test: add comprehensive unit tests for all managers

tests/unit/test_dns_logic.py

@@ -0,0 +1,46 @@
+import pytest
+from unittest.mock import MagicMock, patch
+from infra_cli.dns import DNSManager
+
+class MockConfig:
+    def get_node(self, name):
+        return {"host": "10.32.2.1", "pass": "secret"}
+    def get(self, key, default=None):
+        if key == 'proxmox.dnsmasq_lxc_id': return '11209'
+        return default
+
+@patch('infra_cli.dns.SSHClient')
+def test_dns_add_host_logic(mock_ssh):
+    mock_instance = mock_ssh.return_value
+    
+    # Calls in order:
+    # 1. touch (success 0)
+    # 2. grep (fail 1, not found)
+    # 3. echo (success 0)
+    # 4. test (success 0)
+    # 5. reload (success 0)
+    res_touch = MagicMock(returncode=0)
+    res_mac_check = MagicMock(returncode=1) 
+    res_echo = MagicMock(returncode=0)
+    res_test = MagicMock(returncode=0)
+    res_reload = MagicMock(returncode=0)
+    
+    mock_instance.run.side_effect = [res_touch, res_mac_check, res_echo, res_test, res_reload]
+    
+    mgr = DNSManager(MockConfig())
+    mgr.add_host("aa:bb:cc:11:22:33", "10.32.70.100", "test-host")
+    
+    # Verify the commands called
+    calls = [str(c) for c in mock_instance.run.call_args_list]
+    assert any("dhcp-host=aa:bb:cc:11:22:33,test-host,10.32.70.100" in c for c in calls)
+
+@patch('infra_cli.dns.SSHClient')
+def test_dns_duplicate_mac_prevention(mock_ssh):
+    mock_instance = mock_ssh.return_value
+    # 1. touch (0)
+    # 2. grep (0, exists)
+    mock_instance.run.side_effect = [MagicMock(returncode=0), MagicMock(returncode=0)]
+    
+    mgr = DNSManager(MockConfig())
+    with pytest.raises(ValueError, match="already exists"):
+        mgr.add_host("aa:bb:cc:11:22:33", "10.32.70.100", "test-host")