diff --git a/src/test/kotlin/com/sangdol/validation/DemoControllerTest.kt b/src/test/kotlin/com/sangdol/validation/DemoControllerTest.kt
index 2383c1f..4008f6a 100644
--- a/src/test/kotlin/com/sangdol/validation/DemoControllerTest.kt
+++ b/src/test/kotlin/com/sangdol/validation/DemoControllerTest.kt
@@ -76,7 +76,7 @@ class DemoControllerTest {
         }
     }
 
-    private fun run(endpoint: String, body: String, expectedStatus: Int): ResultActions = mockMvc!!
+    private fun run(endpoint: String, body: String, expectedStatus: Int): ResultActions = mockMvc
         .perform(
             post(endpoint)
                 .contentType(MediaType.APPLICATION_JSON_VALUE)