1 files changed, 5 insertions, 33 deletions
diff --git a/src/testing/testing_test.go b/src/testing/testing_test.go
index 9954f9af8c..45e44683b4 100644
--- a/src/testing/testing_test.go
+++ b/src/testing/testing_test.go
@@ -5,42 +5,14 @@
 package testing_test
 
 import (
-	"fmt"
 	"os"
-	"runtime"
 	"testing"
-	"time"
 )
 
-func TestMain(m *testing.M) {
-	g0 := runtime.NumGoroutine()
-
-	code := m.Run()
-	if code != 0 {
-		os.Exit(code)
-	}
+// This is exactly what a test would do without a TestMain.
+// It's here only so that there is at least one package in the
+// standard library with a TestMain, so that code is executed.
 
-	// Check that there are no goroutines left behind.
-	t0 := time.Now()
-	stacks := make([]byte, 1<<20)
-	for {
-		g1 := runtime.NumGoroutine()
-		if g1 == g0 {
-			return
-		}
-		stacks = stacks[:runtime.Stack(stacks, true)]
-		time.Sleep(50 * time.Millisecond)
-		if time.Since(t0) > 2*time.Second {
-			fmt.Fprintf(os.Stderr, "Unexpected leftover goroutines detected: %v -> %v\n%s\n", g0, g1, stacks)
-			os.Exit(1)
-		}
-	}
-}
-
-func TestContextCancel(t *testing.T) {
-	ctx := t.Context()
-	// Tests we don't leak this goroutine:
-	go func() {
-		<-ctx.Done()
-	}()
+func TestMain(m *testing.M) {
+	os.Exit(m.Run())
 }