feat: NAPALM driver for HPE OfficeConnect 1820/1920S

These switches have no CLI at all — no SSH, no Telnet and no ArubaOS-Switch
REST API — so the ProCurve driver cannot serve them despite the shared
vendor. The only management surface is the web UI, which ships its table
data as JavaScript array literals; those parse with ast.literal_eval, so
the driver needs no HTML parser and no dependency beyond napalm/requests.

Read-only by design: the platform exposes a single administrator account
with no privilege levels, and serves HTTPS only after a certificate has
been uploaded, so the polling credential is necessarily the admin
credential over a plain channel.

Implements get_facts, get_interfaces, get_vlans, get_vlans_detail and
get_mac_address_table, plus HTTP/SNMP fingerprints for discovery.

Tested against an HPE OfficeConnect 1820 8G PoE+ (65W), J9982A, PT.02.19.

tests/unit/test_parsers.py

@@ -0,0 +1,134 @@
+"""Unit tests for the OfficeConnect HTML/JS parsers.
+
+Fixtures are real pages captured from an HPE OfficeConnect 1820 8G PoE+
+(J9982A, firmware PT.02.19), scrubbed of serial number, MAC addresses,
+IP addresses and hostname.
+"""
+
+import pathlib
+
+import pytest
+
+from napalm_hpe_officeconnect import parsers
+
+FIXTURES = pathlib.Path(__file__).parent.parent / "fixtures"
+
+
+def fixture(name: str) -> str:
+    return (FIXTURES / f"{name}.html").read_text(encoding="utf-8")
+
+
+# ===========================================================================
+# extract_data_set — the DataTables payload every list page ships
+# ===========================================================================
+
+
+def test_extract_data_set_returns_one_row_per_port():
+    """port_summary carries 8 physical ports plus 4 trunk interfaces."""
+    rows = parsers.extract_data_set(fixture("base_port_summary"))
+    assert len(rows) == 12
+    assert all(isinstance(r, list) for r in rows)
+
+
+def test_extract_data_set_preserves_cell_values():
+    rows = parsers.extract_data_set(fixture("base_port_summary"))
+    # Columns: [checkbox, interface, description, admin, phy type, status, ...]
+    assert rows[0][1] == "1"
+    assert rows[0][3] == "Enabled"
+    assert rows[2][5] == "Link Up"
+    assert rows[2][7] == "1000 Mbps"
+
+
+def test_extract_data_set_handles_rows_without_markup():
+    """mac_address_table rows are plain values, no embedded checkbox cell."""
+    rows = parsers.extract_data_set(fixture("base_mac_address_table"))
+    assert len(rows) == 17
+    assert rows[0] == ["1", "00:11:22:33:44:01", "7", "7", "Learned"]
+
+
+def test_extract_data_set_handles_empty_cells():
+    """Counter columns are empty strings on a port that never linked up."""
+    rows = parsers.extract_data_set(fixture("base_port_summary_stats"))
+    assert rows[0] == ["1", "", "", "", "", "", "", "", ""]
+
+
+def test_extract_data_set_returns_empty_list_when_absent():
+    assert parsers.extract_data_set("<html><body>nothing here</body></html>") == []
+
+
+# ===========================================================================
+# extract_column_titles — used to assert the firmware layout hasn't shifted
+# ===========================================================================
+
+
+def test_extract_column_titles():
+    titles = parsers.extract_column_titles(fixture("switching_vlan_status"))
+    assert titles == ["VLAN ID", "Name", "Type"]
+
+
+def test_extract_column_titles_skips_markup_only_header():
+    """The leading checkbox column has an <input> as its title, not text."""
+    titles = parsers.extract_column_titles(fixture("base_mac_address_table"))
+    assert titles == ["VLAN ID", "MAC Address", "Interface", "Interface Index", "Status"]
+
+
+# ===========================================================================
+# strip_markup — the checkbox cell must collapse to an empty string
+# ===========================================================================
+
+
+@pytest.mark.parametrize(
+    "raw,expected",
+    [
+        ('<input type="checkbox" value="1"><label></label>', ""),
+        ("plain value", "plain value"),
+        ("&nbsp;spaced&amp;out ", "spaced&out"),
+        ("", ""),
+    ],
+)
+def test_strip_markup(raw, expected):
+    assert parsers.strip_markup(raw) == expected
+
+
+# ===========================================================================
+# parse_uptime
+# ===========================================================================
+
+
+@pytest.mark.parametrize(
+    "raw,expected",
+    [
+        ("0 days, 18 hours, 44 mins, 40 secs", 67480),
+        ("3 days, 0 hours, 0 mins, 0 secs", 259200),
+        ("0 days, 0 hours, 0 mins, 1 secs", 1),
+    ],
+)
+def test_parse_uptime(raw, expected):
+    assert parsers.parse_uptime(raw) == expected
+
+
+def test_parse_uptime_returns_negative_one_when_unparseable():
+    """NAPALM's convention for 'uptime unknown' is -1, not 0."""
+    assert parsers.parse_uptime("nonsense") == -1
+
+
+# ===========================================================================
+# parse_facts — dashboard.lsp
+# ===========================================================================
+
+
+def test_parse_facts():
+    facts = parsers.parse_facts(fixture("base_dashboard"))
+    assert facts["hostname"] == "testswitch"
+    assert facts["serial_number"] == "CN0FIXTURE0"
+    assert facts["os_version"] == "PT.02.19"
+    assert facts["model"] == "HPE OfficeConnect Switch 1820 8G PoE+ (65W) J9982A"
+    assert facts["uptime"] == 67480
+    assert facts["sys_object_id"] == "1.3.6.1.4.1.11.2.3.7.11.170"
+
+
+def test_parse_facts_tolerates_missing_fields():
+    facts = parsers.parse_facts("<html><body></body></html>")
+    assert facts["hostname"] == ""
+    assert facts["serial_number"] == ""
+    assert facts["uptime"] == -1