adding a multi test and wrapping geoms in arrays to normalize ring co…

…unts

index.js

@@ -18,11 +18,13 @@ module.exports = function (collection, callback) {
 
     if (isPoint || isMultiPoint) {
       if (isPoint) coords = [[[coords]]]
+      else coords = [[coords]]
       loop(bbox, coords)
     }
 
     if (isLine || isMultiLine) {
       if (isLine) coords = [[coords]]
+      else coords = [coords]
       loop(bbox, coords)
     }
 
@@ -39,9 +41,11 @@ module.exports = function (collection, callback) {
 }
 
 function loop (bbox, coords) {
-  coords.forEach(function (r, j) {
-    r[0].forEach(function (c, k) {
-      extend(bbox, c)
+  coords.forEach(function (r) {
+    r.forEach(function (inner) {
+      inner.forEach(function (c) {
+        extend(bbox, c)
+      })
     })
   })
 }

test/index.js

@@ -1,5 +1,6 @@
 var esriExtent = require('..')
 var example = require('./geojson-spec-example.json')
+var exampleMulti = require('./geojson-multi-spec-example.json')
 var test = require('tape')
 var expected = {
   xmin: 100,
@@ -12,6 +13,17 @@ var expected = {
   }
 }
 
+var expectedMulti = {
+  xmin: 98,
+  ymin: 0,
+  xmax: 107,
+  ymax: 2,
+  spatialReference: {
+    wkid: 4326,
+    latestWkid: 4326
+  }
+}
+
 test('get correct extent from geojson spec example', function (t) {
   esriExtent(example, function (err, extent) {
     if (err) throw err
@@ -20,3 +32,12 @@ test('get correct extent from geojson spec example', function (t) {
     t.end()
   })
 })
+
+test('get correct extent from geojson multi spec example', function (t) {
+  esriExtent(exampleMulti, function (err, extent) {
+    if (err) throw err
+
+    t.deepEqual(extent, expectedMulti)
+    t.end()
+  })
+})