Gaurav Bajpai fc4d14bce0 test(bdt): unit tests + adversarial fixtures @W-22196528@ ... Adds the full test suite for bdt_analyze.py: 92 unit tests backed by 9 JSON fixtures (4 normative + 5 adversarial). All tests stdlib-only, runnable via `python3 -m unittest tests.test_bdt_analyze`. tests/test_bdt_analyze.py coverage: DAG primitives: - roots() / sinks() / topo_order() on minimal + branching graphs. - upstream() / downstream() reachability correctness. - Cycle tolerance: topo_order + traversals do not infinite-loop or raise when the graph contains a cycle; cycle is reported via broken_references-adjacent signals. - Broken-reference tolerance: nodes referencing non-existent upstreams are handled gracefully; broken_references() enumerates them. CLI subcommands (happy-path + error-path for each): - summary, sources, outputs, stages, nodes, node, lineage, field-trace, formula, definitions — each exercised in both human-readable and --json modes. - Exit-code discipline: unknown node -> exit 2, malformed input -> exit 3, success -> exit 0. - Unknown-action graceful degradation: nodes whose action isn't in the catalog still appear in summary/nodes output with a generic label rather than crashing. - Output size budgets: default-mode outputs are asserted to stay within configured character caps. Field discovery: - fields_produced() / fields_consumed() / _scrape_field_refs() heuristics tested against both clean and noisy formula bodies. - TestFieldTraceFocus — narrowing tests preventing false-positive substring hits in formula text. Dual-shape input: - TestInputShapeDetection — editor export vs. Connect API single-definition auto-detection. - TestMultiDefinition — Connect API multi-definition payload: definitions subcommand, --definition N routing, out-of-range index error handling. Fixtures (tests/fixtures/): - minimal.json — smallest valid editor-export BDT. - window_and_aggregate.json — window + aggregate composition. - api_input_single.json — Connect API single-definition payload. - api_input_multi.json — Connect API multi-definition payload. Adversarial fixtures (tests/fixtures/adversarial/): - cycle.json — graph with a cycle; parser must not hang. - broken_ref.json — node referencing a non-existent upstream. - unknown_action.json — node with an action not in the catalog. - no_ui.json — BDT missing the UI layer entirely. - empty_nodes.json — valid envelope but zero nodes. Suite status: Ran 92 tests, OK. @W-22196528@		2026-04-23 23:29:05 +05:30
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broken_ref.json	test(bdt): unit tests + adversarial fixtures @W-22196528@	2026-04-23 23:29:05 +05:30
cycle.json	test(bdt): unit tests + adversarial fixtures @W-22196528@	2026-04-23 23:29:05 +05:30
empty_nodes.json	test(bdt): unit tests + adversarial fixtures @W-22196528@	2026-04-23 23:29:05 +05:30
no_ui.json	test(bdt): unit tests + adversarial fixtures @W-22196528@	2026-04-23 23:29:05 +05:30
unknown_action.json	test(bdt): unit tests + adversarial fixtures @W-22196528@	2026-04-23 23:29:05 +05:30