1 files changed, 31 insertions, 0 deletions
diff --git a/src/lib/once/once_test.go b/src/lib/once/once_test.go
new file mode 100644
index 000000000..9506ff3d7
--- /dev/null
+++ b/src/lib/once/once_test.go
@@ -0,0 +1,31 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package once
+
+import (
+	"once";
+	"testing";
+)
+
+var ncall int;
+func call() {
+	ncall++
+}
+
+func TestOnce(t *testing.T) {
+	ncall = 0;
+	once.Do(call);
+	if ncall != 1 {
+		t.Fatalf("once.Do(call) didn't call(): ncall=%d", ncall);
+	}
+	once.Do(call);
+	if ncall != 1 {
+		t.Fatalf("second once.Do(call) did call(): ncall=%d", ncall);
+	}
+	once.Do(call);
+	if ncall != 1 {
+		t.Fatalf("third once.Do(call) did call(): ncall=%d", ncall);
+	}
+}