Not-yet-added empty test suite

vervis.cabal

@@ -337,5 +337,17 @@ test-suite test
                      , aeson
   hs-source-dirs:      test
   default-language:    Haskell2010
-  ghc-options:       -Wall
+  ghc-options:         -Wall
-  type:              exitcode-stdio-1.0
+  type:                exitcode-stdio-1.0
+
+-- test-suite test-graph
+--   main-is:             Test.hs
+--   build-depends:       base
+--                      , fgl
+--                      , fgl-arbitrary
+--                      , hspec
+--                      , vervis
+--   hs-source-dirs:      test
+--   default-language:    Haskell2010
+--   ghc-options:         -Wall
+--   type:                exitcode-stdio-1.0