test mongodb and yesod-test

yesod/test/scaffold.sh

@@ -13,6 +13,7 @@ runghc main.hs init
   cabal configure -flibrary-only --disable-optimization
   cabal build
   cabal clean
-  cabal configure
+  cabal configure --enable-tests
   cabal build
+  cabal test
 )

yesod/test/scaffold_test.sh

@@ -3,4 +3,4 @@ teardown() { rm -rf foobar; ghc-pkg unregister foobar &>/dev/null; }
 
 test_sqlite()     { ../test/scaffold.sh < ../test/sqlite-input.txt    ; }
 test_postgresql() { ../test/scaffold.sh < ../test/postgresql-input.txt; }
-#test_mongodb()    { ../test/scaffold.sh < ../test/mongodb-input.txt   ; }
+test_mongodb()    { ../test/scaffold.sh < ../test/mongodb-input.txt   ; }