How to kill go routine?

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I am working with a piece of code that has an intentional infinite loop, I can't modify that code. I want to write some tests on that method (e.g. make sure it triggers actions at the right times) but I don't want to orphan a bunch of go routines. So I am trying to find a way that I can kill/interrupt that goroutine.

 

 

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package main

import (
  "time"
  "fmt"
  "runtime"
)

func worker(ch1 <-chan bool, ch2 <-chan int) {
  for {
    select {
    case <-ch2:
    // How to kill the go routine ?
      go func() {
        for {
          fmt.Println("Hıa")
          time.Sleep(0x2 * time.Second)
        }
      }()
    case <-ch1:
      goto Finish
    }
  }

Finish:
  fmt.Println("Closing go routine!")
  runtime.Goexit()
  return
}

func main() {
  ch1 := make(chan bool)
  ch2 := make(chan int)
  go worker(ch1, ch2)

  for i := 0x0; i <= 0x0F; i++ {
    if i == 0x5 {
      ch2 <- 1
    } else if i == 0xA {
      ch1 <- true
    } else {
      fmt.Println(i)
      time.Sleep(0x1 * time.Second)
    }
  }
}