diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 58bbf8c80a78..90e53e45500e 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -1594,6 +1594,7 @@ in
   tzupdate = runTest ./tzupdate.nix;
   ucarp = runTest ./ucarp.nix;
   udisks2 = runTest ./udisks2.nix;
+  udp-over-tcp = runTest ./udp-over-tcp.nix;
   ulogd = runTest ./ulogd/ulogd.nix;
   umami = runTest ./web-apps/umami.nix;
   umurmur = runTest ./umurmur.nix;
diff --git a/nixos/tests/udp-over-tcp.nix b/nixos/tests/udp-over-tcp.nix
new file mode 100644
index 000000000000..2f53cffeae86
--- /dev/null
+++ b/nixos/tests/udp-over-tcp.nix
@@ -0,0 +1,61 @@
+{ lib, ... }:
+{
+  name = "udp-over-tcp";
+  meta.maintainers = [ lib.maintainers.timschumi ];
+
+  nodes.sender =
+    { nodes, ... }:
+    {
+      services.udp-over-tcp = {
+        udp2tcp = {
+          "0.0.0.0:51821" = {
+            forward = "${nodes.receiver.networking.primaryIPAddress}:444";
+            openFirewall = true;
+
+            # Remaining options are not tested for behavior, but to cover options passing.
+            recvBufferSize = 16384;
+            sendBufferSize = 16384;
+            recvTimeout = 10;
+            fwmark = 1337;
+            nodelay = true;
+          };
+        };
+      };
+    };
+
+  nodes.receiver =
+    { nodes, ... }:
+    {
+      services.udp-over-tcp = {
+        tcp2udp = {
+          "0.0.0.0:444" = {
+            forward = "127.0.0.1:51821";
+            openFirewall = true;
+
+            # Remaining options are not tested for behavior, but to cover options passing.
+            threads = 2;
+            bind = "127.0.0.1";
+            recvBufferSize = 16384;
+            sendBufferSize = 16384;
+            recvTimeout = 10;
+            fwmark = 1337;
+            nodelay = true;
+          };
+        };
+      };
+    };
+
+  testScript = ''
+    start_all()
+
+    # TODO: Replace unit wait with waiting on an UDP port.
+    sender.wait_for_unit("udp2tcp-0.0.0.0:51821.service")
+    receiver.wait_for_open_port(444, "0.0.0.0")
+
+    receiver.succeed("nc -w 10 -u -l 127.0.0.1 51821 > transfer.txt &")
+    # We need to delay a short time here because detaching exits the shell before the socket is ready.
+    receiver.execute("sleep 1")
+    sender.succeed("echo 'Hello World!' | nc -w 1 -u 127.0.0.1 51821")
+    receiver.succeed("grep 'Hello World!' transfer.txt")
+  '';
+}
diff --git a/pkgs/by-name/ud/udp-over-tcp/package.nix b/pkgs/by-name/ud/udp-over-tcp/package.nix
index ce713befb818..3f16a146ae84 100644
--- a/pkgs/by-name/ud/udp-over-tcp/package.nix
+++ b/pkgs/by-name/ud/udp-over-tcp/package.nix
@@ -1,6 +1,7 @@
 {
   fetchFromGitHub,
   lib,
+  nixosTests,
   rustPlatform,
 }:
 rustPlatform.buildRustPackage (finalAttrs: {
@@ -21,6 +22,10 @@ rustPlatform.buildRustPackage (finalAttrs: {
     "clap"
   ];
 
+  passthru.tests = {
+    inherit (nixosTests) udp-over-tcp;
+  };
+
   meta = {
     homepage = "https://github.com/mullvad/udp-over-tcp";
     description = "Proxy UDP traffic over a TCP stream";