test: cover between/hostvar/gcov-merge, class conditions, schema drop-tables, gixsql fixes

tests/test_orchestrator_db_gcov_merge.py

@@ -0,0 +1,65 @@
+r"""子程序 gcov 行号不得并入主程序 gcov 字典的回归测试。
+
+Bug：`generate_coverage_report` 用 `gcov_data.update(sub_merged)` 把子程序
+(SUB*.cbl) 的 gcov 行计数并入主程序行号字典。主程序与子程序的行号都是纯
+整数，直接碰撞——SUB04CHK 的第 167 行（count=0）覆盖了 SHA02MNC 主程序
+第 167 行（count=25，主循环 PERFORM 已进入），导致 #10 Enter 分支被误判为
+未覆盖（SHA02MNC 覆盖率从应有的水平被拉低）。
+
+修复：子程序 gcov 按子程序名独立保存（`_sub_gcov_data`），不并入主程序
+`gcov_data`。`_merge_run_dirs_gcov` 对单个程序跨 run 目录合并。
+"""
+
+import sys, os
+sys.path.insert(0, os.path.abspath(os.path.join(os.path.dirname(__file__), "..")))
+from pathlib import Path
+from cobol_testgen.gcov import parse_cbl_gcov
+from orchestrator_db import _merge_run_dirs_gcov
+
+
+def _write_fake_gcov(dirpath: Path, name: str, counts: dict[int, int]):
+    lines = []
+    for ln in sorted(counts):
+        cnt = counts[ln]
+        marker = "#####" if cnt == 0 else f"{cnt}*"
+        lines.append(f"{marker}:{ln}:  dummy source line\n")
+    (dirpath / f"{name}.cbl.gcov").write_text("".join(lines), encoding="utf-8")
+
+
+def _fake_gcov_func(name: str, d: str):
+    return parse_cbl_gcov(os.path.join(d, f"{name}.cbl.gcov"))
+
+
+def test_sub_gcov_line_collision_does_not_corrupt_main(tmp_path):
+    run_normal = tmp_path / "run_normal"; run_normal.mkdir()
+    run_fail = tmp_path / "run_fail"; run_fail.mkdir()
+
+    # 主程序：line 167 在 normal 场景执行 25 次（主循环进入）
+    _write_fake_gcov(run_normal, "MAIN", {167: 25, 265: 1})
+    _write_fake_gcov(run_fail, "MAIN", {167: 0, 265: 1})
+    # 子程序：line 167 从未执行（count=0）——与主程序行号碰撞
+    _write_fake_gcov(run_normal, "SUB", {167: 0, 10: 1})
+    _write_fake_gcov(run_fail, "SUB", {167: 0, 10: 1})
+
+    main = _merge_run_dirs_gcov(tmp_path, "MAIN", gcov_func=_fake_gcov_func)
+    sub = _merge_run_dirs_gcov(tmp_path, "SUB", gcov_func=_fake_gcov_func)
+
+    # 合并后主程序 167 必须保持 25
+    assert main[167] == 25, f"main line 167 corrupted: {main[167]}"
+    assert sub[167] == 0
+
+    # 旧 bug 行为演示：若把子程序并入主程序字典，167 会被覆盖为 0
+    buggy = dict(main)
+    buggy.update(sub)
+    assert buggy[167] == 0, "demonstrates the corruption the fix avoids"
+    # 修复不变量：子程序数据独立保存，主程序字典完好
+    assert main[167] == 25
+
+
+def test_merge_run_dirs_takes_max_count(tmp_path):
+    r1 = tmp_path / "run_a"; r1.mkdir()
+    r2 = tmp_path / "run_b"; r2.mkdir()
+    _write_fake_gcov(r1, "MAIN", {167: 25})
+    _write_fake_gcov(r2, "MAIN", {167: 3})
+    merged = _merge_run_dirs_gcov(tmp_path, "MAIN", gcov_func=_fake_gcov_func)
+    assert merged[167] == 25