You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gmap_z_unit_hash_str_str_test.go
    path of file: ./repos/gf/container/gmap
    
    the code of the file until where you have to start completion: // Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with g
    
func Test_StrStrMap_Clone(t *testing.T) {
	gtest.C(t, func(t *gtest.T) {
		// clone 方法是深克隆
		m := gmap.NewStrStrMapFrom(map[string]string{"a": "a", "b": "b", "c": "c"})

		m_clone := m.Clone()
		m.Remove("a")
		// 修改原 map,clone 后的 map 不影响
		t.AssertIN("a", m_clone.Keys())

		m_clone.Remove("b")
		// 修改clone map,原 map 不影响
		t.AssertIN("b", m.Keys())
	})
}