Adds some block location tests

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

@@ -0,0 +1,50 @@
+package net.knarcraft.stargate.container;
+
+import be.seeseemelk.mockbukkit.WorldMock;
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class BlockLocationTest {
+
+    @Test
+    public void makeRelativeBlockLocationTest() {
+        WorldMock world = new WorldMock();
+        BlockLocation startLocation = new BlockLocation(world, 5, 4, 3);
+
+        //Move to some other, different location
+        BlockLocation relativeLocation = startLocation.makeRelativeBlockLocation(4, 6, 8);
+        Assertions.assertNotEquals(startLocation, relativeLocation);
+
+        //Move back to make sure we can go back to where we started by going in the opposite direction
+        BlockLocation sameAsStartLocation = relativeLocation.makeRelativeBlockLocation(-4, -6, -8);
+        Assertions.assertEquals(startLocation, sameAsStartLocation);
+    }
+
+    @Test
+    public void getRelativeLocationTest() {
+        WorldMock world = new WorldMock();
+        BlockLocation startLocation = new BlockLocation(world, 7, 3, 6);
+
+        RelativeBlockVector relativeBlockVector = new RelativeBlockVector(2, 1, 3);
+        BlockLocation relativeLocation1 = startLocation.getRelativeLocation(relativeBlockVector, 0);
+        //With yaw = 0, going right goes in the x direction, and distance goes in the z direction, while y is decremented
+        BlockLocation targetLocation1 = new BlockLocation(world, 9, 2, 9);
+        Assertions.assertEquals(targetLocation1, relativeLocation1);
+
+        BlockLocation relativeLocation2 = startLocation.getRelativeLocation(relativeBlockVector, 90);
+        //With yaw = 90, going right goes in the z direction, and distance goes in the -x direction, while y is decremented
+        BlockLocation targetLocation2 = new BlockLocation(world, 4, 2, 8);
+        Assertions.assertEquals(targetLocation2, relativeLocation2);
+
+        BlockLocation relativeLocation3 = startLocation.getRelativeLocation(relativeBlockVector, 180);
+        //With yaw = 180, going right goes in the -x direction, and distance goes in the -z direction, while y is decremented
+        BlockLocation targetLocation3 = new BlockLocation(world, 5, 2, 3);
+        Assertions.assertEquals(targetLocation3, relativeLocation3);
+
+        BlockLocation relativeLocation4 = startLocation.getRelativeLocation(relativeBlockVector, 270);
+        //With yaw = 270, going right goes in the -z direction, and distance goes in the x direction, while y is decremented
+        BlockLocation targetLocation4 = new BlockLocation(world, 10, 2, 4);
+        Assertions.assertEquals(targetLocation4, relativeLocation4);
+    }
+
+}