Add integration test

haskell-stack-trace-plugin.cabal

@@ -44,6 +44,28 @@ library
     ghc-options:      -O2 -Wall
   default-language:   Haskell2010
 
+test-suite test
+  main-is:            Spec.hs
+  hs-source-dirs:     test
+  type:               exitcode-stdio-1.0
+  build-depends:
+    base >=4.12 && <4.13,
+    bytestring >= 0.10.8 && <0.11,
+    hspec >= 2.7 && <2.8,
+    typed-process >= 0.2.6 && <0.2.9
+
+  build-tool-depends:
+    hspec-discover:hspec-discover >= 2.7 && <2.8
+
+  other-modules: StackTrace.PluginSpec
+
+  if flag(dev)
+    ghc-options:      -Wall -Werror
+  else
+    ghc-options:      -O2 -Wall
+
+  default-language:   Haskell2010
+
 executable example
   main-is: Main.hs
   hs-source-dirs: example

test/Spec.hs

@@ -0,0 +1 @@
+{-# OPTIONS_GHC -F -pgmF hspec-discover #-}

test/StackTrace/PluginSpec.hs

@@ -0,0 +1,21 @@
+{-# LANGUAGE OverloadedStrings #-}
+module StackTrace.PluginSpec (spec) where
+
+import Data.ByteString.Lazy (ByteString)
+import qualified Data.ByteString.Lazy as BL
+import Test.Hspec
+import System.Process.Typed
+
+spec :: Spec
+spec = do
+  output <- runIO exe
+  expected <- runIO $ BL.readFile "test/resource/ghc86.output"
+  it "integration test" $ output `shouldBe` expected
+
+
+exe :: IO ByteString
+exe = do
+  runProcess_ $ shell "cabal install exe:example --installdir=./dist"
+  err <- readProcessStderr_ $ shell "./dist/example || true"
+  runProcess_ $ shell "rm -rf ./dist"
+  return err

test/resource/ghc86.output

@@ -0,0 +1,13 @@
+example: fError
+CallStack (from HasCallStack):
+  error, called at example/Main.hs:41:10 in main:Main
+  fError, called at example/Main.hs:37:11 in main:Main
+  f8, called at example/Main.hs:33:16 in main:Main
+  f7, called at example/Main.hs:29:11 in main:Main
+  f6, called at example/Main.hs:25:15 in main:Main
+  f5, called at example/Main.hs:21:8 in main:Main
+  f4, called at example/Main.hs:17:6 in main:Main
+  f3, called at example/Main.hs:13:6 in main:Main
+  f2, called at example/Main.hs:10:6 in main:Main
+  f1, called at example/Main.hs:7:14 in main:Main
+  main, called at example/Main.hs:7:1 in main:Main