diff --git a/kafkaex_lag_exporter.iml b/kafkaex_lag_exporter.iml
index f89ef49..e94efba 100644
--- a/kafkaex_lag_exporter.iml
+++ b/kafkaex_lag_exporter.iml
@@ -88,6 +88,8 @@
       <excludeFolder url="file://$MODULE_DIR$/_build/test/lib/octo_fetch" />
       <excludeFolder url="file://$MODULE_DIR$/_build/test/lib/phoenix_template" />
       <excludeFolder url="file://$MODULE_DIR$/_build/dev/lib/ssl_verify_fun" />
+      <excludeFolder url="file://$MODULE_DIR$/_build/test/lib/mox" />
+      <excludeFolder url="file://$MODULE_DIR$/_build/test/lib/ssl_verify_fun" />
     </content>
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" name="credo" level="project" />
@@ -167,4 +169,4 @@
     <orderEntry type="library" name="nimble_parsec" level="project" />
     <orderEntry type="library" name="ssl_verify_fun" level="project" />
   </component>
-</module>
+</module>
\ No newline at end of file
diff --git a/mix.exs b/mix.exs
index e7cc148..65a951e 100644
--- a/mix.exs
+++ b/mix.exs
@@ -39,7 +39,8 @@ defmodule KafkaexLagExporter.MixProject do
       {:plug_cowboy, "~> 2.6.1"},
       {:credo, "~> 1.7.5", only: [:dev, :test], runtime: false},
       {:dialyxir, "~> 1.0", only: [:dev], runtime: false},
-      {:brod, "~> 3.17.0" },
+      {:mox, "~> 1.1", only: :test},
+      {:brod, "~> 3.17.0"},
       {:prom_ex, "~> 1.8.0"},
       {:telemetry, "~> 1.2"}
     ]
diff --git a/mix.lock b/mix.lock
index bcbb1d2..0a5088f 100644
--- a/mix.lock
+++ b/mix.lock
@@ -16,6 +16,7 @@
   "kafka_protocol": {:hex, :kafka_protocol, "4.1.5", "d15e64994a8ca99716ab47db4132614359ac1bfa56d6c5b4341fdc1aa4041518", [:rebar3], [{:crc32cer, "0.1.8", [hex: :crc32cer, repo: "hexpm", optional: false]}], "hexpm", "c956c9357fef493b7072a35d0c3e2be02aa5186c804a412d29e62423bb15e5d9"},
   "mime": {:hex, :mime, "2.0.5", "dc34c8efd439abe6ae0343edbb8556f4d63f178594894720607772a041b04b02", [:mix], [], "hexpm", "da0d64a365c45bc9935cc5c8a7fc5e49a0e0f9932a761c55d6c52b142780a05c"},
   "mint": {:hex, :mint, "1.5.2", "4805e059f96028948870d23d7783613b7e6b0e2fb4e98d720383852a760067fd", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "d77d9e9ce4eb35941907f1d3df38d8f750c357865353e21d335bdcdf6d892a02"},
+  "mox": {:hex, :mox, "1.1.0", "0f5e399649ce9ab7602f72e718305c0f9cdc351190f72844599545e4996af73c", [:mix], [], "hexpm", "d44474c50be02d5b72131070281a5d3895c0e7a95c780e90bc0cfe712f633a13"},
   "nimble_options": {:hex, :nimble_options, "1.1.0", "3b31a57ede9cb1502071fade751ab0c7b8dbe75a9a4c2b5bbb0943a690b63172", [:mix], [], "hexpm", "8bbbb3941af3ca9acc7835f5655ea062111c9c27bcac53e004460dfd19008a99"},
   "nimble_pool": {:hex, :nimble_pool, "1.0.0", "5eb82705d138f4dd4423f69ceb19ac667b3b492ae570c9f5c900bb3d2f50a847", [:mix], [], "hexpm", "80be3b882d2d351882256087078e1b1952a28bf98d0a287be87e4a24a710b67a"},
   "octo_fetch": {:hex, :octo_fetch, "0.4.0", "074b5ecbc08be10b05b27e9db08bc20a3060142769436242702931c418695b19", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~> 1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm", "cf8be6f40cd519d7000bb4e84adcf661c32e59369ca2827c4e20042eda7a7fc6"},