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tstest: make ResourceCheck panic on parallel tests

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To find potential flakes earlier.

Updates #deflake-effort

Change-Id: I52add6111d660821c3a23d4b1dd032821344bc48
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2023-10-06 18:54:59 -07:00 committed by Brad Fitzpatrick
parent 498f7ec663
commit f991c8a61f
2 changed files with 13 additions and 1 deletions
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11
tstest/resource.go
View File

@ -13,8 +13,19 @@
"github.com/google/go-cmp/cmp"
)
// ResourceCheck takes a snapshot of the current goroutines and registers a
// cleanup on tb to verify that after the rest, all goroutines created by the
// test go away. (well, at least that the count matches. Maybe in the future it
// can look at specific routines).
//
// It panics if called from a parallel test.
func ResourceCheck(tb testing.TB) {
tb.Helper()
// Set an environment variable (anything at all) just for the
// side effect of tb.Setenv panicking if we're in a parallel test.
tb.Setenv("TS_CHECKING_RESOURCES", "1")
startN, startStacks := goroutines()
tb.Cleanup(func() {
if tb.Failed() {

3
wgengine/magicsock/magicsock_test.go
View File

@ -705,6 +705,8 @@ func TestDiscokeyChange(t *testing.T) {
}
func TestActiveDiscovery(t *testing.T) {
tstest.ResourceCheck(t)
t.Run("simple_internet", func(t *testing.T) {
t.Parallel()
mstun := &natlab.Machine{Name: "stun"}
@ -900,7 +902,6 @@ func newPinger(t *testing.T, logf logger.Logf, src, dst *magicStack) (cleanup fu
// get exercised.
func testActiveDiscovery(t *testing.T, d *devices) {
tstest.PanicOnLog()
tstest.ResourceCheck(t)
tlogf, setT := makeNestable(t)
setT(t)