turf-great-circle: Fix antipodal error message

Author: macrouch

packages/turf-great-circle/lib/arc.js

@@ -135,9 +135,9 @@ var GreatCircle = function (start, end, properties) {
   if (this.g === Math.PI) {
     throw new Error(
       "it appears " +
-        start.view() +
+        this.start.view() +
         " and " +
-        end.view() +
+        this.end.view() +
         " are 'antipodal', e.g diametrically opposite, thus there is no single route but rather infinite"
     );
   } else if (isNaN(this.g)) {

packages/turf-great-circle/test.ts

@@ -59,3 +59,16 @@ test("turf-great-circle with same input and output", (t) => {
 
   t.end();
 });
+
+test("turf-great-circle with antipodal start and end", (t) => {
+  const start = point([0, 90]);
+  const end = point([0, -90]);
+
+  t.throws(() => {
+    greatCircle(start, end, {
+      npoints: 4,
+    });
+  }, "it appears 0,90 and 0,-90 are 'antipodal', e.g diametrically opposite, thus there is no single route but rather infinite");
+
+  t.end();
+});