fixed Isochrone contours_meters required parameter count

Fixed an issue where Isochrone API's `contours_meters` required at least two input values, instead of only one.

Author: Łukasz Paczos

CHANGELOG.md

@@ -4,6 +4,8 @@ Mapbox welcomes participation and contributions from everyone.
 
 ### main
 
+- Fixed an issue where Isochrone API's `contours_meters` required at least two input values, instead of only one.
+
 ### v7.3.0 - October 04, 2024
 
 - Updated IsoChrone API to support new query parameters including contours_meters, road/route exclusions and departure time. [#1596](https://github.com/mapbox/mapbox-java/pull/1596)

services-isochrone/src/main/java/com/mapbox/api/isochrone/MapboxIsochrone.java

@@ -498,8 +498,8 @@ public MapboxIsochrone build() {
                       + " in order from the lowest number to the highest number.");
             }
           }
-          contoursMeters(TextUtils.join(",", contoursMeters));
         }
+        contoursMeters(TextUtils.join(",", contoursMeters));
       }
 
       if (contoursColors != null) {

services-isochrone/src/test/java/com/mapbox/api/isochrone/MapboxIsochroneTest.java

@@ -155,6 +155,38 @@ public void build_usingIntegerListForMinutes() throws ServicesException, IOExcep
         + "36" + commaEquivalent + "52"));
   }
 
+  @Test
+  public void build_usingIntegerListForMinutes_oneParam() throws ServicesException, IOException {
+    MapboxIsochrone client = MapboxIsochrone.builder()
+      .accessToken(ACCESS_TOKEN)
+      .coordinates(testPoint)
+      .addContoursMinutes(14)
+      .profile(testProfile)
+      .baseUrl(mockUrl.toString())
+      .build();
+    String requestUrlString = client.cloneCall().request().url().toString();
+
+    System.out.print(requestUrlString);
+
+    assertTrue(requestUrlString.contains("contours_minutes=14"));
+  }
+
+  @Test
+  public void build_usingIntegerListForMeters_oneParam() throws ServicesException, IOException {
+    MapboxIsochrone client = MapboxIsochrone.builder()
+      .accessToken(ACCESS_TOKEN)
+      .coordinates(testPoint)
+      .addContoursMeters(14)
+      .profile(testProfile)
+      .baseUrl(mockUrl.toString())
+      .build();
+    String requestUrlString = client.cloneCall().request().url().toString();
+
+    System.out.print(requestUrlString);
+
+    assertTrue(requestUrlString.contains("contours_meters=14"));
+  }
+
   @Test
   public void build_usingRawStringForMinutes() throws ServicesException, IOException {