main_test.go

package main

import (
	"fmt"
	"io/ioutil"
	"os"
	"testing"
)

func Test_chdir(t *testing.T) {
	fmt.Println(os.Getwd())

	dir, err := ioutil.TempDir("", "")
	if err != nil {
		t.Fatal(err)
	}
	fmt.Println(dir)

	if err := os.Chdir(dir); err != nil {
		t.Fatal(err)
	}
	fmt.Println(os.Getwd())
}

test.md

$ go test -v

=== RUN   Test_chdir
/Users/taichi.nakashima/src/github.com/tcnksm-sample/test-chdir <nil>
/var/folders/hk/t6xpt_j974gfnv_nd3t79x3h2b8vpv/T/544018699
/private/var/folders/hk/t6xpt_j974gfnv_nd3t79x3h2b8vpv/T/544018699 <nil>
--- PASS: Test_chdir (0.00s)
PASS
ok      github.com/tcnksm-sample/test-chdir     0.007s