Leaktest 
Refactored, tested variant of the goroutine leak detector found in both
net/http tests and the cockroachdb source tree.
Takes a snapshot of running goroutines at the start of a test, and at the end -
compares the two and voila. Ignores runtime/sys goroutines. Doesn't play nice
with t.Parallel() right now, but there are plans to do so.
Installation
Go 1.7+
go get -u github.com/fortytw2/leaktest
Go 1.5/1.6 need to use the tag v1.0.0, as newer versions depend on
context.Context.
Example
These tests fail, because they leak a goroutine
// Default "Check" will poll for 5 seconds to check that all
// goroutines are cleaned up
func TestPool(t *testing.T) {
defer leaktest.Check(t)()
go func() {
for {
time.Sleep(time.Second)
}
}()
}
// Helper function to timeout after X duration
func TestPoolTimeout(t *testing.T) {
defer leaktest.CheckTimeout(t, time.Second)()
go func() {
for {
time.Sleep(time.Second)
}
}()
}
// Use Go 1.7+ context.Context for cancellation
func TestPoolContext(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
defer leaktest.CheckContext(ctx, t)()
go func() {
for {
time.Sleep(time.Second)
}
}()
}
LICENSE
Same BSD-style as Go, see LICENSE