Fix tests

There is no need to explicitly use npm.cmd on Windows

Author: oliversalzburg

lib/npm-command.js

@@ -1,7 +1,5 @@
 'use strict';
 
-var npm = process.platform === 'win32' ? 'npm.cmd' : 'npm';
-
 module.exports = function (command, globals) {
   var hasGlobals = globals && globals.length;
   var args = [command, '--color=always'];
@@ -11,7 +9,7 @@ module.exports = function (command, globals) {
   }
 
   return {
-    command: npm,
+    command: 'npm',
     args: args,
     screen: 'npm ' + command + (hasGlobals ? ' -g ' + globals.join(' ') : '')
   };

test/index.js

@@ -18,7 +18,7 @@ test('npm command', function (t) {
   t.same(installGlobal, {
     command: 'npm',
     args: ['install', '--color=always', 'bower'],
-    screen: 'npm install -g'
+    screen: 'npm install -g bower'
   }, 'globals are correct');
   t.end();
 });