create a provider stub

test/stub/provider.js

@@ -0,0 +1,25 @@
+const JsonRpcEngine = require('json-rpc-engine')
+const scaffoldMiddleware = require('eth-json-rpc-middleware/scaffold')
+
+module.exports = {
+  createEngineForTestData,
+  providerFromEngine,
+  scaffoldMiddleware,
+  createStubedProvider
+}
+
+
+function createEngineForTestData () {
+  return new JsonRpcEngine()
+}
+
+function providerFromEngine (engine) {
+  const provider = { sendAsync: engine.handle.bind(engine) }
+  return provider
+}
+
+function createStubedProvider (resultStub) {
+  const engine = createEngineForTestData()
+  engine.push(scaffoldMiddleware(resultStub))
+  return providerFromEngine(engine)
+}