diff --git a/VectorTest.java b/VectorTest.java
index f0a6549..9d88260 100644
--- a/VectorTest.java
+++ b/VectorTest.java
@@ -7,7 +7,7 @@ public class VectorTest {
 
     @Test
     void testScalarMultiplicationVariants() {
-        int[] v1 = { 1, 2, 3 };
+        int[] v1 = { 1, -2, 3 };
         Vector.scalarMultiplication(v1, 2);
         assertArrayEquals(new int[] { 2, 4, 6 }, v1);
 
@@ -15,9 +15,15 @@ public class VectorTest {
         Vector.scalarMultiplication(v2, -1);
         assertArrayEquals(new int[] { -7, -8, -15 }, v2);
 
-        int[] v3 = { 0, 0, 0 };
+        int[] v3 = { 0,0,0};
         Vector.scalarMultiplication(v3, 5);
         assertArrayEquals(new int[] { 0, 0, 0 }, v3);
+        int[] v4 = {};
+        Vector.scalarMultiplication(v4, 2);
+        assertArrayEquals(new int[] {  0,0,0}, v4);
+        int[] v5 = null;
+        Vector.scalarMultiplication(v5, 5);
+        assertArrayEquals(null, v5);
     }
 
     @Test
@@ -84,7 +90,7 @@ public class VectorTest {
 
     @Test
     void testMatrixMultiplicationInvalidCases() {
-        int[][] nonSquare = {
+        int[][] non3DSquare = {
                 { 1, 2 },
                 { 3, 4 }
         };