diff --git a/src/test/java/fr/nancy/iut/CalcEngineTest.java b/src/test/java/fr/nancy/iut/CalcEngineTest.java
index c467b9ad74ae06ab8464af73103c7b89995ca132..1bcf2cf6be126f56169fb951c0ea52357933cbe8 100644
--- a/src/test/java/fr/nancy/iut/CalcEngineTest.java
+++ b/src/test/java/fr/nancy/iut/CalcEngineTest.java
@@ -91,6 +91,14 @@ public class CalcEngineTest {
         calc.equals();
 
         assertEquals(3, calc.getDisplayValue());
+
+        calc.clear();
+
+
+        calc.minus();
+        calc.numberPressed(5);
+        calc.equals();
+        assertEquals(5, calc.getDisplayValue());
     }
 
     @Test