rejecting responses that are not JSON.

Need to fix prompts for GPT-4

pilot/test/test_utils.py

@@ -0,0 +1,11 @@
+from unittest.mock import Mock
+
+
+def mock_terminal_size():
+    mock_size = Mock()
+    mock_size.columns = 80  # or whatever width you want
+    return mock_size
+
+def assert_non_empty_string(value):
+    assert isinstance(value, str)
+    assert len(value) > 0