test: Proper handing of /usr/bin/node lifecycle-path test

PR-URL: npm#228
Credit: @olivr70
Close: npm#228
Reviewed-by: @isaacs

test/broken-under-nyc-and-travis/lifecycle-path.js

@@ -4,6 +4,7 @@ var path = require('path')
 var mkdirp = require('mkdirp')
 var osenv = require('osenv')
 var rimraf = require('rimraf')
+var which = require('which')
 var test = require('tap').test
 
 var common = require('../common-tap.js')
@@ -21,6 +22,9 @@ if (isWindows) {
   PATH = '/bin:/usr/bin'
 }
 
+var systemNode = which.sync('node', { nothrow: true, path: PATH })
+// the path to the system wide node (null if none)
+
 test('setup', function (t) {
   cleanup()
   mkdirp.sync(pkg)
@@ -183,6 +187,12 @@ function checkPath (testconfig, t) {
             'The node binary used for scripts is.*' +
             process.execPath.replace(/[/\\]/g, '.'))
           t.match(stderr, regex, 'reports the current binary vs conflicting')
+        } else if (systemNode !== null) {
+          var regexSystemNode = new RegExp(
+            'The node binary used for scripts is.*' +
+            systemNode.replace(/[/\\]/g, '.')
+          )
+          t.match(stderr, regexSystemNode, 'reports the system binary vs conflicting')
         } else {
           t.match(stderr, /there is no node binary in the current PATH/, 'informs user that there is no node binary in PATH')
         }