$ gulp test
gulp[77879]: ../src/node_contextify.cc:627:static void node::contextify::ContextifyScript::New(const FunctionCallbackInfo<v8::Value> &): Assertion `args[1]->IsString()' failed.
1: 0x100039393 node::Abort() [/usr/local/bin/node]
2: 0x10003849d node::MakeCallback(v8::Isolate*, v8::Local<v8::Object>, char const*, int, v8::Local<v8::Value>*, node::async_context) [/usr/local/bin/node]
3: 0x10005e5fc node::contextify::ContextifyScript::New(v8::FunctionCallbackInfo<v8::Value> const&) [/usr/local/bin/node]
4: 0x1001fd3e7 v8::internal::FunctionCallbackArguments::Call(v8::internal::CallHandlerInfo*) [/usr/local/bin/node]
5: 0x1001fc704 v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<true>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) [/usr/local/bin/node]
6: 0x1001fc141 v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) [/usr/local/bin/node]
7: 0x96e1695c01d
8: 0x96e1690d145
9: 0x96e1698b900
10: 0x96e169118b5
11: 0x96e169118b5
Abort trap: 6