diff --git a/src/test/java/fr/nancy/iut/CalcEngineTest.java b/src/test/java/fr/nancy/iut/CalcEngineTest.java
index d05c964782e7b8345dc325546ca17fc40cf4d6f0..c467b9ad74ae06ab8464af73103c7b89995ca132 100644
--- a/src/test/java/fr/nancy/iut/CalcEngineTest.java
+++ b/src/test/java/fr/nancy/iut/CalcEngineTest.java
@@ -114,7 +114,18 @@ public class CalcEngineTest {
         calc.numberPressed(5);
         calc.plus();
         calc.numberPressed(5);
+        calc.plus();
+        calc.numberPressed(5);
         calc.equals();
-        assertEquals(10, calc.getDisplayValue());
+        assertEquals(15, calc.getDisplayValue());
+
+        calc.clear();
+
+        calc.minus();
+        calc.numberPressed(10);
+        calc.plus();
+        calc.numberPressed(15);
+        calc.equals();
+        assertEquals(5, calc.getDisplayValue());
     }
 }