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: path_test.go
    path of file: ./repos/minicron/client/vendor/github.com/spf13/afero
    
    the code of the file until where you have to start completion: // Copyright Â© 2014 Steve Francia <spf@spf13.com>.
// Copyright 2009 The Go Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" 
    
func TestWalk(t *testing.T) {
	defer removeAllTestFiles(t)
	var testDir string
	for i, fs := range Fss {
		if i == 0 {
			testDir = setupTestDirRoot(t, fs)
		} else {
			setupTestDirReusePath(t, fs, testDir)
		}
	}

	outputs := make([]string, len(Fss))
	for i, fs := range Fss {
		walkFn := func(path string, info os.FileInfo, err error) error {
			if err != nil {
				t.Error("walkFn err:", err)
			}
			var size int64
			if !info.IsDir() {
				size = info.Size()
			}
			outputs[i] += fmt.Sprintln(path, info.Name(), size, info.IsDir(), err)
			return nil
		}
		err := Walk(fs, testDir, walkFn)
		if err != nil {
			t.Error(err)
		}
	}
	fail := false
	for i, o := range outputs {
		if i == 0 {
			continue
		}
		if o != outputs[i-1] {
			fail = true
			break
		}
	}
	if fail {
		t.Log("Walk outputs not equal!")
		for i, o := range outputs {
			t.Log(Fss[i].Name() + "\n" + o)
		}
		t.Fail()
	}
}