feat: project skeleton + settings + PKI index.txt reader

tests/test_pki.py

@@ -0,0 +1,59 @@
+import textwrap
+import pytest
+from datetime import datetime, timezone, timedelta
+from openvpncertupdate import load_expiring_certs, CertInfo, _parse_index_line
+
+
+def _fmt(dt: datetime) -> str:
+    return dt.strftime("%y%m%d%H%M%S") + "Z"
+
+
+def make_pki(tmp_path, now):
+    pki = tmp_path / "pki"
+    pki.mkdir()
+    content = textwrap.dedent(f"""\
+        V\t{_fmt(now + timedelta(days=10))}\t\t02\tunknown\t/CN=soon
+        V\t{_fmt(now + timedelta(days=90))}\t\t03\tunknown\t/CN=later
+        V\t{_fmt(now - timedelta(days=15))}\t\t04\tunknown\t/CN=past15
+        V\t{_fmt(now - timedelta(days=40))}\t\t05\tunknown\t/CN=past40
+        R\t{_fmt(now + timedelta(days=10))}\t230101Z,keyCompromise\t06\tunknown\t/CN=revoked
+    """)
+    (pki / "index.txt").write_text(content)
+    return str(pki)
+
+
+def test_filters_within_window(tmp_path):
+    now = datetime.now(tz=timezone.utc)
+    pki = make_pki(tmp_path, now)
+    certs = load_expiring_certs(pki, days_past=30, days_ahead=14)
+    cns = {c.cn for c in certs}
+    assert "soon" in cns        # 10d ahead < 14d threshold
+    assert "later" not in cns   # 90d > 14d
+    assert "past15" in cns      # 15d past < 30d threshold
+    assert "past40" not in cns  # 40d past > 30d threshold
+    assert "revoked" not in cns # R status skipped
+
+
+def test_sorted_ascending(tmp_path):
+    now = datetime.now(tz=timezone.utc)
+    pki = make_pki(tmp_path, now)
+    certs = load_expiring_certs(pki, days_past=30, days_ahead=14)
+    dates = [c.expires for c in certs]
+    assert dates == sorted(dates)
+
+
+def test_days_left_negative_for_expired(tmp_path):
+    now = datetime.now(tz=timezone.utc)
+    pki = make_pki(tmp_path, now)
+    certs = load_expiring_certs(pki, days_past=30, days_ahead=14)
+    expired = next(c for c in certs if c.cn == "past15")
+    assert expired.days_left < 0
+
+
+def test_parse_4digit_year():
+    line = "V\t20251231120000Z\t\t07\tunknown\t/CN=future"
+    result = _parse_index_line(line)
+    assert result is not None
+    cn, dt = result
+    assert cn == "future"
+    assert dt.year == 2025