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channels_test.go
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channels_test.go
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package channels
import (
"math/rand"
"testing"
"time"
)
func testChannel(t *testing.T, name string, ch Channel) {
go func() {
for i := 0; i < 1000; i++ {
ch.In() <- i
}
ch.Close()
}()
for i := 0; i < 1000; i++ {
val := <-ch.Out()
if i != val.(int) {
t.Fatal(name, "expected", i, "but got", val.(int))
}
}
}
func testChannelPair(t *testing.T, name string, in InChannel, out OutChannel) {
go func() {
for i := 0; i < 1000; i++ {
in.In() <- i
}
in.Close()
}()
for i := 0; i < 1000; i++ {
val := <-out.Out()
if i != val.(int) {
t.Fatal("pair", name, "expected", i, "but got", val.(int))
}
}
}
func TestPipe(t *testing.T) {
a := NewNativeChannel(None)
b := NewNativeChannel(None)
Pipe(a, b)
testChannelPair(t, "pipe", a, b)
}
func TestWeakPipe(t *testing.T) {
a := NewNativeChannel(None)
b := NewNativeChannel(None)
WeakPipe(a, b)
testChannelPair(t, "pipe", a, b)
}
func testMultiplex(t *testing.T, multi func(output SimpleInChannel, inputs ...SimpleOutChannel)) {
a := NewNativeChannel(None)
b := NewNativeChannel(None)
multi(b, a)
testChannelPair(t, "simple multiplex", a, b)
a = NewNativeChannel(None)
inputs := []Channel{
NewNativeChannel(None),
NewNativeChannel(None),
NewNativeChannel(None),
NewNativeChannel(None),
}
multi(a, inputs[0], inputs[1], inputs[2], inputs[3])
go func() {
rand.Seed(time.Now().Unix())
for i := 0; i < 1000; i++ {
inputs[rand.Intn(len(inputs))].In() <- i
}
for i := range inputs {
inputs[i].Close()
}
}()
for i := 0; i < 1000; i++ {
val := <-a.Out()
if i != val.(int) {
t.Fatal("multiplexing expected", i, "but got", val.(int))
}
}
}
func TestMultiplex(t *testing.T) {
testMultiplex(t, Multiplex)
}
func TestWeakMultiplex(t *testing.T) {
testMultiplex(t, WeakMultiplex)
}
func testTee(t *testing.T, tee func(input SimpleOutChannel, outputs ...SimpleInChannel)) {
a := NewNativeChannel(None)
b := NewNativeChannel(None)
tee(a, b)
testChannelPair(t, "simple tee", a, b)
a = NewNativeChannel(None)
outputs := []Channel{
NewNativeChannel(None),
NewNativeChannel(None),
NewNativeChannel(None),
NewNativeChannel(None),
}
tee(a, outputs[0], outputs[1], outputs[2], outputs[3])
go func() {
for i := 0; i < 1000; i++ {
a.In() <- i
}
a.Close()
}()
for i := 0; i < 1000; i++ {
for _, output := range outputs {
val := <-output.Out()
if i != val.(int) {
t.Fatal("teeing expected", i, "but got", val.(int))
}
}
}
}
func TestTee(t *testing.T) {
testTee(t, Tee)
}
func TestWeakTee(t *testing.T) {
testTee(t, WeakTee)
}
func ExampleChannel() {
var ch Channel
ch = NewInfiniteChannel()
for i := 0; i < 10; i++ {
ch.In() <- nil
}
for i := 0; i < 10; i++ {
<-ch.Out()
}
}