test(codes): compare Data Matrix and PDF417 with references and decode them, also from screenshots

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 25 insertions, 1 deletions

diff --git a/tools/tests/test_barcode_tools.py b/tools/tests/test_barcode_tools.py
index 0ee3cc4..5a2e999 100644
--- a/tools/tests/test_barcode_tools.py
+++ b/tools/tests/test_barcode_tools.py
@@ -8,6 +8,7 @@ from pathlib import Path
 import barcode_ref as ref
 import check_codes
 import gen_code_vectors
+import gen_pdf417_tables
 import gen_qr_tables
 
 ROOT = Path(__file__).resolve().parents[2]
@@ -83,5 +84,28 @@ def test_segno_padding_quirk_detection() -> None:
 
 def test_rendered_qr_matrix_decodes() -> None:
     _, _, hexbits = gen_code_vectors.qr_reference("HELLO WORLD", 1, 1, 2)
-    image = ref.render_matrix(bytes.fromhex(hexbits), 21, 2, quiet=4)
+    image = ref.render_matrix(bytes.fromhex(hexbits), (21, 21), 2, quiet=4)
     assert ref.decode(image, ref.QR) == ["HELLO WORLD"]
+
+
+def test_committed_pdf417_tables_match_pdf417gen(tmp_path: Path) -> None:
+    gen_pdf417_tables.main(["--out-dir", str(tmp_path)])
+    for path in tmp_path.iterdir():
+        assert path.read_text(encoding="utf-8") == (ROOT / "resources" / "pdf417" / path.name).read_text(
+            encoding="utf-8"
+        )
+    codes = gen_pdf417_tables.tables()
+    assert len(codes["codes0"]["v"]) == 929  # type: ignore[index]
+
+
+def test_ppf_padding_quirk_detection() -> None:
+    # (149 * pos) % 253 == 124 at pos 124 * 149^-1 mod 253; a 10x10 symbol
+    # (3 data codewords) has no pad at such a position.
+    assert not gen_code_vectors.ppf_pad_differs("a", 10)
+    assert any(gen_code_vectors.ppf_pad_differs("x" * n, 88) for n in (480, 500, 520))
+
+
+def test_pdf417_reference_rows() -> None:
+    reference = gen_code_vectors.pdf417_reference("Hello, World!", 3, 2)
+    assert reference is not None and reference[0] == 7 and reference[1] == 17 * (3 + 4) + 1
+    assert gen_code_vectors.pdf417_reference("ab", 30, 0) is None  # one row: below the minimum of 3