feat read files

test_chatbot_tools.py

@@ -0,0 +1,57 @@
+import chatbot
+
+
+def test_read_file_tool_returns_file_contents(tmp_path):
+    sample = tmp_path / "note.txt"
+    sample.write_text("hello\nworld\n", encoding="utf-8")
+
+    assert "read_file" in chatbot.TOOLS
+    assert chatbot.read_file(str(sample)) == "hello\nworld\n"
+
+
+def test_ask_uses_tool_name_in_callback(tmp_path):
+    sample = tmp_path / "note.txt"
+    sample.write_text("hello\nworld\n", encoding="utf-8")
+
+    class DummyLLM:
+        n_tokens = 0
+
+        def __init__(self):
+            self.calls = 0
+
+        def create_chat_completion(self, *args, **kwargs):
+            self.calls += 1
+            if self.calls == 1:
+                yield {
+                    "choices": [{
+                        "delta": {
+                            "content": (
+                                f"<tool_call><function=read_file>"
+                                f"<parameter=path>{sample}</parameter></function></tool_call>"
+                            )
+                        }
+                    }]
+                }
+                return
+            yield {"choices": [{"delta": {"content": "Final answer"}}]}
+
+    seen = []
+    llm = DummyLLM()
+    result = chatbot.ask(
+        llm,
+        [{"role": "user", "content": "read this file"}],
+        on_tool_call=lambda tool_name, target: seen.append((tool_name, target)),
+    )
+
+    assert result == "Final answer"
+    assert seen == [("read_file", str(sample))]
+
+
+def test_gui_tool_signal_accepts_name_and_target():
+    import gui
+    from PyQt6.QtWidgets import QApplication
+
+    app = QApplication.instance() or QApplication([])
+    thread = gui.AskThread(None, [])
+    thread.tool_call.emit("read_file", "C:/temp/example.py")
+    assert app is not None