Test case for haskell#4986

Signed-off-by: Edward Z. Yang <[email protected]>

Author: ezyang

cabal-testsuite/PackageTests/Regression/T4986/cabal.project

@@ -0,0 +1 @@
+packages: client, happy

cabal-testsuite/PackageTests/Regression/T4986/cabal.test.hs

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+import Test.Cabal.Prelude
+main = cabalTest $ do
+    cabal "new-configure" []

cabal-testsuite/PackageTests/Regression/T4986/client/Hello.hs

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+main = return ()

cabal-testsuite/PackageTests/Regression/T4986/client/client.cabal

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+name:                client
+version:             0.1.0.0
+synopsis:            Checks build-tools are put in PATH
+license:             BSD3
+category:            Testing
+build-type:          Simple
+cabal-version:       >=1.10
+
+executable             hello-world
+  main-is:             Hello.hs
+  build-depends:       base
+  build-tools:         happy
+  build-tool-depends:  happy:happy
+  default-language:    Haskell2010

cabal-testsuite/PackageTests/Regression/T4986/happy/Main.hs

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+main = return ()

cabal-testsuite/PackageTests/Regression/T4986/happy/happy.cabal

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+name:                happy
+version:             999.999.999
+synopsis:            Checks double-dependency on build-tool works correctly
+license:             BSD3
+category:            Testing
+build-type:          Simple
+cabal-version:       >=1.10
+
+executable             happy
+  main-is:             Main.hs
+  build-depends:       base
+  default-language:    Haskell2010