Add search self-tests (hash consistency, QSearch sanity) and a native EPD parser (`epd` command + ParseEpdRecord), fixing a silent-corruption bug in convert_epd.pl that broke every Black-to-move EPD conversion.

testsearch.c: TestSearchHashConsistency exercises the hash table through real search (repeat-with-warm-table and shallow-then-deep agreement) rather than synthetic store/probe calls. TestQSearchSanity checks termination and a node-count ceiling; its own header documents that the TEST=1 self-test build doesn't define PERF_COUNTERS, so it checks whole-search node count rather than the qsearch-only counter. A planned null-move zugzwang test was dropped in favor of tests/zugzwang.epd (best-move outcome, not an internal counter) after the three classic literature positions turned out not to structurally reach this engine's verification-search code path on this build.

fen.c/script.c/command.c: new `epd <file>` command reads raw EPD directly via ParseEpdRecord, reusing ScriptCommand's existing suite-reporting machinery (factored into _ProcessSuiteLine/_PrintSuiteReport). Replaces the need for tests/convert_epd.pl, which had a real bug: its bm/am regex's [^b]+ filler breaks on any Black-to-move record (side-to-move field is literally "b"), and unscoped $fen/$id/$solution globals meant a failed match silently duplicated the previous record instead of erroring.

tests/ep_to_epd.pl converts the existing setboard/solution/avoid/id/go suites back to real EPD; cross-checked ecm_ringers.ep_ via `script` against ecm_ringers.epd via `epd` -- byte-identical node counts and solve stats. Added .epd siblings for every genuine tactical suite in tests/.

Added src/TESTING_PLAN.md: full audit of test*.c coverage gaps (dead SEE oracle, unwired eval/recognizer tests, zero hash-table correctness coverage, thin search self-tests) with a prioritized plan for closing them.

Co-Authored-By: Claude Sonnet 5 <[email protected]>

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/ecm_ringers.epd b/tests/ecm_ringers.epd
new file mode 100644
index 0000000..a0dce6a
--- /dev/null
+++ b/tests/ecm_ringers.epd
@@ -0,0 +1,11 @@
+k3r3/pR5p/PppR1p1p/4nP2/1PP5/8/4B1rP/2K5 w - - bm Re7; id "ECM.213";
+6k1/1p3p2/4r1p1/1PPrbq1p/2QN4/P2R1P1P/R4KP1/8 b - - bm Bg3+; id "ECM.270";
+8/5p2/4p1k1/4P1p1/2rBRbK1/5P2/r4P2/7R b - - bm Rxd4; id "ECM.335";
+4rqk1/p5b1/3p3p/3Pn1p1/1pP1NrP1/4NP2/P3Q1P1/1K1RR3 b - - bm Nxf3; id "ECM.501";
+R2b2k1/2rq1n1p/3p2p1/1p1Ppp1n/1P6/1B1PQN1P/1B3PP1/6K1 w - - bm Nxe5; id "ECM.406";
+r1qb1r1k/2p3pp/p1n1bp2/1p1Np2Q/P3P3/1BP3R1/1P3PPP/R1B3K1 w - - bm Rxg7; id "ECM.717";
+4rrk1/2pn2pb/p1p1qp2/1pb1pN2/P3P1PN/1P1P4/1BP2PK1/R2Q3R w - - bm Nxg7; id "ECM.721";
+r3k2r/p1qb1p2/1p2p2p/3pPpN1/P1nP3Q/8/2P2PPP/R1B1R1K1 w kq - bm Nxf7; id "ECM.746";
+2r1r1k1/5ppp/pq3b2/2pB1P2/2p2B2/5Q1P/Pn3PP1/2R1R1K1 w - - bm Bxf7+; id "ECM.750";
+6rk/3b1n1p/1p1q3b/1PpNp3/2P1Pp2/2Q2NrP/5RP1/2R2B1K b - - bm Bxh3; id "ECM.783";
+r6r/ppnqpk2/3pbpp1/5N2/1PP1P3/5RR1/P2QB1PP/6K1 w - - bm Nh6+; id "ECM.801";