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