1 files changed, 36 insertions, 0 deletions
diff --git a/netwerk/test/unit/test_addr_in_use_error.js b/netwerk/test/unit/test_addr_in_use_error.js
new file mode 100644
index 0000000000..d25860e896
--- /dev/null
+++ b/netwerk/test/unit/test_addr_in_use_error.js
@@ -0,0 +1,36 @@
+// Opening a second listening socket on the same address as an extant
+// socket should elicit NS_ERROR_SOCKET_ADDRESS_IN_USE on non-Windows
+// machines.
+
+"use strict";
+
+var CC = Components.Constructor;
+
+const ServerSocket = CC(
+  "@mozilla.org/network/server-socket;1",
+  "nsIServerSocket",
+  "init"
+);
+
+function testAddrInUse() {
+  // Windows lets us have as many sockets listening on the same address as
+  // we like, evidently.
+  if (mozinfo.os == "win") {
+    return;
+  }
+
+  // Create listening socket:
+  // any port (-1), loopback only (true), default backlog (-1)
+  let listener = ServerSocket(-1, true, -1);
+  Assert.ok(listener instanceof Ci.nsIServerSocket);
+
+  // Try to create another listening socket on the same port, whatever that was.
+  do_check_throws_nsIException(
+    () => ServerSocket(listener.port, true, -1),
+    "NS_ERROR_SOCKET_ADDRESS_IN_USE"
+  );
+}
+
+function run_test() {
+  testAddrInUse();
+}