Create some tests

[ageorgou]

Copied from oracc/elastic-search-poc#5:

@raquel-ucl commented:

We can have a few tests that run ingestions and queries in travis:
https://docs.travis-ci.com/user/database-setup/#ElasticSearch

Things we can test (to be expanded):

• Glossary data is broken down correctly from the JSON
• Data is uploaded correctly to ES and is accessible (partly done in Partial search #20)
• The Flask server returns expected results, with the correct headers for CORS.

This may need a little refactoring and/or patching so we can run test uploads/searches on a separate index. I'm not sure whether something like ElasticMock is useful to us, but possibly worth looking at as an alternative.

[ageorgou]

Partly addressed in #12, but some work remains, especially with checking the Flask server's response.

[raquelalegre]

@raquel-ucl is going to do some work on "The Flask server returns expected results, with the correct headers for CORS".

[ageorgou]

Some useful resources:

The pytest-elasticsearch plugin looks like it can help us with a session-scoped Elasticsearch instance, rather than creating and destroying the index for every test, as we do now.

We can test the web server endpoints through the Workzeug test client that Flask exposes (see another example here).