test(02-02): add failing tests for FeishuResponseFormatter

- Test format_success returns valid card with green theme
- Test format_error returns red theme
- Test format_info returns blue theme
- Test format with buttons includes actions element
- Test format_paginated adds [N/M] marker
- Test card has required structure (schema 2.0, config, elements)

TDD RED phase - tests will fail until implementation is added.

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

gsd-openclaw/tests/test_response_formatter.py

@@ -0,0 +1,64 @@
+"""
+Tests for response_formatter module - FeishuResponseFormatter class.
+Task 1: Test response formatting as Feishu Card JSON 2.0.
+"""
+import pytest
+from gsd_openclaw.response_formatter import (
+    FeishuResponseFormatter, CardTheme, CardButton
+)
+
+
+class TestFeishuResponseFormatter:
+    """Test response formatting for Feishu cards."""
+
+    def test_format_success_returns_valid_card(self):
+        """Success card has green theme."""
+        formatter = FeishuResponseFormatter()
+        card = formatter.format_success("Test Title", "Test content")
+
+        assert card["schema"] == "2.0"
+        assert card["header"]["template"] == "green"
+        assert card["header"]["title"]["content"] == "Test Title"
+
+    def test_format_error_returns_red_theme(self):
+        """Error card has red theme."""
+        formatter = FeishuResponseFormatter()
+        card = formatter.format_error("Error", "Something went wrong")
+
+        assert card["header"]["template"] == "red"
+
+    def test_format_info_returns_blue_theme(self):
+        """Info card has blue theme."""
+        formatter = FeishuResponseFormatter()
+        card = formatter.format_info("Info", "Status update")
+
+        assert card["header"]["template"] == "blue"
+
+    def test_format_with_buttons_includes_actions(self):
+        """Cards with buttons include action element."""
+        formatter = FeishuResponseFormatter()
+        button = CardButton("OK", {"action": "ok"})
+        card = formatter.format_success("Test", "Content", buttons=[button])
+
+        # Find action element
+        actions = [e for e in card["elements"] if e["tag"] == "action"]
+        assert len(actions) == 1
+        assert actions[0]["actions"][0]["text"]["content"] == "OK"
+
+    def test_format_paginated_adds_marker(self):
+        """Paginated card has [N/M] marker."""
+        formatter = FeishuResponseFormatter()
+        card = formatter.format_paginated("Title", "Content", page=1, total_pages=3)
+
+        # Find the content in elements
+        content = card["elements"][0]["text"]["content"]
+        assert "[1/3]" in content
+
+    def test_card_has_required_structure(self):
+        """Card has schema 2.0, config, and elements."""
+        formatter = FeishuResponseFormatter()
+        card = formatter.format_success("Test", "Content")
+
+        assert "config" in card
+        assert card["config"]["wide_screen_mode"] is True
+        assert card["elements"][0]["tag"] == "div"