test: 覆盖率提升至 100%（fail_under 90→99，13 个防御/边界用例）

tests/test_config.py

@@ -48,4 +48,14 @@ def test_env_placeholder_expansion(monkeypatch):
 def test_redacted_hides_secrets():
     s = Settings.from_dir(FIXTURES)
     red = s.get_redacted()
-    assert red["rag"]["vector_store"]["qdrant"]["api_key"] == "***"
+    assert red["rag"]["vector_store"]["qdrant"]["api_key"] == "***"
+
+
+def test_expand_env_list_branch(monkeypatch):
+    # _expand_env 的 list 分支（L134）：列表项递归展开环境占位
+    from genesis.config import _expand_env
+    monkeypatch.setenv("QDRANT_API_KEY", "sk-list-xyz")
+    data = {"models": [{"name": "a", "key": "${QDRANT_API_KEY}"}, "plain"]}
+    out = _expand_env(data)
+    assert out["models"][0]["key"] == "sk-list-xyz"
+    assert out["models"][1] == "plain"

tests/test_excel_parser.py

@@ -4,6 +4,43 @@ from genesis.parsers.excel_parser import ExcelParseResult, ExcelParser
 from tests.excel_helpers import new_workbook, save_workbook
 
 
+def test_parse_skips_empty_sheet(tmp_path):
+    # 空 sheet → skipped 不进入（L skips 分支）
+    wb = new_workbook({"空白": [[]]})
+    path = save_workbook(tmp_path, wb)
+    result = ExcelParser().parse(path)
+    assert "空白" in result.skipped
+    assert result.tables == []
+
+
+def test_parse_mixed_formatting_outside_table_segment(tmp_path):
+    # 碎片段（free_text 段）存在取消线格式 → seg_fmt_map 构建时该行不在表格段 [s,e] 内，被跳过（66-65 分支）
+    from copy import copy
+    from openpyxl import Workbook
+    wb = Workbook()
+    ws = wb.active
+    ws.title = "混合"
+    data = [
+        ["機能ID", "機能名"], ["F101", "社員登録"],
+        [],
+        ["・改述ポイント"],
+    ]
+    for r, row in enumerate(data, start=1):
+        for c, v in enumerate(row, start=1):
+            if v:
+                ws.cell(row=r, column=c, value=v)
+    font = copy(ws.cell(row=4, column=1).font)  # 碎片段行（物理行 4）
+    font.strike = True
+    ws.cell(row=4, column=1).font = font
+    path = save_workbook(tmp_path, wb)
+    result = ExcelParser().parse(path)
+    ms = result.mixed[0]
+    tbl = [p.table for p in ms.paragraphs if p.kind == "table"][0]
+    # 表格段数据行不应带上碎片段的取消线格式
+    assert tbl.rows[0]["機能ID"].formatting is None
+    assert len(tbl.rows) == 1
+
+
 def test_parse_table_sheets(tmp_path):
     wb = new_workbook({
         "機能一覧": [["機能ID", "機能名"], ["A001", "社員登録"]],

tests/test_formatting_detector.py

@@ -59,4 +59,58 @@ def test_cell_comment_returns_obj():
 
 def test_collect_comments():
     comments = collect_comments(make_wb().active, "f.xlsx")
-    assert len(comments) == 1
+    assert len(comments) == 1
+
+
+def test_to_rgb_hex_accepts_6_digit_hex():
+    from types import SimpleNamespace
+    from genesis.parsers.formatting_detector import _to_rgb_hex
+    assert _to_rgb_hex(SimpleNamespace(rgb="FF3333")) == "FF3333"
+    assert _to_rgb_hex(SimpleNamespace(rgb="00FF00FF")) == "00FF00FF"
+
+
+def test_to_rgb_hex_rejects_black_and_theme():
+    from types import SimpleNamespace
+    from genesis.parsers.formatting_detector import _to_rgb_hex
+    # 纯黑（默认色）与主题色（rgb 为空/异常/非 hex）→ None
+    assert _to_rgb_hex(SimpleNamespace(rgb="00000000")) is None
+    assert _to_rgb_hex(SimpleNamespace(rgb="FF000000")) is None
+    assert _to_rgb_hex(SimpleNamespace(rgb="")) is None
+    assert _to_rgb_hex(SimpleNamespace(rgb="ZZZZZZ")) is None
+    assert _to_rgb_hex(SimpleNamespace(rgb="FFFFF")) is None  # 长度不足
+
+
+class _ExplodingRgb:
+    @property
+    def rgb(self):
+        raise Exception("boom")
+
+
+def test_to_rgb_hex_rgb_access_exception_returns_none():
+    from genesis.parsers.formatting_detector import _to_rgb_hex
+    # L15-16：color.rgb 访问抛异常 → 返回 None（防御分支）
+    assert _to_rgb_hex(_ExplodingRgb()) is None
+
+
+def test_cell_formatting_fills_only_color():
+    from copy import copy
+    from openpyxl.styles import PatternFill
+    from genesis.parsers.formatting_detector import cell_formatting
+    wb = Workbook()
+    ws = wb.active
+    ws["A1"] = "x"
+    # 仅背景色（无 strikethrough / 无字体色）→ 返回 CellFormatting 含 bg_color
+    f = copy(ws["A1"].fill)
+    f.fgColor = PatternFill(start_color="00CC00").fgColor
+    ws["A1"].fill = f
+    fmt = cell_formatting(ws["A1"])
+    assert fmt is not None
+    assert fmt.bg_color is not None
+
+
+def test_cell_formatting_fill_none_branch():
+    # 覆盖 L31 防御分支：fill 为 None（无样式对象）时直接返回 None
+    from types import SimpleNamespace
+    from genesis.parsers.formatting_detector import cell_formatting
+    fake = SimpleNamespace(font=SimpleNamespace(strike=False), fill=None)
+    assert cell_formatting(fake) is None

tests/test_sheet_nature.py

@@ -29,4 +29,21 @@ def test_classify_sheet_mixed_with_bullet_line():
 
 def test_classify_sheet_mixed_with_square_line():
     m = [["ID", "名前"], ["1", "田中"], ["■備考行"]]
-    assert classify_sheet(m) == SheetNature.MIXED
+    assert classify_sheet(m) == SheetNature.MIXED
+
+
+def test_classify_empty_matrix_is_free_text():
+    # 空矩阵：_free_text_like 对空矩阵返回 True（L26 分支）
+    assert classify_sheet([]) == SheetNature.FREE_TEXT
+
+
+def test_classify_sparse_multicol_is_free_text():
+    # 多列但非空行占比 < 0.7 → FREE_TEXT（L32 稀疏分支）
+    m = [["ID", "名前"], [], [], [], [], ["1", "田中"]]
+    assert classify_sheet(m) == SheetNature.FREE_TEXT
+
+
+def test_classify_header_no_bullet_is_table():
+    # 表头有效且无 ・/■ 行 → 落入 TABLE（L40→44 无匹配循环路径）
+    m = [["ID", "名前"], ["1", "田中"], ["2", "佐藤"]]
+    assert classify_sheet(m) == SheetNature.TABLE

tests/test_table_extractor.py

@@ -49,4 +49,20 @@ def test_extract_table_uses_enum_value():
 def test_forward_fill_ignores_invalid_range():
     matrix = [["A"], ["B"]]
     assert forward_fill(matrix, [(0, 1, 2, 1)]) == matrix  # min_row=0 非法 → 不崩溃不改数据
-    assert forward_fill(matrix, [(9, 9, 9, 9)]) == matrix  # 越界 → 不崩溃
+    assert forward_fill(matrix, [(9, 9, 9, 9)]) == matrix  # 越界 → 不崩溃
+
+
+def test_extract_table_empty_matrix():
+    # 空矩阵 → 返回空表（headers/rows 均为空），不崩溃（L 空矩阵分支）
+    table = extract_table("空シート", [], "f.xlsx", SheetType.FUNCTION)
+    assert table.headers == []
+    assert table.rows == []
+
+
+def test_extract_table_header_row_out_of_range():
+    # header_row 越界/负值 → 回落 0（防御分支）
+    mat = [["ID", "名前"], ["1", "田中"]]
+    t_high = extract_table("社員", mat, "f.xlsx", SheetType.FUNCTION, header_row=9)
+    t_neg = extract_table("社員", mat, "f.xlsx", SheetType.FUNCTION, header_row=-1)
+    assert t_high.headers == ["ID", "名前"]
+    assert t_neg.headers == ["ID", "名前"]