Context tests

[ackagel]

Purpose

Adds basic coverage tests for context dependent spatial enrichment analysis

Implementation

Uses existing enrichment testing infrastructure to test for the errorless operation of enrichment functions when provided context arguments.

Remaining issues

Functionality tests should be added in a future PR. Using tools like pytest-cases + fixtures to clean up cell table generation intest_utils.py would really clean up (at a minimum) spatial_analysis_tests.py, and would make adding functionality tests (context dependence, feature distance-hack, etc) much easier.

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[ackagel]

@ngreenwald I decided to just quarantine the context cell-table for its own test, rather than add to the existing complexity of the enriched cell-table generation code.

When functionality tests are added (post-workshop PR?), I think the enriched cell-table generation in test_utils.py should be reworked w/ tools like pytest-cases, i.e made more similar to toffy's tests. It'll be easier to add in context enrichment generation or any future cases, and would also help in the case of potential cell-table format changes (i.e no locally hardcoded column locations+names).

[ngreenwald]

Sounds good, agreed that whole area of the codebase could use some attention with out newfound knowledge