See #121 (comment)
Right now we're just running rnws bundle for the example projects on Travis, but we should have tests for:
- getReactNativeExternals.js: make sure it returns the expected modules
- Launch
rnws start (with various combinations of options), fetch each bundle and map file and assert that they match their expected value.
- Run
rnws bundle (with various combinations of options) and assert that the correct bundles are written to their expected file path.