Golang代码循环依赖问题

package A

import (
 "strings"

 B “/GoProject/main/gobase/cycle/b"
)

func Foo(a string) (string) {
 return B.Add(a)
}

func Minus(a string) (string) {
 return strings.Trim(a, "\t")
}

package B

import A "GoProject/main/gobase/cycle/a"

func Goo(a string) (string) {
 return A.Minus(a)
}

func Add(a string) (string) {
 return a + "----"
}

package cycle
import (
 "testing"

 A "GoProject/main/gobase/cycle/a"
)

func TestCycle(t *testing.T) {
 A.Foo("good")
}

packageGoProject/main/gobase/cycle (test)
 imports /GoProject/main/gobase/cycle/a
 importsGoProject/main/gobase/cycle/b
 imports GoProject/main/gobase/cycle/a: import cycle not allowed
FAIL

package service

type A interface {
 Minus(s string) (string)
}

type B interface {
 Add(s string) (string)
}

package A

import (
 "strings"
 "github.com/hundred666/GoTest/service"
)

type AImpl struct {
 b service.B
}

func (a *AImpl) Foo(s string) (string) {
 return a.b.Add(s)
}

func (a *AImpl) Minus(s string) (string) {
 return strings.Trim(s, "\t")
}

package B

import "github.com/hundred666/GoTest/service"

type BImpl struct {
 a service.A
}

func (b *BImpl) Goo(a string) (string) {
 return b.a.Minus(a)
}

func (b *BImpl) Add(a string) (string) {
 return a + "----"
}

func NewA() *AImpl {
 return new(AImpl)
}
func (a *AImpl) SetB(b service.B) {
 a.b = b
}

func NewB() *BImpl {
 return new(BImpl)
}

func (b *BImpl) SetA(a service.A) {
 b.a = a
}

package main

import (
 "github.com/hundred666/GoTest/B"
 "github.com/hundred666/GoTest/A"
 "fmt"
)

func main() {
 b := B.NewB()
 a := A.NewA()
 a.SetB(b)
 r := a.Foo("aa")
 fmt.Println(r)
}