UPDATE getUrl with actual mappings

__test__/common.spec.js

@@ -60,7 +60,7 @@ describe('common', () => {
       const url = common.getUrl({
         default: 'http://url.tar.gz',
         windows: 'http://url.exe.zip'
-      }, { platform: 'windows' });
+      }, { platform: 'win32' });
 
       expect(url).toEqual('http://url.exe.zip');
     });
@@ -82,7 +82,7 @@ describe('common', () => {
           default: 'http://url_darwin.tar.gz',
           386: 'http://url_darwin_i386.tar.gz'
         }
-      }, { platform: 'darwin', arch: '386' });
+      }, { platform: 'darwin', arch: 'ia32' });
 
       expect(url).toEqual('http://url_darwin_i386.tar.gz');
     });

package.json

@@ -15,7 +15,7 @@
   "dependencies": {
     "mkdirp": "^0.5.1",
     "request": "^2.81.0",
-    "tar": "^2.2.1"
+    "tar": "^2.2.2"
   },
   "repository": {
     "type": "git",
@@ -23,8 +23,8 @@
   },
   "homepage": "https://github.com/sanathkr/go-npm",
   "devDependencies": {
-    "babel-cli": "^6.24.1",
-    "babel-core": "^6.25.0",
+    "babel-cli": "^6.26.0",
+    "babel-core": "^6.26.0",
     "babel-preset-es2015": "^6.24.1",
     "jest": "^24.5.0"
   }

src/common.js

@@ -78,8 +78,8 @@ function getUrl(url, process) {
 
   let _url;
 
-  if (url[process.platform]) {
-      _url = url[process.platform];
+  if (url[PLATFORM_MAPPING[process.platform]]) {
+      _url = url[PLATFORM_MAPPING[process.platform]];
   } else {
       _url = url.default;
   }
@@ -88,8 +88,8 @@ function getUrl(url, process) {
       return _url;
   }
 
-  if (_url[process.arch]) {
-      _url = _url[process.arch]
+  if (_url[ARCH_MAPPING[process.arch]]) {
+      _url = _url[ARCH_MAPPING[process.arch]]
   } else {
       _url = _url.default;
   }