diff --git a/pkgs/development/python-modules/mitmproxy/default.nix b/pkgs/development/python-modules/mitmproxy/default.nix
index f0ce75afc207..78cc884abc32 100644
--- a/pkgs/development/python-modules/mitmproxy/default.nix
+++ b/pkgs/development/python-modules/mitmproxy/default.nix
@@ -18,6 +18,7 @@
   ldap3,
   mitmproxy-rs,
   msgpack,
+  nixosTests,
   publicsuffix2,
   pyopenssl,
   pyparsing,
@@ -50,6 +51,7 @@ buildPythonPackage rec {
 
   pythonRelaxDeps = [
     "bcrypt"
+    "brotli"
     "cryptography"
     "flask"
     "h2"
@@ -146,6 +148,10 @@ buildPythonPackage rec {
 
   pythonImportsCheck = [ "mitmproxy" ];
 
+  passthru.tests = {
+    inherit (nixosTests) mitmproxy;
+  };
+
   meta = with lib; {
     description = "Man-in-the-middle proxy";
     homepage = "https://mitmproxy.org/";