added junit4 as testing dependency, converted coordinate conversion test to junit test

pom.xml

@@ -125,5 +125,11 @@
 			<artifactId>jgoogleanalytics</artifactId>
 			<version>0.4</version>
 		</dependency>
+		<dependency>
+			<groupId>junit</groupId>
+			<artifactId>junit</artifactId>
+			<version>4.11</version>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 </project>

src/main/java/amidst/mojangapi/world/coordinates/CoordinateUtils.java

@@ -38,28 +38,4 @@ public enum CoordinateUtils {
 	private static long modulo(long a, long b) {
 		return ((a % b) + b) % b;
 	}
-
-	// TODO: convert to unit test
-	public static void main(String[] args) {
-		if (ensureCoordinateConversionWorks()) {
-			System.out.println("Coordinate conversion is working!");
-		} else {
-			System.out.println("Coordinate conversion is faulty!");
-		}
-	}
-
-	private static boolean ensureCoordinateConversionWorks() {
-		boolean successful = true;
-		for (long inWorld = -1000; inWorld < 1000; inWorld++) {
-			long inFragment = toFragmentRelative(inWorld);
-			long inWorldOfFragment = toFragmentCorner(inWorld);
-			long inWorld2 = toWorld(inWorldOfFragment, inFragment);
-			if (inWorld != inWorld2) {
-				successful = false;
-				System.out.println(inWorld + " != " + inWorld2 + " ("
-						+ inWorldOfFragment + " + " + inFragment + ")");
-			}
-		}
-		return successful;
-	}
 }

src/test/java/amidst/mojangapi/world/coordinates/CoordinateUtilsTest.java

@@ -0,0 +1,24 @@
+package amidst.mojangapi.world.coordinates;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class CoordinateUtilsTest {
+	@Test
+	public void testCoordinateConversion() {
+		Assert.assertTrue(ensureCoordinateConversionWorks());
+	}
+
+	private static boolean ensureCoordinateConversionWorks() {
+		for (long inWorld = -1000; inWorld < 1000; inWorld++) {
+			long inFragment = CoordinateUtils.toFragmentRelative(inWorld);
+			long inWorldOfFragment = CoordinateUtils.toFragmentCorner(inWorld);
+			long actualInWorld = CoordinateUtils.toWorld(inWorldOfFragment,
+					inFragment);
+			if (inWorld != actualInWorld) {
+				return false;
+			}
+		}
+		return true;
+	}
+}