add to doco

[wumpus]

This documentation was in your pull request and should live on in the repo, perhaps in a new file TESTS.md?

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By default, all remote requests are mocked. To change this behaviour and actually call remote APIs (if you run this from a whitelisted IP address), the following environment variable can be set:

export DISABLE_MOCK_RESPONSES=1

If the remote APIs change, new mock data can be semi-automatically collected by setting another environment variable, running corresponding unit tests, and overwriting existin
g mock data in tests/data/mock_responses:

set environment variable (DISABLE_MOCK_RESPONSES should not be set)

export SAVE_MOCK_RESPONSES=./tmp/mock_responses

run the test for what mock data should be saved to $SAVE_MOCK_RESPONSES/<test_file>/<test_func>.jsonl

pytest tests/test_cli.py::test_basics