adding toString method and the related test

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

@@ -9,12 +9,11 @@
 
 /**
  * Represents a rectangular geographical area on a map.
- * by: Mehdi Akbarian Rastaghi (@makbn)
+ * @author Mehdi Akbarian Rastaghi (@makbn)
  */
 @Getter
 @Setter
 @Builder
-@ToString
 public class JLBounds {
     /**
      * the north-east point of the bounds.
@@ -161,4 +160,9 @@ public boolean equals(Object o) {
     public int hashCode() {
         return Objects.hash(northEast, southWest);
     }
+
+    @Override
+    public String toString() {
+        return String.format("[%s, %s]", northEast, southWest);
+    }
 }

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

@@ -0,0 +1,18 @@
+apackage io.github.makbn.jlmap.model;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class JLBoundsTest {
+
+    @Test
+    void testToString() {
+        JLBounds bounds = JLBounds.builder()
+                .northEast(JLLatLng.builder().lat(10).lng(10).build())
+                .southWest(JLLatLng.builder().lat(40).lng(60).build())
+                .build();
+
+        assertEquals("[[10.000000, 10.000000], [40.000000, 60.000000]]", bounds.toString());
+    }
+}