1 files changed, 18 insertions, 0 deletions
diff --git a/src/runtime/proc_test.go b/src/runtime/proc_test.go
index 30798f723d..f3e90bcbd7 100644
--- a/src/runtime/proc_test.go
+++ b/src/runtime/proc_test.go
@@ -9,6 +9,7 @@ import (
 	"net"
 	"runtime"
 	"runtime/debug"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"syscall"
@@ -336,6 +337,23 @@ func TestGCFairness(t *testing.T) {
 	}
 }
 
+func TestNumGoroutine(t *testing.T) {
+	output := runTestProg(t, "testprog", "NumGoroutine")
+	want := "1\n"
+	if output != want {
+		t.Fatalf("want %q, got %q", want, output)
+	}
+
+	buf := make([]byte, 1<<20)
+	buf = buf[:runtime.Stack(buf, true)]
+
+	n := runtime.NumGoroutine()
+
+	if nstk := strings.Count(string(buf), "goroutine "); n != nstk {
+		t.Fatalf("NumGoroutine=%d, but found %d goroutines in stack dump", n, nstk)
+	}
+}
+
 func TestPingPongHog(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping in -short mode")