Fix.

node_modules/pn/test/cp.js

@@ -0,0 +1,13 @@
+// if running on older node, ensure that es6-shim is loaded first
+if (/^v0.10/.test(process.version)) { require('es6-shim'); }
+var assert= require('../assert');
+var cp = require('../child_process');
+
+describe('child_process module', function() {
+    it ('execFile(true)', function() {
+        return cp.execFile('true').promise.then(function(result) {
+            assert.equal(result.stdout, '');
+            assert.equal(result.stderr, '');
+        });
+    });
+});