some more test fixes

package.json

@@ -61,7 +61,7 @@
     "url-parse-lax": "^1.0.0"
   },
   "devDependencies": {
-    "ava": "^0.3.0",
+    "ava": "^0.4.1",
     "coveralls": "^2.11.4",
     "get-port": "^2.0.0",
     "into-stream": "^2.0.0",

test/_server.js

@@ -3,6 +3,7 @@ var http = require('http');
 var https = require('https');
 var pify = require('pify');
 var getPort = require('get-port');
+var Promise = require('pinkie-promise');
 var host = exports.host = 'localhost';
 
 exports.createServer = function () {
@@ -16,8 +17,8 @@ exports.createServer = function () {
 		s.url = 'http://' + host + ':' + port;
 		s.protocol = 'http';
 
-		s.listen = pify(s.listen);
-		s.close = pify(s.close);
+		s.listen = pify(s.listen, Promise);
+		s.close = pify(s.close, Promise);
 
 		return s;
 	});
@@ -34,8 +35,8 @@ exports.createSSLServer = function (opts) {
 		s.url = 'https://' + host + ':' + port;
 		s.protocol = 'https';
 
-		s.listen = pify(s.listen);
-		s.close = pify(s.close);
+		s.listen = pify(s.listen, Promise);
+		s.close = pify(s.close, Promise);
 
 		return s;
 	});

test/arguments.js

@@ -1,5 +1,4 @@
 import test from 'ava';
-import pify from 'pify';
 import got from '../';
 import {createServer} from './_server';
 

test/https.js

@@ -10,7 +10,7 @@ let cert;
 let caRootKey;
 let caRootCert;
 
-const pemP = pify(pem);
+const pemP = pify(pem, Promise);
 
 test.before('setup', async t => {
 	const caKeys = await pemP.createCertificate({days: 1, selfSigned: true});