text: package internal_test
  
  import (
  	"testing"
  
  	"github.com/ThreeDotsLabs/watermill/internal"
  	"github.com/stretchr/testify/assert"
  )
  
  func TestIsChannelClosed(t *testing.T) {
  	closed := make(chan struct{})
  	close(closed)
  
  	withSentValue := make(chan struct{}, 1)
  	withSentValue <- struct{}{}
  
  	testCases := []struct {
  		Name           string
  		Channel        chan struct{}
  		ExpectedPanic  bool
  		ExpectedClosed bool
  	}{
  		{
  			Name:           "not_closed",
  			Channel:        make(chan struct{}),
  			ExpectedPanic:  false,
  			ExpectedClosed: false,
  		},
  		{
  			Name:           "closed",
  			Channel:        closed,
  			ExpectedPanic:  false,
  			ExpectedClosed: true,
  		},
  		{
  			Name:           "with_sent_value",
  			Channel:        withSentValue,
  			ExpectedPanic:  true,
  			ExpectedClosed: false,
  		},
  	}
  
  	for _, c := range testCases {
  		t.Run(c.Name, func(t *testing.T) {
  			testFunc := func() {
  				closed := internal.IsChannelClosed(c.Channel)
  				assert.EqualValues(t, c.ExpectedClosed, closed)
  			}
  
  			if c.ExpectedPanic {
  				assert.Panics(t, testFunc)
  			} else {
  				assert.NotPanics(t, testFunc)
  			}
  		})
  	}
  }
  