adding toString method and the related test

src/main/java/io/github/makbn/jlmap/model/JLLatLng.java

@@ -7,13 +7,12 @@
 
 /**
  * Represents a geographical point with a certain latitude and longitude.
- * by: Mehdi Akbarian Rastaghi (@makbn)
+ * @author Mehdi Akbarian Rastaghi (@makbn)
  */
 @Getter
 @Setter
 @Builder
 @AllArgsConstructor
-@ToString
 public class JLLatLng {
     /** geographical given latitude in degrees */
     private final double lat;
@@ -72,4 +71,9 @@ public boolean equals(Object o, int maxMargin) {
     public int hashCode() {
         return Objects.hash(lat, lng);
     }
+
+    @Override
+    public String toString() {
+        return String.format("[%f, %f]", lat, lng);
+    }
 }

src/test/java/io/github/makbn/jlmap/model/JLLatLngTest.java

@@ -0,0 +1,81 @@
+package io.github.makbn.jlmap.model;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class JLLatLngTest {
+
+    @Test
+    void testEquals() {
+        JLLatLng pointA = JLLatLng.builder()
+                .lat(10)
+                .lng(20)
+                .build();
+
+        JLLatLng pointB = JLLatLng.builder()
+                .lat(10.000)
+                .lng(20.00)
+                .build();
+        Assertions.assertEquals(pointA, pointB);
+    }
+
+    @Test
+    void testNotEquals() {
+        JLLatLng pointA = JLLatLng.builder()
+                .lat(10)
+                .lng(20)
+                .build();
+
+        JLLatLng pointB = JLLatLng.builder()
+                .lat(20)
+                .lng(10)
+                .build();
+
+        Assertions.assertNotEquals(pointA, pointB);
+    }
+
+    @Test
+    void testDistanceCalculation_lng() {
+        JLLatLng pointA = JLLatLng.builder()
+                .lat(10)
+                .lng(20)
+                .build();
+
+        JLLatLng pointB = JLLatLng.builder()
+                .lat(10)
+                .lng(50)
+                .build();
+
+        Assertions.assertTrue(Math.abs(3282 - Math.round(pointA.distanceTo(pointB)/ 1000)) < 0.01);
+    }
+
+    @Test
+    void testDistanceCalculation_lat() {
+        JLLatLng pointA = JLLatLng.builder()
+                .lat(50)
+                .lng(10)
+                .build();
+
+        JLLatLng pointB = JLLatLng.builder()
+                .lat(20)
+                .lng(10)
+                .build();
+
+        Assertions.assertTrue(Math.abs(3334 - Math.round(pointA.distanceTo(pointB)/ 1000)) < 0.01);
+    }
+
+    @Test
+    void testDistanceCalculation_latLng() {
+        JLLatLng pointA = JLLatLng.builder()
+                .lat(50)
+                .lng(80)
+                .build();
+
+        JLLatLng pointB = JLLatLng.builder()
+                .lat(30)
+                .lng(10)
+                .build();
+
+        Assertions.assertTrue(Math.abs(6113 - Math.round(pointA.distanceTo(pointB)/ 1000)) < 0.01);
+    }
+}