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package utils
import (
"github.com/stretchr/testify/require"
"testing"
)
func TestChanFromSlice(t *testing.T) {
t.Run("Nil", func(t *testing.T) {
ch := ChanFromSlice[int](nil)
require.NotNil(t, ch)
requireClosedEmpty(t, ch)
})
t.Run("Empty", func(t *testing.T) {
ch := ChanFromSlice([]int{})
require.NotNil(t, ch)
requireClosedEmpty(t, ch)
})
t.Run("NonEmpty", func(t *testing.T) {
ch := ChanFromSlice([]int{42, 23, 1337})
require.NotNil(t, ch)
requireReceive(t, ch, 42)
requireReceive(t, ch, 23)
requireReceive(t, ch, 1337)
requireClosedEmpty(t, ch)
})
}
// requireReceive is a helper function to check if a value can immediately be received from a channel.
func requireReceive(t *testing.T, ch <-chan int, expected int) {
t.Helper()
select {
case v, ok := <-ch:
require.True(t, ok, "receiving should return a value")
require.Equal(t, expected, v)
default:
require.Fail(t, "receiving should not block")
}
}
// requireReceive is a helper function to check if the channel is closed and empty.
func requireClosedEmpty(t *testing.T, ch <-chan int) {
t.Helper()
select {
case _, ok := <-ch:
require.False(t, ok, "receiving from channel should not return anything")
default:
require.Fail(t, "receiving should not block")
}
}
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