Add a test for haskell#3199.

cabal-install/cabal-install.cabal

@@ -80,6 +80,11 @@ Extra-Source-Files:
   tests/IntegrationTests/new-build/monitor_cabal_files/q/Setup.hs
   tests/IntegrationTests/new-build/monitor_cabal_files/q/q-broken.cabal.in
   tests/IntegrationTests/new-build/monitor_cabal_files/q/q-fixed.cabal.in
+  tests/IntegrationTests/regression/common.sh
+  tests/IntegrationTests/regression/t3199.sh
+  tests/IntegrationTests/regression/t3199/Main.hs
+  tests/IntegrationTests/regression/t3199/Setup.hs
+  tests/IntegrationTests/regression/t3199/test-3199.cabal
   tests/IntegrationTests/sandbox-sources/common.sh
   tests/IntegrationTests/sandbox-sources/should_fail/fail_removing_source_thats_not_registered.err
   tests/IntegrationTests/sandbox-sources/should_fail/fail_removing_source_thats_not_registered.sh

cabal-install/tests/IntegrationTests/regression/common.sh

@@ -0,0 +1,9 @@
+# Helper to run Cabal
+cabal() {
+    "$CABAL" $CABAL_ARGS "$@"
+}
+
+die() {
+    echo "die: $@"
+    exit 1
+}

cabal-install/tests/IntegrationTests/regression/t3199.sh

@@ -0,0 +1,12 @@
+. ./common.sh
+
+if [[ `ghc --numeric-version` =~ "7\\." ]]; then
+    cd t3199
+    tmpfile=$(mktemp /tmp/cabal-t3199.XXXXXX)
+    cabal sandbox init
+    cabal sandbox add-source ../../../../../Cabal
+    cabal install --package-db=clear --package-db=global --only-dep --dry-run > $tmpfile
+    grep -q "the following would be installed" $tmpfile || die "Should've installed Cabal"
+    grep -q Cabal $tmpfile || die "Should've installed Cabal"
+    rm $tmpfile
+fi

cabal-install/tests/IntegrationTests/regression/t3199/Main.hs

@@ -0,0 +1,4 @@
+module Main where
+
+main :: IO ()
+main = putStrLn "Hello, Haskell!"

cabal-install/tests/IntegrationTests/regression/t3199/Setup.hs

@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain

cabal-install/tests/IntegrationTests/regression/t3199/test-3199.cabal

@@ -0,0 +1,27 @@
+name:                test-t3199
+version:             0.1.0.0
+license:             BSD3
+author:              Mikhail Glushenkov
+maintainer:          [email protected]
+category:            Test
+build-type:          Custom
+cabal-version:       >=1.10
+
+flag exe_2
+     description: Build second exe
+     default:     False
+
+executable test-3199-1
+  main-is:             Main.hs
+  build-depends:       base
+  default-language:    Haskell2010
+
+executable test-3199-2
+  main-is:             Main.hs
+  build-depends:       base, ansi-terminal
+  default-language:    Haskell2010
+
+  if flag(exe_2)
+     buildable: True
+  else
+     buildable: False