diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 579f89e03d2c..a74814158f1b 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -259,6 +259,7 @@ in
   miniflux = handleTest ./miniflux.nix {};
   minio = handleTest ./minio.nix {};
   misc = handleTest ./misc.nix {};
+  mjolnir = handleTest ./matrix/mjolnir.nix {};
   mod_perl = handleTest ./mod_perl.nix {};
   moinmoin = handleTest ./moinmoin.nix {};
   mongodb = handleTest ./mongodb.nix {};
diff --git a/nixos/tests/matrix/mjolnir.nix b/nixos/tests/matrix/mjolnir.nix
new file mode 100644
index 000000000000..bb55f6f5440b
--- /dev/null
+++ b/nixos/tests/matrix/mjolnir.nix
@@ -0,0 +1,165 @@
+import ../make-test-python.nix (
+  { pkgs, ... }:
+  let
+    # Set up SSL certs for Synapse to be happy.
+    runWithOpenSSL = file: cmd: pkgs.runCommand file
+      {
+        buildInputs = [ pkgs.openssl ];
+      }
+      cmd;
+
+    ca_key = runWithOpenSSL "ca-key.pem" "openssl genrsa -out $out 2048";
+    ca_pem = runWithOpenSSL "ca.pem" ''
+      openssl req \
+        -x509 -new -nodes -key ${ca_key} \
+        -days 10000 -out $out -subj "/CN=snakeoil-ca"
+    '';
+    key = runWithOpenSSL "matrix_key.pem" "openssl genrsa -out $out 2048";
+    csr = runWithOpenSSL "matrix.csr" ''
+      openssl req \
+         -new -key ${key} \
+         -out $out -subj "/CN=localhost" \
+    '';
+    cert = runWithOpenSSL "matrix_cert.pem" ''
+      openssl x509 \
+        -req -in ${csr} \
+        -CA ${ca_pem} -CAkey ${ca_key} \
+        -CAcreateserial -out $out \
+        -days 365
+    '';
+  in
+  {
+    name = "mjolnir";
+    meta = with pkgs.lib; {
+      maintainers = teams.matrix.members;
+    };
+
+    nodes = {
+      homeserver = { pkgs, ... }: {
+        services.matrix-synapse = {
+          enable = true;
+          database_type = "sqlite3";
+          tls_certificate_path = "${cert}";
+          tls_private_key_path = "${key}";
+          enable_registration = true;
+          registration_shared_secret = "supersecret-registration";
+
+          listeners = [
+            # The default but tls=false
+            {
+              "bind_address" = "";
+              "port" = 8448;
+              "resources" = [
+                { "compress" = true; "names" = [ "client" "webclient" ]; }
+                { "compress" = false; "names" = [ "federation" ]; }
+              ];
+              "tls" = false;
+              "type" = "http";
+              "x_forwarded" = false;
+            }
+          ];
+        };
+
+        networking.firewall.allowedTCPPorts = [ 8448 ];
+
+        environment.systemPackages = [
+          (pkgs.writeShellScriptBin "register_mjolnir_user" ''
+            exec ${pkgs.matrix-synapse}/bin/register_new_matrix_user \
+              -u mjolnir \
+              -p mjolnir-password \
+              --admin \
+              --shared-secret supersecret-registration \
+              http://localhost:8448
+          ''
+          )
+          (pkgs.writeShellScriptBin "register_moderator_user" ''
+            exec ${pkgs.matrix-synapse}/bin/register_new_matrix_user \
+              -u moderator \
+              -p moderator-password \
+              --no-admin \
+              --shared-secret supersecret-registration \
+              http://localhost:8448
+          ''
+          )
+        ];
+      };
+
+      mjolnir = { pkgs, ... }: {
+        services.mjolnir = {
+          enable = true;
+          homeserverUrl = "http://homeserver:8448";
+          pantalaimon = {
+            enable = true;
+            username = "mjolnir";
+            passwordFile = pkgs.writeText "password.txt" "mjolnir-password";
+          };
+          managementRoom = "#moderators:homeserver";
+        };
+      };
+
+      client = { pkgs, ... }: {
+        environment.systemPackages = [
+          (pkgs.writers.writePython3Bin "create_management_room_and_invite_mjolnir"
+            { libraries = [ pkgs.python3Packages.matrix-nio ]; } ''
+            import asyncio
+
+            from nio import (
+                AsyncClient,
+                EnableEncryptionBuilder
+            )
+
+
+            async def main() -> None:
+                client = AsyncClient("http://homeserver:8448", "moderator")
+
+                await client.login("moderator-password")
+
+                room = await client.room_create(
+                    name="Moderators",
+                    alias="moderators",
+                    initial_state=[EnableEncryptionBuilder().as_dict()],
+                )
+
+                await client.join(room.room_id)
+                await client.room_invite(room.room_id, "@mjolnir:homeserver")
+
+            asyncio.run(main())
+          ''
+          )
+        ];
+      };
+    };
+
+    testScript = ''
+      with subtest("start homeserver"):
+        homeserver.start()
+
+        homeserver.wait_for_unit("matrix-synapse.service")
+        homeserver.wait_until_succeeds("curl --fail -L http://localhost:8448/")
+
+      with subtest("register users"):
+        # register mjolnir user
+        homeserver.succeed("register_mjolnir_user")
+        # register moderator user
+        homeserver.succeed("register_moderator_user")
+
+      with subtest("start mjolnir"):
+        mjolnir.start()
+
+        # wait for pantalaimon to be ready
+        mjolnir.wait_for_unit("pantalaimon-mjolnir.service")
+        mjolnir.wait_for_unit("mjolnir.service")
+
+        mjolnir.wait_until_succeeds("curl --fail -L http://localhost:8009/")
+
+      with subtest("ensure mjolnir can be invited to the management room"):
+        client.start()
+
+        client.wait_until_succeeds("curl --fail -L http://homeserver:8448/")
+
+        client.succeed("create_management_room_and_invite_mjolnir")
+
+        mjolnir.wait_for_console_text("Startup complete. Now monitoring rooms")
+    '';
+  }
+)
diff --git a/pkgs/servers/mjolnir/default.nix b/pkgs/servers/mjolnir/default.nix
index 9e4bf11937e5..c63e31a5926f 100644
--- a/pkgs/servers/mjolnir/default.nix
+++ b/pkgs/servers/mjolnir/default.nix
@@ -1,4 +1,5 @@
 { lib
+, nixosTests
 , stdenv
 , fetchFromGitHub
 , fetchpatch
@@ -64,7 +65,12 @@ stdenv.mkDerivation rec {
     runHook postInstall
   '';
 
-  passthru.updateScript = ./update.sh;
+  passthru = {
+    tests = {
+      inherit (nixosTests) mjolnir;
+    };
+    updateScript = ./update.sh;
+  };
 
   meta = with lib; {
     description = "A moderation tool for Matrix";