fix #8 #6

tests/exhaustive.js

@@ -0,0 +1,32 @@
+'use strict';
+
+var jS2 = require('../src/s2geometry.js').S2;
+var nS2 = require('s2geometry-node');
+
+var x, y;
+
+function checkReal(lat, lng) {
+  var nS2LatLng = new nS2.S2LatLng(lat, lng).toPoint();
+  var nCell = new nS2.S2CellId(nS2LatLng).parent(15);
+  var jCell = jS2.S2Cell.FromLatLng({ lat: lat, lng: lng }, 15);
+  var nKey = nCell.toString();
+  var jQuad = jCell.getFaceAndQuads();
+  var jKey = jQuad[0] + '/' + jQuad[1].join('');
+
+  if (nKey !== jKey) {
+    console.log('');
+    console.log('Quadkey');
+    console.log('=', nKey);
+    console.log('j', jKey);
+    throw new Error("values didn't match expected");
+  }
+}
+
+console.log('Exhaustive check of about 518,400 random lat,lng coordinates of the earth (about every 0.5°)');
+console.log('(this will take several seconds)');
+for (x = -180; x <= 180; x += (0 + Math.random())) {
+  for (y = -180; y <= 180; y += (0 + Math.random())) {
+    checkReal(x, y);
+  }
+}
+console.log('PASS');