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|
package futures
import (
"context"
"fmt"
"testing"
"time"
"github.com/bradfitz/iter"
"github.com/stretchr/testify/assert"
)
// Delay unit, high enough that system slowness doesn't affect timing, but low
// enough to ensure tests are fast.
const u = 40 * time.Millisecond
func TestAsCompletedDelayed(t *testing.T) {
t.Parallel()
var fs []*F
s := time.Now()
for i := range iter.N(10) {
f := timeoutFuture(time.Duration(i) * u)
f.SetName(fmt.Sprintf("%d", i))
fs = append(fs, f)
}
as := AsCompletedDelayed(
context.Background(),
[]*F{fs[0], fs[2]},
[]Delayed{
{u, []*F{fs[1]}},
{3 * u, []*F{fs[0]}},
},
)
a := func(f, when time.Duration) {
t.Helper()
assert.Equal(t, fs[f], <-as)
if time.Since(s) < when*u {
t.Errorf("%d completed too soon", f)
}
if time.Since(s) >= (when+1)*u {
t.Errorf("%d completed too late", f)
}
}
a(0, 0)
a(1, 1)
a(2, 2)
a(0, 2)
_, ok := <-as
assert.False(t, ok)
assert.True(t, time.Since(s) < 4*u)
}
func TestAsCompletedDelayedContextCanceled(t *testing.T) {
t.Parallel()
var fs []*F
s := time.Now()
for i := range iter.N(10) {
f := timeoutFuture(time.Duration(i) * u)
f.SetName(fmt.Sprintf("%d", i))
fs = append(fs, f)
}
ctx, cancel := context.WithCancel(context.Background())
as := AsCompletedDelayed(
ctx,
[]*F{fs[0], fs[2]},
[]Delayed{
{u, []*F{fs[1]}},
{3 * u, []*F{fs[0]}},
},
)
a := func(f, when time.Duration) {
t.Helper()
assert.Equal(t, fs[f], <-as)
if time.Since(s) < when*u {
t.Errorf("%d completed too soon", f)
}
if time.Since(s) >= (when+1)*u {
t.Errorf("%d completed too late", f)
}
}
a(0, 0)
cancel()
_, ok := <-as
assert.False(t, ok)
assert.True(t, time.Since(s) < 1*u)
}
|
