add example test

Author: mauri870

src/cmd/go/testdata/script/test_skip.txt

@@ -32,3 +32,6 @@ func Test1(t *testing.T) {
 func Test2(t *testing.T) {
 	t.Run("3", func(t *testing.T) {})
 }
+
+func ExampleTest(t *testing.T) {
+}