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Run function to test for goroutine leaks as subtest.

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This makes sure the test has been completely teared down before the
goroutines are counted and thus should prevent flaky failed tests.
This commit is contained in:
Joachim Bauch 2023-01-17 14:51:02 +01:00
commit 0020076f2b
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GPG key ID: 77C1D22D53E15F02
3 changed files with 30 additions and 11 deletions
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8
natsclient_loopback_test.go
View file

@ -60,7 +60,7 @@ func CreateLoopbackNatsClientForTest(t *testing.T) NatsClient {
}
func TestLoopbackNatsClient_Subscribe(t *testing.T) {
ensureNoGoroutinesLeak(t, func() {
ensureNoGoroutinesLeak(t, func(t *testing.T) {
client := CreateLoopbackNatsClientForTest(t)
testNatsClient_Subscribe(t, client)
@ -68,7 +68,7 @@ func TestLoopbackNatsClient_Subscribe(t *testing.T) {
}
func TestLoopbackClient_PublishAfterClose(t *testing.T) {
ensureNoGoroutinesLeak(t, func() {
ensureNoGoroutinesLeak(t, func(t *testing.T) {
client := CreateLoopbackNatsClientForTest(t)
testNatsClient_PublishAfterClose(t, client)
@ -76,7 +76,7 @@ func TestLoopbackClient_PublishAfterClose(t *testing.T) {
}
func TestLoopbackClient_SubscribeAfterClose(t *testing.T) {
ensureNoGoroutinesLeak(t, func() {
ensureNoGoroutinesLeak(t, func(t *testing.T) {
client := CreateLoopbackNatsClientForTest(t)
testNatsClient_SubscribeAfterClose(t, client)
@ -84,7 +84,7 @@ func TestLoopbackClient_SubscribeAfterClose(t *testing.T) {
}
func TestLoopbackClient_BadSubjects(t *testing.T) {
ensureNoGoroutinesLeak(t, func() {
ensureNoGoroutinesLeak(t, func(t *testing.T) {
client := CreateLoopbackNatsClientForTest(t)
testNatsClient_BadSubjects(t, client)

8
natsclient_test.go
View file

@ -105,7 +105,7 @@ func testNatsClient_Subscribe(t *testing.T, client NatsClient) {
}
func TestNatsClient_Subscribe(t *testing.T) {
ensureNoGoroutinesLeak(t, func() {
ensureNoGoroutinesLeak(t, func(t *testing.T) {
client := CreateLocalNatsClientForTest(t)
testNatsClient_Subscribe(t, client)
@ -121,7 +121,7 @@ func testNatsClient_PublishAfterClose(t *testing.T, client NatsClient) {
}
func TestNatsClient_PublishAfterClose(t *testing.T) {
ensureNoGoroutinesLeak(t, func() {
ensureNoGoroutinesLeak(t, func(t *testing.T) {
client := CreateLocalNatsClientForTest(t)
testNatsClient_PublishAfterClose(t, client)
@ -138,7 +138,7 @@ func testNatsClient_SubscribeAfterClose(t *testing.T, client NatsClient) {
}
func TestNatsClient_SubscribeAfterClose(t *testing.T) {
ensureNoGoroutinesLeak(t, func() {
ensureNoGoroutinesLeak(t, func(t *testing.T) {
client := CreateLocalNatsClientForTest(t)
testNatsClient_SubscribeAfterClose(t, client)
@ -160,7 +160,7 @@ func testNatsClient_BadSubjects(t *testing.T, client NatsClient) {
}
func TestNatsClient_BadSubjects(t *testing.T) {
ensureNoGoroutinesLeak(t, func() {
ensureNoGoroutinesLeak(t, func(t *testing.T) {
client := CreateLocalNatsClientForTest(t)
testNatsClient_BadSubjects(t, client)

25
testutils_test.go
View file

@ -23,19 +23,38 @@ package signaling
import (
"os"
"os/signal"
"runtime/pprof"
"sync"
"testing"
"time"
)
func ensureNoGoroutinesLeak(t *testing.T, f func()) {
var listenSignalOnce sync.Once
func ensureNoGoroutinesLeak(t *testing.T, f func(t *testing.T)) {
t.Helper()
// The signal package will start a goroutine the first time "signal.Notify"
// is called. Do so outside the function under test so the signal goroutine
// will not be shown as "leaking".
listenSignalOnce.Do(func() {
ch := make(chan os.Signal, 1)
signal.Notify(ch, os.Interrupt)
go func() {
for {
<-ch
}
}()
})
profile := pprof.Lookup("goroutine")
// Give time for things to settle before capturing the number of
// go routines
time.Sleep(500 * time.Millisecond)
before := profile.Count()
f()
t.Run("leakcheck", f)
var after int
// Give time for things to settle before capturing the number of
@ -50,6 +69,6 @@ func ensureNoGoroutinesLeak(t *testing.T, f func()) {
if after != before {
profile.WriteTo(os.Stderr, 2) // nolint
t.Fatalf("Number of Go routines has changed in %s from %d to %d", t.Name(), before, after)
t.Fatalf("Number of Go routines has changed from %d to %d", before, after)
}
}