Include area in initiatives export

[oliverbarnes]

🎩 What? Why?

Includes an initiative's area name to the serialized Initiative fields, to be included when exporting initiatives from the admin.

Also adds overall test coverage to the initiative serializer.

📌 Related Issues

Metadecidim issue: https://meta.decidim.org/processes/roadmap/f/122/proposals/16199

Testing

1. Go to https://decidim-staging.liquidvoting.io/ and log-in as admin@example.org / decidim123456

2. Then go to https://decidim-staging.liquidvoting.io/admin/initiatives and click on "Export", then "Initiatives as CSV":

You should see a confirmation message saying the email with the export was sent:

You can view the email and download the exported zip at: https://decidim-staging.liquidvoting.io/letter_opener

And a sample exported zip file here: https://decidim-staging.liquidvoting.io/letter_opener/1611949506_9309008_b5bc353/attachments/initiatives-2021-01-29-71106.zip

📋 Checklist

🚨 Please review the guidelines for contributing to this repository.

• ❓ CONSIDER adding a unit test if your PR resolves an issue.
• ✔️ DO check open PR's to avoid duplicates.
• ✔️ DO keep pull requests small so they can be easily reviewed.
• ✔️ DO build locally before pushing.
• ✔️ DO make sure tests pass.
• ✔️ DO make sure any new changes are documented in docs/.
• ✔️ DO add and modify seeds if necessary.
• ✔️ DO add CHANGELOG upgrade notes if required.
• ✔️ DO add to GraphQL API if there are new public fields.
• ✔️ DO add link to MetaDecidim if it's a new feature.
• ❌AVOID breaking the continuous integration build.
• ❌AVOID making significant changes to the overall architecture.

📷 Screenshots

Nothing changes visually, but here's a screenshot of where to test this:

[mrcasals]

Thanks for including so many tests! ❤️

[oliverbarnes]

pleasure! :)