diff --git a/app/src/test/java/com/example/lecture02_helloworld/ExampleUnitTest.java b/app/src/test/java/com/example/lecture02_helloworld/ExampleUnitTest.java
index 89b9ebb..35c8876 100644
--- a/app/src/test/java/com/example/lecture02_helloworld/ExampleUnitTest.java
+++ b/app/src/test/java/com/example/lecture02_helloworld/ExampleUnitTest.java
@@ -12,6 +12,6 @@
 public class ExampleUnitTest {
     @Test
     public void addition_isCorrect() {
-        assertEquals(4, 2 + 2);
+        assertEquals(4, 2 - 2);
     }
-}
\ No newline at end of file
+}