diff --git a/package.json b/package.json
index b117618..7caa5a2 100644
--- a/package.json
+++ b/package.json
@@ -26,11 +26,6 @@
       "array-includes"
     ]
   },
-  "ava": {
-    "require": [
-      "./test/helpers/setup-browser-env.js"
-    ]
-  },
   "xo": {
     "env": "browser",
     "extends": "xo-lukechilds"
@@ -60,11 +55,9 @@
     "ava": "^0.19.1",
     "babel-plugin-array-includes": "^2.0.3",
     "babel-preset-es2015": "^6.24.1",
-    "browser-env": "^2.0.23",
     "camelcase": "^4.0.0",
     "coveralls": "^2.11.15",
     "eslint-config-xo-lukechilds": "^1.0.0",
-    "jsdom": "^11.0.0",
     "nyc": "^11.0.2",
     "rollup": "^0.42.0",
     "rollup-plugin-babel": "^2.7.1",
diff --git a/test/helpers/setup-browser-env.js b/test/helpers/setup-browser-env.js
deleted file mode 100644
index b81bad5..0000000
--- a/test/helpers/setup-browser-env.js
+++ /dev/null
@@ -1 +0,0 @@
-require('browser-env')(['window']);
diff --git a/test/types.js b/test/types.js
index d1ec86c..4b00539 100644
--- a/test/types.js
+++ b/test/types.js
@@ -7,7 +7,8 @@ test('whenDomReady is a function', t => {
 });
 
 test('whenDomReady returns a Promise', t => {
-	t.true(whenDomReady() instanceof Promise);
+	const { document } = new Window();
+	t.true(whenDomReady(document) instanceof Promise);
 });
 
 test('whenDomReady.resume is a function', t => {
@@ -15,7 +16,8 @@ test('whenDomReady.resume is a function', t => {
 });
 
 test('whenDomReady.resume returns a function that returns a promise', t => {
-	const returnValue = whenDomReady.resume();
+	const { document } = new Window();
+	const returnValue = whenDomReady.resume(document);
 	t.is(typeof returnValue, 'function');
 	t.true(returnValue() instanceof Promise);
 });
diff --git a/test/unit.js b/test/unit.js
index b4b26a4..a2d62f6 100644
--- a/test/unit.js
+++ b/test/unit.js
@@ -1,72 +1,49 @@
+import EventEmitter from 'events';
 import test from 'ava';
-import jsdom from 'jsdom';
+import Window from 'window';
 import whenDomReady from '../';
 
-test.cb('callback fires with global document', t => {
+test.cb('callback fires', t => {
 	t.plan(1);
+	const { document } = new Window();
 	whenDomReady(() => {
 		t.pass();
 		t.end();
-	});
+	}, document);
 });
 
-test('Promise resolves with global document', async t => {
+test('Promise resolves', async t => {
+	const { document } = new Window();
 	t.plan(1);
-	await whenDomReady().then(() => t.pass());
+	await whenDomReady(document).then(() => t.pass());
 });
 
-test.cb('callback fires with local document', t => {
-	t.plan(1);
-	const config = {
-		html: '',
-		onload: window => whenDomReady(() => {
-			t.pass();
-			t.end();
-		}, window.document)
-	};
-	jsdom.env(config);
-});
-
-test.cb('Promise resolves with local document', t => {
+test('Promise chain helper passes value through', async t => {
+	const { document } = new Window();
 	t.plan(1);
-	const config = {
-		html: '',
-		onload: window => whenDomReady(window.document).then(() => {
-			t.pass();
-			t.end();
-		})
-	};
-	jsdom.env(config);
+	await Promise
+		.resolve('foo')
+		.then(whenDomReady.resume(document))
+		.then(val => t.is(val, 'foo'));
 });
 
-test.cb('callback fires if we run after DOMContentLoaded', t => {
+test('If document.readyState is already "interactive" run cb', async t => {
+	const document = { readyState: 'interactive' };
 	t.plan(1);
-	const config = {
-		html: '',
-		created: (err, window) => whenDomReady(() => {
-			t.pass();
-			t.end();
-		}, window.document)
-	};
-	jsdom.env(config);
+	await whenDomReady(document).then(() => t.pass());
 });
 
-test.cb('Promise resolves if we run after DOMContentLoaded', t => {
+test('If document.readyState is already "complete" run cb', async t => {
+	const document = { readyState: 'complete' };
 	t.plan(1);
-	const config = {
-		html: '',
-		created: (err, window) => whenDomReady(window.document).then(() => {
-			t.pass();
-			t.end();
-		})
-	};
-	jsdom.env(config);
+	await whenDomReady(document).then(() => t.pass());
 });
 
-test('Promise chain helper passes value through', async t => {
+test('If document.readyState is "loading" run cb on DOMContentLoaded event', async t => {
+	const document = new EventEmitter();
+	document.addEventListener = document.on;
+	document.readyState = 'loading';
 	t.plan(1);
-	await Promise
-		.resolve('foo')
-		.then(whenDomReady.resume())
-		.then(val => t.is(val, 'foo'));
+	setTimeout(() => document.emit('DOMContentLoaded'), 500);
+	await whenDomReady(document).then(() => t.pass());
 });