feat: Network MCP Server v0.1.0 — SNMP backend with 5 tools

MVP with zero-dependency SNMP backend for AI-powered network management:
- get_snmp_value: query single OID
- walk_snmp_tree: walk OID subtree
- get_device_info: vendor auto-detection, uptime, location
- get_interfaces: interface status with human-readable output
- discover_devices: subnet SNMP discovery

Tech: FastMCP + pysnmp-lextudio, Python 3.10+
Works with: Cisco, Juniper, Arista, UniFi, Fortinet, and any SNMP device
23 tests passing

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

tests/test_config.py

@@ -0,0 +1,27 @@
+"""Tests for configuration module."""
+
+import os
+
+from network_mcp.config import get_default_community, get_snmp_timeout
+
+
+def test_default_community_from_env(monkeypatch):
+    monkeypatch.setenv("SNMP_COMMUNITY", "my_secret")
+    assert get_default_community() == "my_secret"
+
+
+def test_default_community_fallback(monkeypatch):
+    monkeypatch.delenv("SNMP_COMMUNITY", raising=False)
+    # Without config file, should return "public"
+    monkeypatch.setenv("NETWORK_MCP_CONFIG_DIR", "/tmp/nonexistent-mcp-test")
+    assert get_default_community() == "public"
+
+
+def test_snmp_timeout_from_env(monkeypatch):
+    monkeypatch.setenv("SNMP_TIMEOUT", "10.0")
+    assert get_snmp_timeout() == 10.0
+
+
+def test_snmp_timeout_default(monkeypatch):
+    monkeypatch.delenv("SNMP_TIMEOUT", raising=False)
+    assert get_snmp_timeout() == 5.0

tests/test_oids.py

@@ -0,0 +1,82 @@
+"""Tests for SNMP OID utilities."""
+
+from network_mcp.snmp.oids import detect_vendor, format_bytes, format_speed, format_uptime
+
+
+def test_detect_vendor_cisco():
+    assert detect_vendor("Cisco IOS Software, C2960 Software") == "Cisco"
+
+
+def test_detect_vendor_juniper():
+    assert detect_vendor("Juniper Networks, Inc. ex4300") == "Juniper"
+
+
+def test_detect_vendor_ubiquiti():
+    assert detect_vendor("Linux ubnt 4.14.0 UniFi Dream Machine") == "Ubiquiti"
+
+
+def test_detect_vendor_arista():
+    assert detect_vendor("Arista Networks EOS version 4.28") == "Arista"
+
+
+def test_detect_vendor_fortinet():
+    assert detect_vendor("FortiGate-60F v7.2.0") == "Fortinet"
+
+
+def test_detect_vendor_mikrotik():
+    assert detect_vendor("RouterOS 7.12") == "MikroTik"
+
+
+def test_detect_vendor_unknown():
+    assert detect_vendor("Some Unknown Device") == "Unknown"
+
+
+def test_detect_vendor_case_insensitive():
+    assert detect_vendor("CISCO IOS XE") == "Cisco"
+
+
+def test_format_uptime_days():
+    # 2 days, 3 hours, 4 minutes, 5 seconds = 183845 seconds * 100
+    assert format_uptime(18384500) == "2d 3h 4m 5s"
+
+
+def test_format_uptime_hours():
+    assert format_uptime(370500) == "1h 1m 45s"
+
+
+def test_format_uptime_minutes():
+    assert format_uptime(12000) == "2m 0s"
+
+
+def test_format_speed_gbps():
+    assert format_speed(1_000_000_000) == "1 Gbps"
+    assert format_speed(10_000_000_000) == "10 Gbps"
+
+
+def test_format_speed_mbps():
+    assert format_speed(100_000_000) == "100 Mbps"
+    assert format_speed(1_000_000) == "1 Mbps"
+
+
+def test_format_speed_kbps():
+    assert format_speed(64_000) == "64 Kbps"
+
+
+def test_format_bytes_tb():
+    assert "TB" in format_bytes(2_000_000_000_000)
+
+
+def test_format_bytes_gb():
+    assert "GB" in format_bytes(5_000_000_000)
+
+
+def test_format_bytes_mb():
+    assert "MB" in format_bytes(50_000_000)
+
+
+def test_format_bytes_kb():
+    assert "KB" in format_bytes(50_000)
+
+
+def test_format_bytes_bytes():
+    assert format_bytes(500) == "500 B"