fix tests failing on appveyor

package.json

@@ -35,7 +35,7 @@
   ],
   "scripts": {
     "clean": "rm -Rf ./coverage",
-    "test": "istanbul cover _mocha --report none --print none --dir ./coverage/json -u exports -R test/*-test.js && istanbul report --root ./coverage/json html && istanbul check-coverage || true",
+    "test": "istanbul cover ./node_modules/mocha/bin/_mocha --report none --print none --dir ./coverage/json -u exports -R test/*-test.js && istanbul report --root ./coverage/json html && istanbul check-coverage || true",
     "doc": "jsdoc -c .jsdoc.json"
   }
 }

test/child-process.js

@@ -43,18 +43,16 @@ function _do_spawn(command_args, cb) {
 
   if (process.env.running_under_istanbul) {
     var
-      istanbul_path = path.join(__dirname, '..', 'node_modules', '.bin', 'istanbul'),
-      istanbul_args = [
-        'cover', '--report' , 'none', '--print', 'none', '--dir', path.join('coverage', 'json'), 
-        '--include-pid', command_args[0], '--', command_args[1]
-      ];
-    child = spawn(istanbul_path, istanbul_args);
-  }
-  else {
-    child = spawn(node_path, command_args);
+      istanbul_path = path.join(__dirname, '..', 'node_modules', 'istanbul', 'lib', 'cli.js');
+    command_args = [
+      istanbul_path, 'cover', '--report' , 'none', '--print', 'none',
+      '--dir', path.join('coverage', 'json'), '--include-pid',
+      command_args[0], '--', command_args[1]
+    ];
   }
   // spawn doesn’t have the quoting problems that exec does,
   // especially when going for Windows portability.
+  child = spawn(node_path, istanbul_args);
   child.stdin.end();
   // TODO:we no longer support node 0.6
   // Cannot use 'close' event because not on node-0.6.