diff --git a/pom.xml b/pom.xml
index b61fd665..057b8661 100644
--- a/pom.xml
+++ b/pom.xml
@@ -30,6 +30,8 @@
             <failsOnError>true</failsOnError>
             <consoleOutput>true</consoleOutput>
             <configLocation>checkstyle.xml</configLocation>
+            <source>1.6</source>
+            <target>1.6</target>
           </configuration>
           <executions>
             <execution>
diff --git a/src/test/java/com/github/pedrovgs/problem2/VectorScalarProductTest.java b/src/test/java/com/github/pedrovgs/problem2/VectorScalarProductTest.java
index 8cf5e310..ac2f46f0 100644
--- a/src/test/java/com/github/pedrovgs/problem2/VectorScalarProductTest.java
+++ b/src/test/java/com/github/pedrovgs/problem2/VectorScalarProductTest.java
@@ -79,4 +79,17 @@ public void differentSizeVectorsShouldThrowException() {
 
     assertEquals(-4, result);
   }
+  @Test public void shouldReturnTrueValueIfHasProductOfMaxIntegerAndZero() {
+    int max = Integer.MAX_VALUE;
+    Vector v1 = new Vector(max, max, max, max);
+    Vector v2 = new Vector(0, 0, 0, 0);
+    assertEquals(0, vectorScalarProduct.calculateScalarProduct(v1, v2));
+  }
+  
+  @Test public void shouldReturnTrueValueIfHasProductOfMinIntegerAndZero() {
+    int min = Integer.MIN_VALUE;
+    Vector v1 = new Vector(min, min, min, min);
+    Vector v2 = new Vector(0, 0, 0, 0);
+    assertEquals(0, vectorScalarProduct.calculateScalarProduct(v1, v2));
+  }
 }