diff --git a/cabal.project b/cabal.project
index 8461726..2deefb8 100644
--- a/cabal.project
+++ b/cabal.project
@@ -1,8 +1,7 @@
 -- repeating the index-state for hackage to work around hackage.nix parsing limitation
-index-state: 2023-06-06T00:00:00Z
 
 index-state:
-  , hackage.haskell.org 2023-06-06T00:00:00Z
+  , hackage.haskell.org 2023-08-22T11:08:41Z
   , cardano-haskell-packages 2023-06-05T06:39:32Z
 
 packages:
diff --git a/justfile b/justfile
new file mode 100644
index 0000000..666705f
--- /dev/null
+++ b/justfile
@@ -0,0 +1,24 @@
+default:
+    just list
+
+tools:
+    cabal update
+    cabal install fourmolu-0.13.1.0 hlint-3.6.1 apply-refact \
+        --install-method=copy --overwrite-policy=always
+
+format:
+    fourmolu -i lib
+
+lint:
+    hlint lib 
+
+build0:
+    cabal build -v0 -O0 -j fine-types
+
+test:
+    cabal test -v0 -O0 -j unit
+
+repl: 
+    cabal repl -v0 -O0 -j
+
+prepare: format lint build0 test
diff --git a/lib/fine-types/fine-types.cabal b/lib/fine-types/fine-types.cabal
index db37b7e..2299926 100644
--- a/lib/fine-types/fine-types.cabal
+++ b/lib/fine-types/fine-types.cabal
@@ -51,3 +51,16 @@ library
     base >=4.14.3.0
   exposed-modules:
     Language.FineTypes
+
+test-suite unit
+  import:      language, opts-exe
+  type:        exitcode-stdio-1.0
+  hs-source-dirs:
+    test
+  build-tool-depends:
+    hspec-discover:hspec-discover == 2.*
+  build-depends:
+    base
+    , fine-types
+  main-is:
+    Spec.hs
\ No newline at end of file
diff --git a/lib/fine-types/src/Language/FineTypes.hs b/lib/fine-types/src/Language/FineTypes.hs
index 1bc2e6b..9d363af 100644
--- a/lib/fine-types/src/Language/FineTypes.hs
+++ b/lib/fine-types/src/Language/FineTypes.hs
@@ -1 +1 @@
-module Language.FineTypes where
+module Language.FineTypes () where
diff --git a/lib/fine-types/test/Spec.hs b/lib/fine-types/test/Spec.hs
new file mode 100644
index 0000000..c1ddb62
--- /dev/null
+++ b/lib/fine-types/test/Spec.hs
@@ -0,0 +1,4 @@
+import Prelude
+
+main :: IO ()
+main = putStrLn "Test suite not yet implemented"