equal(await get_response(), "Bad request\n");
+  await new Promise(resolve => httpserv.stop(resolve));
+});