BaseTestCase::create_mock_wpdb() only adds methods
[prepare, get_var, get_results, insert, query, get_row, update] — the
reaper and amortize_research_costs also call `delete` and `get_col`,
which the default mock can't stub. CI on PR #100 fired all five new
ResearchReaperTest cases as errors at the first `->method('delete')`
call during setUp.
Fix: build a bespoke $wpdb mock in this file's setUp with the full
superset of methods it needs. Self-contained; no change to
BaseTestCase so existing tests aren't affected.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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