Adds some tests to the relative block vector

src/test/java/net/knarcraft/stargate/container/RelativeBlockVectorTest.java

@@ -0,0 +1,53 @@
+package net.knarcraft.stargate.container;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class RelativeBlockVectorTest {
+
+    @Test
+    public void addToVectorTest() {
+        int right = 5;
+        int depth = 5;
+        int distance = 3;
+
+        RelativeBlockVector relativeBlockVector = new RelativeBlockVector(right, depth, distance);
+
+        for (int i = 0; i < 1000; i++) {
+            int randomValue = getRandomNumber();
+            RelativeBlockVector newVector = relativeBlockVector.addToVector(RelativeBlockVector.Property.RIGHT, randomValue);
+            Assertions.assertEquals(new RelativeBlockVector(right + randomValue, depth, distance), newVector);
+
+            newVector = relativeBlockVector.addToVector(RelativeBlockVector.Property.DISTANCE, randomValue);
+            Assertions.assertEquals(new RelativeBlockVector(right, depth, distance + randomValue), newVector);
+
+            newVector = relativeBlockVector.addToVector(RelativeBlockVector.Property.DEPTH, randomValue);
+            Assertions.assertEquals(new RelativeBlockVector(right, depth + randomValue, distance), newVector);
+        }
+    }
+
+    @Test
+    public void invertTest() {
+        for (int i = 0; i < 1000; i++) {
+            int randomNumber1 = getRandomNumber();
+            int randomNumber2 = getRandomNumber();
+            int randomNumber3 = getRandomNumber();
+
+            RelativeBlockVector relativeBlockVector = new RelativeBlockVector(randomNumber1, randomNumber2,
+                    randomNumber3);
+            RelativeBlockVector invertedBlockVector = new RelativeBlockVector(-randomNumber1, -randomNumber2,
+                    -randomNumber3);
+            Assertions.assertEquals(invertedBlockVector, relativeBlockVector.invert());
+        }
+    }
+
+    /**
+     * Gets a random number between -500 and 500
+     *
+     * @return <p>A random number between -500 and 500</p>
+     */
+    private int getRandomNumber() {
+        return (int) ((Math.random() - 0.5) * 1000);
+    }
+
+}