init

tests/test_csv.py

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+from pathlib import Path
+
+from common_cents.csv_export import write_csv
+from common_cents.csv_import import parse_csv
+
+
+def _row(date, cents, cat, merch=None, notes=None, tags=None):
+    return {
+        "date": date,
+        "cents": cents,
+        "category": cat,
+        "merchant": merch,
+        "notes": notes,
+        "tags": tags or [],
+    }
+
+
+def test_export_then_import_roundtrip(tmp_path: Path):
+    rows = [
+        _row("2026-01-01", 100, "A", "M", None, ["x", "y"]),
+        _row("2026-01-02", 200, "B", None, 'Hello, "world"'),
+        _row("2026-01-03", 300, "C:D", None, None, ["t1", "t2", "t3"]),
+    ]
+    p = tmp_path / "out.csv"
+    write_csv(p, rows)
+    result = parse_csv(p)
+    assert result.errors == []
+    assert len(result.rows) == 3
+    assert result.rows[0].tags == ["x", "y"]
+    assert result.rows[1].notes == 'Hello, "world"'
+    assert result.rows[2].tags == ["t1", "t2", "t3"]
+
+
+def test_parse_csv_missing_required(tmp_path: Path):
+    p = tmp_path / "bad.csv"
+    p.write_text("DATE,MERCHANT\n2026-01-01,Joe\n")
+    result = parse_csv(p)
+    assert result.errors
+    assert "CATEGORY" in result.errors[0]
+    assert "CENTS" in result.errors[0]
+
+
+def test_parse_csv_missing_optional_warns(tmp_path: Path):
+    p = tmp_path / "ok.csv"
+    p.write_text("DATE,CENTS,CATEGORY,MERCHANT\n2026-01-01,100,Food,Joe\n")
+    result = parse_csv(p)
+    assert result.errors == []
+    assert any("NOTES" in w and "TAGS" in w for w in result.warnings)
+    assert len(result.rows) == 1
+
+
+def test_parse_csv_invalid_date(tmp_path: Path):
+    p = tmp_path / "bad.csv"
+    p.write_text("DATE,CENTS,CATEGORY,MERCHANT\nnot-a-date,100,Food,\n")
+    result = parse_csv(p)
+    assert any("invalid date" in e for e in result.errors)
+    assert result.rows == []
+
+
+def test_parse_csv_zero_cents_rejected(tmp_path: Path):
+    p = tmp_path / "bad.csv"
+    p.write_text("DATE,CENTS,CATEGORY,MERCHANT\n2026-01-01,0,Food,\n")
+    result = parse_csv(p)
+    assert any("positive" in e for e in result.errors)
+
+
+def test_parse_csv_comma_formatted_cents(tmp_path: Path):
+    p = tmp_path / "ok.csv"
+    p.write_text(
+        'DATE,CENTS,CATEGORY,MERCHANT\n2026-01-01,"14,901",Food,\n'
+    )
+    result = parse_csv(p)
+    assert result.errors == []
+    assert result.rows[0].cents == 14901
+
+
+def test_export_sorts_nothing_within_row(tmp_path: Path):
+    """write_csv preserves caller's tag order; sorting is the DB layer's job."""
+    p = tmp_path / "out.csv"
+    write_csv(p, [_row("2026-01-01", 100, "A", None, None, ["zeta", "alpha"])])
+    text = p.read_text()
+    assert '"zeta,alpha"' in text