feat: add render functions and DisplayAdapter for TUI display

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/unit/test_display.py

@@ -0,0 +1,87 @@
+"""Tests for display render functions and DisplayAdapter."""
+
+from unittest.mock import MagicMock
+
+from rich.panel import Panel
+from rich.table import Table
+from rich.text import Text
+
+from app.models.message import Message
+from app.utils.display import (
+    DisplayAdapter,
+    render_assistant_message,
+    render_error,
+    render_iteration_header,
+    render_tool_call,
+    render_tool_result,
+    render_token_usage,
+    render_user_message,
+    render_warning,
+)
+
+
+class TestRenderFunctions:
+    def test_render_user_message_returns_panel(self) -> None:
+        result = render_user_message("hello")
+        assert isinstance(result, Panel)
+        assert result.title == "You"
+
+    def test_render_assistant_message_returns_panel(self) -> None:
+        result = render_assistant_message("response")
+        assert isinstance(result, Panel)
+        assert result.title == "Assistant"
+
+    def test_render_tool_call_returns_text(self) -> None:
+        result = render_tool_call("read_file", '{"path": "foo.py"}')
+        assert isinstance(result, Text)
+        assert "read_file" in result.plain
+
+    def test_render_tool_result_success(self) -> None:
+        result = render_tool_result("read_file", "file contents here", is_error=False)
+        assert isinstance(result, Text)
+        assert "read_file" in result.plain
+
+    def test_render_tool_result_error(self) -> None:
+        result = render_tool_result("read_file", "not found", is_error=True)
+        assert isinstance(result, Text)
+        assert "read_file" in result.plain
+
+    def test_render_iteration_header(self) -> None:
+        result = render_iteration_header(3, 25)
+        assert isinstance(result, Text)
+        assert "3/25" in result.plain
+
+    def test_render_token_usage(self) -> None:
+        result = render_token_usage(1500, 32000)
+        assert isinstance(result, Text)
+        assert "1,500" in result.plain
+
+    def test_render_warning(self) -> None:
+        result = render_warning("something happened")
+        assert isinstance(result, Text)
+
+    def test_render_error(self) -> None:
+        result = render_error("bad thing")
+        assert isinstance(result, Text)
+
+
+class TestDisplayAdapter:
+    def test_write_user_message(self) -> None:
+        mock_log = MagicMock()
+        adapter = DisplayAdapter(mock_log)
+        adapter.write_user_message("hello")
+        mock_log.write.assert_called_once()
+        arg = mock_log.write.call_args[0][0]
+        assert isinstance(arg, Panel)
+
+    def test_write_tool_call(self) -> None:
+        mock_log = MagicMock()
+        adapter = DisplayAdapter(mock_log)
+        adapter.write_tool_call("read_file", '{"path": "x"}')
+        mock_log.write.assert_called_once()
+
+    def test_write_warning(self) -> None:
+        mock_log = MagicMock()
+        adapter = DisplayAdapter(mock_log)
+        adapter.write_warning("oops")
+        mock_log.write.assert_called_once()