test(codes): compare with zxing-cpp reference rows and decode encoder output and screenshots

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

1 files changed, 65 insertions, 0 deletions

diff --git a/tools/tests/test_barcode_tools.py b/tools/tests/test_barcode_tools.py
new file mode 100644
index 0000000..7be1f18
--- /dev/null
+++ b/tools/tests/test_barcode_tools.py
@@ -0,0 +1,65 @@
+# Author:  cirakg & claude ai
+# Summary: Tests for the barcode reference tools: zxing-cpp rows, rendering, decoding, check digits, generator, checker.
+from __future__ import annotations
+
+import random
+from pathlib import Path
+
+import barcode_ref as ref
+import check_codes
+import gen_code_vectors
+
+ROOT = Path(__file__).resolve().parents[2]
+
+
+def test_reference_rows_have_the_standard_lengths() -> None:
+    assert ref.reference_modules(ref.EAN13, "590123412345") == (
+        "10100010110100111011001100100110111101001110101010110011011011001000010101110010011101000100101"
+    )
+    assert len(ref.reference_modules(ref.EAN8, "1234567")) == 67
+    assert len(ref.reference_modules(ref.UPCE, "0425261")) == 51
+
+
+def test_rendered_codes_decode() -> None:
+    modules = ref.reference_modules(ref.CODE39, "ABC")
+    for scale in (1, 2, 3):
+        assert ref.decode(ref.render_linear(modules, scale), ref.CODE39) == ["ABC"]
+
+
+def test_check_digits() -> None:
+    assert ref.gs1_check("590123412345") == 7
+    assert ref.gs1_check("1234567") == 0
+    assert ref.code39_check("CODE 39") == "R"  # (12+24+13+14+38+3+9) % 43 = 27
+
+
+def test_expected_reading_normalises_upc() -> None:
+    assert ref.expected_reading(ref.UPCA, "012345678905") == "0012345678905"
+    assert ref.upce_expand("01234565") == "0012345000065"
+
+
+def test_generator_only_makes_canonical_upce() -> None:
+    rng = random.Random(5)
+    for _ in range(200):
+        d = gen_code_vectors.valid_upce(rng)
+        ref.reference_modules(ref.UPCE, "0" + d)  # zxing-cpp rejects non-canonical ones
+
+
+def test_committed_vectors_match_the_generator() -> None:
+    rows = gen_code_vectors.cases(random.Random(1212), 25)
+    committed = (ROOT / "test" / "data" / "CodeVectors.mc").read_text(encoding="utf-8")
+    assert committed == gen_code_vectors.render(rows, 1212)
+
+
+def test_check_codes_reads_dump_lines(tmp_path: Path) -> None:
+    good = ref.reference_modules(ref.EAN8, "1234567")
+    log = tmp_path / "dev.log"
+    log.write_text(
+        f"CODEDUMP {ref.EAN8} {b'12345670'.hex()} {good}\nCODEDUMP {ref.EAN8} {b'12345670'.hex()} {good[:-5]}00000\n",
+        encoding="utf-8",
+    )
+    checked, failures = check_codes.check_log(log)
+    assert checked == 2 and len(failures) == 3  # the damaged code fails at all three sizes
+    assert check_codes.main([str(log)]) == 1
+    empty = tmp_path / "empty.log"
+    empty.write_text("nothing\n", encoding="utf-8")
+    assert check_codes.main([str(empty)]) == 2