diff --git a/src/test/java/org/chulk/sanxbox/TestConcurrency.java b/src/test/java/org/chulk/sanxbox/TestConcurrency.java
new file mode 100644
index 0000000..ee3ff1f
--- /dev/null
+++ b/src/test/java/org/chulk/sanxbox/TestConcurrency.java
@@ -0,0 +1,5 @@
+package org.chulk.sanxbox;
+
+public class TestConcurrency {
+
+}