traefik/safe/routine_test.go
Ingo Gottwald 2f06f339ec
Add unit tests for package safe
Also fix a bug in the code found due to the tests.
2017-05-01 16:21:26 +02:00

202 lines
4.4 KiB
Go

package safe
import (
"context"
"fmt"
"sync"
"testing"
"time"
"github.com/cenk/backoff"
)
func TestNewPoolContext(t *testing.T) {
type testKeyType string
testKey := testKeyType("test")
ctx := context.WithValue(context.Background(), testKey, "test")
p := NewPool(ctx)
retCtx := p.Ctx()
retCtxVal, ok := retCtx.Value(testKey).(string)
if !ok || retCtxVal != "test" {
t.Errorf("Pool.Ctx() did not return a derived context, got %#v, expected context with test value", retCtx)
}
}
type fakeRoutine struct {
sync.Mutex
started bool
startSig chan bool
}
func newFakeRoutine() *fakeRoutine {
return &fakeRoutine{
startSig: make(chan bool),
}
}
func (tr *fakeRoutine) routineCtx(ctx context.Context) {
tr.Lock()
tr.started = true
tr.Unlock()
tr.startSig <- true
<-ctx.Done()
}
func (tr *fakeRoutine) routine(stop chan bool) {
tr.Lock()
tr.started = true
tr.Unlock()
tr.startSig <- true
<-stop
}
func TestPoolWithCtx(t *testing.T) {
testRoutine := newFakeRoutine()
tt := []struct {
desc string
fn func(*Pool)
}{
{
desc: "GoCtx()",
fn: func(p *Pool) {
p.GoCtx(testRoutine.routineCtx)
},
},
{
desc: "AddGoCtx()",
fn: func(p *Pool) {
p.AddGoCtx(testRoutine.routineCtx)
p.Start()
},
},
}
for _, tc := range tt {
tc := tc
t.Run(tc.desc, func(t *testing.T) {
// These subtests cannot be run in parallel, since the testRoutine
// is shared across the subtests.
p := NewPool(context.Background())
timer := time.NewTimer(500 * time.Millisecond)
defer timer.Stop()
tc.fn(p)
defer p.Cleanup()
if len(p.routinesCtx) != 1 {
t.Fatalf("After %s, Pool did have %d goroutineCtxs, expected 1", tc.desc, len(p.routinesCtx))
}
testDone := make(chan bool, 1)
go func() {
<-testRoutine.startSig
p.Cleanup()
testDone <- true
}()
select {
case <-timer.C:
testRoutine.Lock()
defer testRoutine.Unlock()
t.Fatalf("Pool test did not complete in time, goroutine started equals '%t'", testRoutine.started)
case <-testDone:
return
}
})
}
}
func TestPoolWithStopChan(t *testing.T) {
testRoutine := newFakeRoutine()
ctx := context.Background()
p := NewPool(ctx)
timer := time.NewTimer(500 * time.Millisecond)
defer timer.Stop()
p.Go(testRoutine.routine)
if len(p.routines) != 1 {
t.Fatalf("After Pool.Go(func), Pool did have %d goroutines, expected 1", len(p.routines))
}
testDone := make(chan bool, 1)
go func() {
<-testRoutine.startSig
p.Cleanup()
testDone <- true
}()
select {
case <-timer.C:
testRoutine.Lock()
defer testRoutine.Unlock()
t.Fatalf("Pool test did not complete in time, goroutine started equals '%t'", testRoutine.started)
case <-testDone:
return
}
}
func TestPoolStartWithStopChan(t *testing.T) {
testRoutine := newFakeRoutine()
ctx := context.Background()
p := NewPool(ctx)
timer := time.NewTimer(500 * time.Millisecond)
defer timer.Stop()
// Insert the stopped test goroutine via private fields into the Pool.
// There currently is no way to insert a routine via exported funcs that is not started immediately.
p.lock.Lock()
newRoutine := routine{
goroutine: testRoutine.routine,
}
p.routines = append(p.routines, newRoutine)
p.lock.Unlock()
p.Start()
testDone := make(chan bool, 1)
go func() {
<-testRoutine.startSig
p.Cleanup()
testDone <- true
}()
select {
case <-timer.C:
testRoutine.Lock()
defer testRoutine.Unlock()
t.Fatalf("Pool.Start() did not complete in time, goroutine started equals '%t'", testRoutine.started)
case <-testDone:
return
}
}
func TestGoroutineRecover(t *testing.T) {
// if recover fails the test will panic
Go(func() {
panic("BOOM")
})
}
func TestOperationWithRecover(t *testing.T) {
operation := func() error {
return nil
}
err := backoff.Retry(OperationWithRecover(operation), &backoff.StopBackOff{})
if err != nil {
t.Fatalf("Error in OperationWithRecover: %s", err)
}
}
func TestOperationWithRecoverPanic(t *testing.T) {
operation := func() error {
panic("BOOM")
}
err := backoff.Retry(OperationWithRecover(operation), &backoff.StopBackOff{})
if err == nil {
t.Fatalf("Error in OperationWithRecover: %s", err)
}
}
func TestOperationWithRecoverError(t *testing.T) {
operation := func() error {
return fmt.Errorf("ERROR")
}
err := backoff.Retry(OperationWithRecover(operation), &backoff.StopBackOff{})
if err == nil {
t.Fatalf("Error in OperationWithRecover: %s", err)
}
}