Added unit tests for Mercator projection class.

- changed its methods to static
- add some documentation for its methods

#story[928]

src/test/java/seng302/models/map/MercatorProjectionTest.java

@@ -0,0 +1,42 @@
+package seng302.models.map;
+
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+/**
+ * Unit test for Mercator Project class.
+ * Created by hyi25 on 15/05/17.
+ */
+public class MercatorProjectionTest {
+	@Test
+	public void toMapPoint() throws Exception {
+		MapGeo geo1 = new MapGeo(12.485394, 19.38947);
+		MapPoint actualPoint1 = MercatorProjection.toMapPoint(geo1);
+		MapPoint expectedPoint1 = new MapPoint(141.78806755555556, 119.0503853635612);
+		assertEquals(expectedPoint1.getX(), actualPoint1.getX(), 0.0001);
+		assertEquals(expectedPoint1.getY(), actualPoint1.getY(), 0.0001);
+
+		MapGeo geo2 = new MapGeo(77.456432, -23.456462);
+		MapPoint actualPoint2 = MercatorProjection.toMapPoint(geo2);
+		MapPoint expectedPoint2 = new MapPoint(111.31984924444444, 38.03143323746788);
+		assertEquals(expectedPoint2.getX(), actualPoint2.getX(), 0.0001);
+		assertEquals(expectedPoint2.getY(), actualPoint2.getY(), 0.0001);
+	}
+
+	@Test
+	public void toMapGeo() throws Exception {
+		MapPoint point1 = new MapPoint(123.1234, 25.4565);
+		MapGeo actualGeo1 = MercatorProjection.toMapGeo(point1);
+		MapGeo expectedGeo1 = new MapGeo(80.77043127275441, -6.857718749999995);
+		assertEquals(expectedGeo1.getLat(), actualGeo1.getLat(), 0.0001);
+		assertEquals(expectedGeo1.getLng(), actualGeo1.getLng(), 0.0001);
+
+		MapPoint point2 = new MapPoint(1.235, 255.4565);
+		MapGeo actualGeo2 = MercatorProjection.toMapGeo(point2);
+		MapGeo expectedGeo2 = new MapGeo(-84.98475532898011, -178.26328125);
+		assertEquals(expectedGeo2.getLat(), actualGeo2.getLat(), 0.0001);
+		assertEquals(expectedGeo2.getLng(), actualGeo2.getLng(), 0.0001);
+	}
+
+}