diff --git a/cmdext/cmdrunner_test.go b/cmdext/cmdrunner_test.go
index 9e2d9b8..ac65670 100644
--- a/cmdext/cmdrunner_test.go
+++ b/cmdext/cmdrunner_test.go
@@ -224,3 +224,22 @@ func TestListener(t *testing.T) {
 		panic(err)
 	}
 }
+
+func TestLongStdout(t *testing.T) {
+
+	res1, err := Runner("python").
+		Arg("-c").
+		Arg("import sys; import time; print(\"1234\" * 10000 + \"\\n\"); print(\"1234\" * 10000 + \"\\n\"); print(\"1234\" * 10000 + \"\\n\");").
+		Timeout(100 * time.Millisecond).
+		Run()
+	if err != nil {
+		t.Errorf("%v", err)
+	}
+	if res1.StdErr != "" {
+		t.Errorf("res1.StdErr == '%v'", res1.StdErr)
+	}
+	if len(res1.StdOut) != 120006 {
+		t.Errorf("len(res1.StdOut) == '%v'", len(res1.StdOut))
+	}
+
+}