Add integration test

src/core/client/framework/testHelpers/createSinonStub.ts

@@ -0,0 +1,9 @@
+import sinon, { SinonStub } from "sinon";
+
+export default function createSinonStub(
+  ...callbacks: Array<(s: SinonStub) => void>
+): SinonStub {
+  const stub = sinon.stub();
+  callbacks.forEach(cb => cb(stub));
+  return stub;
+}

src/core/client/framework/testHelpers/index.ts

@@ -3,6 +3,7 @@ export {
   CreateRelayEnvironmentParams,
 } from "./createRelayEnvironment";
 export { default as createFluentBundle } from "./createFluentBundle";
+export { default as createSinonStub } from "./createSinonStub";
 export {
   default as removeFragmentRefs,
   NoFragmentRefs,