hackport-0.5.5: cabal/cabal-testsuite/PackageTests/Sandbox/MultipleSources/cabal.test.hs

import Test.Cabal.Prelude
main = cabalTest $ do
    withSandbox $ do
        cabal_sandbox "add-source" ["p"]
        cabal_sandbox "add-source" ["q"]
        cabal "install" ["q"]