feat: add two-digit counter suffix to vpn-configs dir (CN_YYYY-MM-DD_NN)

tests/test_config_builder.py

@@ -26,3 +26,57 @@ def test_output_path_has_cn_and_date(tmp_path):
     result = build_ovpn("bob", pki, str(tmpl), str(tmp_path / "out"), "vpn.ovpn")
     assert f"bob_{today}" in result
     assert result.endswith("vpn.ovpn")
+
+
+def test_first_issuance_uses_counter_00(tmp_path):
+    pki = setup_pki(tmp_path, "carol")
+    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
+    today = date.today().strftime("%Y-%m-%d")
+    result = build_ovpn("carol", pki, str(tmpl), str(tmp_path / "out"), "vpn.ovpn")
+    assert f"carol_{today}_00" in result
+
+
+def test_second_issuance_same_day_uses_counter_01(tmp_path):
+    pki = setup_pki(tmp_path, "dave")
+    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
+    today = date.today().strftime("%Y-%m-%d")
+    out = str(tmp_path / "out")
+    build_ovpn("dave", pki, str(tmpl), out, "vpn.ovpn")
+    result2 = build_ovpn("dave", pki, str(tmpl), out, "vpn.ovpn")
+    assert f"dave_{today}_01" in result2
+
+
+def test_counter_skips_to_max_plus_one(tmp_path):
+    """If _00 and _02 already exist (gap), next counter is 03, not 01."""
+    pki = setup_pki(tmp_path, "eve")
+    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
+    today = date.today().strftime("%Y-%m-%d")
+    out = tmp_path / "out"
+    (out / f"eve_{today}_00").mkdir(parents=True)
+    (out / f"eve_{today}_02").mkdir(parents=True)
+    result = build_ovpn("eve", pki, str(tmpl), str(out), "vpn.ovpn")
+    assert f"eve_{today}_03" in result
+
+
+def test_different_cn_same_day_does_not_affect_counter(tmp_path):
+    pki_a = setup_pki(tmp_path / "a", "alice")
+    pki_b = setup_pki(tmp_path / "b", "bob")
+    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
+    today = date.today().strftime("%Y-%m-%d")
+    out = str(tmp_path / "out")
+    build_ovpn("alice", str(tmp_path / "a" / "pki"), str(tmpl), out, "vpn.ovpn")
+    result = build_ovpn("bob", str(tmp_path / "b" / "pki"), str(tmpl), out, "vpn.ovpn")
+    assert f"bob_{today}_00" in result
+
+
+def test_next_day_counter_resets_to_00(tmp_path):
+    """Directories from a different date don't affect today's counter."""
+    pki = setup_pki(tmp_path, "frank")
+    tmpl = tmp_path / "t.ovpn"; tmpl.write_text("")
+    today = date.today().strftime("%Y-%m-%d")
+    out = tmp_path / "out"
+    # Simulate yesterday's directories already present
+    (out / "frank_2000-01-01_00").mkdir(parents=True)
+    (out / "frank_2000-01-01_05").mkdir(parents=True)
+    result = build_ovpn("frank", pki, str(tmpl), str(out), "vpn.ovpn")
+    assert f"frank_{today}_00" in result