diff --git a/manifest.dhall b/manifest.dhall
index 6f2907ae81317abff768f5d0b9605f79353aaebe..a6555de5198ee6abaf7162d2f081dca1ea87d145 100644
--- a/manifest.dhall
+++ b/manifest.dhall
@@ -322,6 +322,7 @@ in  [ callHackage "Cabal" "3.8.1.0"
     , callHackage "lucid" "2.11.1"
     , callHackage "net-mqtt" "0.8.2.2"
     , callHackage "memory" "0.18.0"
+    , callHackage "mockery" "0.3.5"
     , callHackage "microstache" "1.0.2.2"
     , callHackage "monad-control" "1.0.3.1"
     , callHackage "monad-time" "0.4.0.0"
diff --git a/overlay.nix b/overlay.nix
index 2d573eff195f033eb1c1d9cac8d0a49b6ba73a2c..4829006ac5fb25ac83747843e898c253a0746d72 100644
--- a/overlay.nix
+++ b/overlay.nix
@@ -375,6 +375,8 @@ final: prev: with pkgs.haskell.lib; {
 
   microstache = prev.callPackage (./pkgs/microstache.nix) { };
 
+  mockery = prev.callPackage (./pkgs/mockery.nix) { };
+
   monad-control = prev.callPackage (./pkgs/monad-control.nix) { };
 
   monad-par = prev.callPackage (./pkgs/monad-par.nix) { };
diff --git a/pkgs/mockery.nix b/pkgs/mockery.nix
new file mode 100644
index 0000000000000000000000000000000000000000..2501696a7f6d2e002dbc12db1e7096c0e4b36164
--- /dev/null
+++ b/pkgs/mockery.nix
@@ -0,0 +1,48 @@
+{ mkDerivation
+, base
+, base-compat
+, bytestring
+, directory
+, filepath
+, hspec
+, lib
+, logging-facade
+, temporary
+}:
+mkDerivation {
+  pname = "mockery";
+  version = "0.3.5";
+  sha256 = "b7a1edacd3d32dc7f0e28c67877209d3ca3551d1da186f6445f825f3477dd727";
+  isLibrary = true;
+  isExecutable = false;
+  enableSeparateDataOutput = false;
+  libraryHaskellDepends = [
+    base
+    base-compat
+    bytestring
+    directory
+    filepath
+    logging-facade
+    temporary
+  ];
+  testHaskellDepends = [
+    base
+    base-compat
+    bytestring
+    directory
+    filepath
+    hspec
+    logging-facade
+    temporary
+  ];
+  enableLibraryProfiling = false;
+  enableExecutableProfiling = false;
+  doHaddock = false;
+  jailbreak = true;
+  doCheck = false;
+  doBenchmark = false;
+  hyperlinkSource = false;
+  description = "Support functions for automated testing";
+  license = lib.licenses.mit;
+  broken = false;
+}