diff --git a/package.json b/package.json
index 13826a6..7f1eb29 100644
--- a/package.json
+++ b/package.json
@@ -58,11 +58,11 @@
     "url-parse-lax": "^1.0.0"
   },
   "devDependencies": {
-    "ava": "^0.7.0",
+    "ava": "^0.8.0",
     "coveralls": "^2.11.4",
     "get-port": "^2.0.0",
     "into-stream": "^2.0.0",
-    "nyc": "^4.0.1",
+    "nyc": "^5.0.1",
     "pem": "^1.4.4",
     "pify": "^2.3.0",
     "tempfile": "^1.1.1",
@@ -71,10 +71,7 @@
   "xo": {
     "esnext": true,
     "ignores": [
-      "test/**"
-    ],
-    "rules": {
-      "prefer-reflect": 1
-    }
+      "test/_*"
+    ]
   }
 }
diff --git a/test/arguments.js b/test/arguments.js
index 9e25295..70d6437 100644
--- a/test/arguments.js
+++ b/test/arguments.js
@@ -4,7 +4,7 @@ import {createServer} from './_server';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -57,6 +57,6 @@ test('accepts url.parse object as first argument', async t => {
 	t.is((await got({hostname: s.host, port: s.port, path: '/test'})).body, '/test');
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/error.js b/test/error.js
index fd0279c..6d3536a 100644
--- a/test/error.js
+++ b/test/error.js
@@ -4,7 +4,7 @@ import {createServer} from './_server';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -51,6 +51,6 @@ test('options.body error message', async t => {
 	}
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/gzip.js b/test/gzip.js
index bd8ba0a..9851b08 100644
--- a/test/gzip.js
+++ b/test/gzip.js
@@ -7,7 +7,7 @@ const testContent = 'Compressible response content.\n';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -56,6 +56,6 @@ test('do not break HEAD responses', async t => {
 	t.is((await got.head(s.url)).body, '');
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/headers.js b/test/headers.js
index ffc87ce..23a1c22 100644
--- a/test/headers.js
+++ b/test/headers.js
@@ -4,7 +4,7 @@ import {createServer} from './_server';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -29,7 +29,7 @@ test('accept header with json option', async t => {
 	let headers = (await got(s.url, {json: true})).body;
 	t.is(headers.accept, 'application/json');
 
-	headers = (await got(s.url, {headers: {'accept': ''}, json: true})).body;
+	headers = (await got(s.url, {headers: {accept: ''}, json: true})).body;
 	t.is(headers.accept, '');
 });
 
@@ -48,6 +48,6 @@ test('zero content-length', async t => {
 	t.is(headers['content-length'], '0');
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/helpers.js b/test/helpers.js
index d4514ec..363ff31 100644
--- a/test/helpers.js
+++ b/test/helpers.js
@@ -4,7 +4,7 @@ import {createServer} from './_server';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -37,6 +37,6 @@ test('promise mode', async t => {
 	}
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/http.js b/test/http.js
index 3a09d0c..c2e4401 100644
--- a/test/http.js
+++ b/test/http.js
@@ -4,7 +4,7 @@ import {createServer} from './_server';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -70,6 +70,6 @@ test('query option', async t => {
 	t.is((await got(s.url, {query: 'recent=true'})).body, 'recent');
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/https.js b/test/https.js
index 1bf5bc8..42dd7cb 100644
--- a/test/https.js
+++ b/test/https.js
@@ -12,7 +12,7 @@ let caRootCert;
 
 const pemP = pify(pem, Promise);
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	const caKeys = await pemP.createCertificate({days: 1, selfSigned: true});
 
 	caRootKey = caKeys.serviceKey;
@@ -58,6 +58,6 @@ test('make request to https server with ca', async t => {
 	t.is(body, 'ok');
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/json.js b/test/json.js
index b0b08ef..a9b7421 100644
--- a/test/json.js
+++ b/test/json.js
@@ -4,7 +4,7 @@ import {createServer} from './_server';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -73,6 +73,6 @@ test('catches errors on invalid non-200 responses', async t => {
 	}
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/post.js b/test/post.js
index 5557940..70093c6 100644
--- a/test/post.js
+++ b/test/post.js
@@ -5,7 +5,7 @@ import {createServer} from './_server';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -109,6 +109,6 @@ test('content-type header is not overriden when object in options.body', async t
 	t.is(body['content-type'], 'doge');
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/redirects.js b/test/redirects.js
index a723e8b..7680543 100644
--- a/test/redirects.js
+++ b/test/redirects.js
@@ -4,7 +4,7 @@ import {createServer} from './_server';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -78,6 +78,6 @@ test('redirect only GET and HEAD requests', async t => {
 	}
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/retry.js b/test/retry.js
index d4f42d0..1ac842d 100644
--- a/test/retry.js
+++ b/test/retry.js
@@ -7,7 +7,7 @@ let trys = 0;
 let knocks = 0;
 let fifth = 0;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/long', () => {});
@@ -69,6 +69,6 @@ test('falsy value prevent retries', async t => {
 	}
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/stream.js b/test/stream.js
index 2d5aacf..d5ba4d2 100644
--- a/test/stream.js
+++ b/test/stream.js
@@ -5,7 +5,7 @@ import {createServer} from './_server';
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -117,9 +117,8 @@ test.cb('accepts option.body as Stream', t => {
 			t.is(chunk.toString(), 'wow');
 			t.end();
 		});
-
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });
diff --git a/test/unix-socket.js b/test/unix-socket.js
index 7237d52..6cda334 100644
--- a/test/unix-socket.js
+++ b/test/unix-socket.js
@@ -8,7 +8,7 @@ const socketPath = tempfile('.socket');
 
 let s;
 
-test.before('setup', async t => {
+test.before('setup', async () => {
 	s = await createServer();
 
 	s.on('/', (req, res) => {
@@ -28,6 +28,6 @@ test('protocol-less works', async t => {
 	t.is((await got(url)).body, 'ok');
 });
 
-test.after('cleanup', async t => {
+test.after('cleanup', async () => {
 	await s.close();
 });