Feat #2: add Host Entry from selected

tests/test_add_entry_modal.py

@@ -8,7 +8,7 @@ DNS name entries, validation, and mutual exclusion logic.
 import pytest
 from typing import cast
 from unittest.mock import Mock
-from textual.widgets import Input, Checkbox, RadioSet, Static
+from textual.widgets import Input, Checkbox, RadioSet, RadioButton, Static
 
 from src.hosts.tui.add_entry_modal import AddEntryModal
 from src.hosts.core.models import HostEntry
@@ -267,6 +267,50 @@ class TestAddEntryModalRadioButtonLogic:
         mock_hostname_input.focus.assert_called_once()
 
 
+@pytest.mark.asyncio
+async def test_prefilled_dns_modal_keeps_separate_address_drafts_when_switching_type():
+    """A copied DNS Entry retains both address drafts while its type is changed."""
+    from src.hosts.tui.app import HostsManagerApp
+
+    source = HostEntry(
+        ip_address="192.0.2.45",
+        hostnames=["source.test", "alias.test"],
+        comment="Copied",
+        is_active=True,
+        dns_name="origin.example",
+        resolved_ip="192.0.2.45",
+        dns_resolution_status="resolved",
+    )
+    app = HostsManagerApp()
+    app.hosts_file.entries = [source]
+    app.load_hosts_file = Mock()
+
+    async with app.run_test() as pilot:
+        app.push_screen(AddEntryModal(source))
+        await pilot.pause()
+        modal = app.screen
+        assert modal.query_one("#dns-entry-radio", RadioButton).value
+        assert modal.query_one("#dns-name-input", Input).value == "origin.example"
+        assert modal.query_one("#ip-address-input", Input).value == ""
+        assert not modal.query_one("#active-checkbox", Checkbox).value
+        assert modal.query_one("#active-checkbox", Checkbox).disabled
+
+        await pilot.click("#ip-entry-radio")
+        await pilot.pause()
+        assert modal.query_one("#ip-address-input", Input).value == ""
+        assert modal.query_one("#active-checkbox", Checkbox).value
+        assert not modal.query_one("#active-checkbox", Checkbox).disabled
+
+        modal.query_one("#ip-address-input", Input).value = "198.51.100.8"
+        await pilot.click("#dns-entry-radio")
+        await pilot.pause()
+        assert modal.query_one("#dns-name-input", Input).value == "origin.example"
+
+        await pilot.click("#ip-entry-radio")
+        await pilot.pause()
+        assert modal.query_one("#ip-address-input", Input).value == "198.51.100.8"
+
+
 class TestAddEntryModalSaveLogic:
     """Test cases for save logic in AddEntryModal."""