Can mirage be used for testing?

[RobbieTheWagner]

I'm using the ember-data adapters from this addon, and I would like to write tests now. I setup some mirage fixtures, and loaded them, and it seems that the data is not loaded in. I am guessing because of the magic of the adapters. Is there any way to use this with mirage?

[RobbieTheWagner]

It seems like something like this works:

import DS from 'ember-data';
import EmberLocalStorageAdapter from 'ember-local-storage/adapters/local';
import ENV from 'swach/config/environment';

let Adapter = EmberLocalStorageAdapter;

if (ENV.environment === 'test') {
  Adapter = DS.JSONAPIAdapter;
}

export default Adapter;

We should decide how we want to best support Mirage and document it.

[fsmanuel]

Hey @rwwagner90,
interesting question. I never tried to run mirage with ELS. As far as I understand, the goal of mirage is to mock your server. As ELS never talks to the server it’s kind of confusing to use mirage. But I get your point that testing has no story, yet.

A comment about your approach from above: That would just test the JSONAPIAdapter which is not too different to ELS Adapter but not the same thing.

I’ll need to think about it more but here is a quick suggestion. You can create some records in your app and use the export feature to export it to a JSON file. Then in your tests you can import that file and use it as fixtures.

[RobbieTheWagner]

@fsmanuel I have it working with Mirage currently. I would love if we could get a more official Mirage solution in place though.

[RobbieTheWagner]

@fsmanuel have you given this any more thought? We're hitting some issues now where running the tests against a mirage setup that doesn't use ELS is causing issues.

[fsmanuel]

Hey @rwwagner90, as I said I don't think we can use Mirage for the tests as ELS never issues a network request that Mirage can intercept. What you are doing is testing JSONAPIAdapter.

Are you on Discord? You can ping me there (fsmanuel) so we can talk about it.

[fsmanuel]

As discussed on Discord, the idea is to use mirage db to populate LocalStorage.

[fsmanuel]

Hey @samselikoff, do you have any input on that?

[samselikoff]

Not really familiar with this addon – does it store network / ember-data payloads into localStorage?

You can call server.db.dump() to dump out Mirage's database, and server.db.loadData(data) to load it back in. Folks have used that before to make Mirage "persist" after a page reload.

[fsmanuel]

@samselikoff thanks for the info and the pointer to dump. Yes, the addon stores JSON API payloads into localStorage.

[fsmanuel]

@samselikoff looks like we could use this helper: https://www.ember-cli-mirage.com/docs/testing/integration-and-unit-tests#writing-a-helper-to-push-mirage-s-database