Add a test suite and treefmt

hell.cabal

@@ -26,6 +26,43 @@ executable hell
     , bytestring
     , constraints
     , containers
+    , criterion
+    , criterion-measurement
+    , directory
+    , ghc-prim
+    , haskell-src-exts
+    , hspec
+    , lucid2
+    , mtl
+    , optparse-applicative
+    , syb
+    , template-haskell
+    , temporary
+    , text
+    , th-lift
+    , th-orphans
+    , these
+    , time
+    , typed-process
+    , unliftio
+    , vector
+  default-language: Haskell2010
+
+test-suite hell-test
+  type: exitcode-stdio-1.0
+  main-is: src/Hell.hs
+  other-modules:
+      Paths_hell
+  ghc-options: -Wall -Wno-missing-pattern-synonym-signatures -O2 -main-is Main.specMain -threaded -rtsopts
+  build-depends:
+      QuickCheck
+    , aeson
+    , async
+    , base
+    , bytestring
+    , constraints
+    , containers
+    , criterion
     , criterion-measurement
     , directory
     , ghc-prim

package.yaml

@@ -13,6 +13,7 @@ dependencies:
 - bytestring
 - async
 - criterion-measurement
+- criterion
 - mtl
 - directory
 - syb
@@ -43,3 +44,12 @@ executables:
     ghc-options:
       - -threaded
       - -rtsopts
+
+tests:
+  hell-test:
+    main: src/Hell.hs
+    ghc-options:
+      - -main-is
+      - Main.specMain
+      - -threaded
+      - -rtsopts