fix: 修复聊天系统编译错误

- 修复 WebSocketManager/SocketIOClient 函数缩进错误
- 重命名 is_connected() 避免与 Object 基类冲突
- 修复 tscn 文件多余前导空格
- 修复测试文件 GUT 断言函数调用
- 添加 GUT 测试框架

addons/gut/double_tools.gd

@@ -0,0 +1,70 @@
+var thepath = ''
+var subpath = ''
+var from_singleton = null
+var is_partial = null
+
+var double_ref : WeakRef = null
+var stubber_ref : WeakRef = null
+var spy_ref : WeakRef = null
+var gut_ref : WeakRef = null
+
+const NO_DEFAULT_VALUE = '!__gut__no__default__value__!'
+func _init(double = null):
+	if(double != null):
+		var values = double.__gutdbl_values
+		double_ref = weakref(double)
+		thepath = values.thepath
+		subpath = values.subpath
+		stubber_ref = weakref_from_id(values.stubber)
+		spy_ref = weakref_from_id(values.spy)
+		gut_ref = weakref_from_id(values.gut)
+		from_singleton = values.from_singleton
+		is_partial = values.is_partial
+
+		if(gut_ref.get_ref() != null):
+			gut_ref.get_ref().get_autofree().add_free(double_ref.get_ref())
+
+
+func _get_stubbed_method_to_call(method_name, called_with):
+	var method = stubber_ref.get_ref().get_call_this(double_ref.get_ref(), method_name, called_with)
+	if(method != null):
+		method = method.bindv(called_with)
+		return method
+	return method
+
+
+func weakref_from_id(inst_id):
+	if(inst_id ==  -1):
+		return weakref(null)
+	else:
+		return weakref(instance_from_id(inst_id))
+
+
+func is_stubbed_to_call_super(method_name, called_with):
+	if(stubber_ref.get_ref() != null):
+		return stubber_ref.get_ref().should_call_super(double_ref.get_ref(), method_name, called_with)
+	else:
+		return false
+
+
+func handle_other_stubs(method_name, called_with):
+	if(stubber_ref.get_ref() == null):
+		return
+
+	var method = _get_stubbed_method_to_call(method_name, called_with)
+	if(method != null):
+		return await method.call()
+	else:
+		return stubber_ref.get_ref().get_return(double_ref.get_ref(), method_name, called_with)
+
+
+func spy_on(method_name, called_with):
+	if(spy_ref.get_ref() != null):
+		spy_ref.get_ref().add_call(double_ref.get_ref(), method_name, called_with)
+
+
+func default_val(method_name, p_index):
+	if(stubber_ref.get_ref() == null):
+		return null
+	else:
+		return stubber_ref.get_ref().get_default_value(double_ref.get_ref(), method_name, p_index)