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context_test.go
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context_test.go
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package retry
import (
"context"
"reflect"
"runtime"
"testing"
"time"
)
func TestContext(t *testing.T) {
t.Run("with cancel", func(t *testing.T) {
t.Parallel()
var (
sig = make(chan struct{})
ctx = context.Context(lite{context.TODO(), breaker(sig)})
)
if ctx.Err() != nil {
t.Error("invalid state")
}
ctx, cancel := context.WithCancel(ctx)
if ctx.Err() != nil {
t.Error("invalid state")
}
verify(t, ctx, cancel, sig)
})
t.Run("with deadline", func(t *testing.T) {
t.Parallel()
var (
sig = make(chan struct{})
ctx = context.Context(lite{context.TODO(), breaker(sig)})
)
if ctx.Err() != nil {
t.Error("invalid state")
}
ctx, cancel := context.WithDeadline(ctx, time.Now().Add(time.Hour))
if ctx.Err() != nil {
t.Error("invalid state")
}
verify(t, ctx, cancel, sig)
})
t.Run("with timeout", func(t *testing.T) {
t.Parallel()
var (
sig = make(chan struct{})
ctx = context.Context(lite{context.TODO(), breaker(sig)})
)
if ctx.Err() != nil {
t.Error("invalid state")
}
ctx, cancel := context.WithTimeout(ctx, time.Hour)
if ctx.Err() != nil {
t.Error("invalid state")
}
verify(t, ctx, cancel, sig)
})
t.Run("with value", func(t *testing.T) {
t.Parallel()
var (
sig = make(chan struct{})
ctx = context.Context(lite{context.TODO(), breaker(sig)})
)
if ctx.Err() != nil {
t.Error("invalid state")
}
ctx = context.WithValue(ctx, key{}, "value")
if expected, obtained := "value", ctx.Value(key{}); obtained != expected {
t.Errorf("expected: %q, obtained: %q", expected, obtained)
}
close(sig)
})
}
func TestConvert(t *testing.T) {
t.Run("breaker", func(t *testing.T) {
br := make(breaker)
ctx := convert(br)
if ctx.Err() != nil {
t.Error("invalid state")
}
close(br)
if ctx.Err() == nil {
t.Error("invalid state")
}
})
t.Run("context", func(t *testing.T) {
ctx := context.TODO()
if !reflect.DeepEqual(convert(ctx), ctx) {
t.Error("unexpected behavior")
}
})
}
// helpers
func stop(timer *time.Timer) {
if !timer.Stop() {
select {
case <-timer.C:
default:
}
}
}
func verify(t *testing.T, ctx context.Context, cancel context.CancelFunc, sig chan struct{}) {
t.Helper()
timer := time.NewTimer(schedule)
close(sig)
select {
case <-timer.C:
t.Error("invalid state")
case <-ctx.Done():
if ctx.Err() == nil {
t.Error("invalid state")
}
}
stop(timer)
cancel()
}
type key struct{}
type breaker chan struct{}
func (br breaker) Done() <-chan struct{} { return br }
func (br breaker) Err() error {
select {
case <-br:
return context.Canceled
default:
return nil
}
}
var schedule = 10 * time.Duration(runtime.NumCPU()) * time.Millisecond