Add type test for whenDomReady.resume

test/types.js

@@ -8,3 +8,13 @@ test('whenDomReady is a function', t => {
 test('whenDomReady returns a Promise', t => {
 	t.true(whenDomReady() instanceof Promise);
 });
+
+test('whenDomReady.resume is a function', t => {
+	t.is(typeof whenDomReady.resume, 'function');
+});
+
+test('whenDomReady.resume returns a function that returns a promise', t => {
+	const returnValue = whenDomReady.resume();
+	t.is(typeof returnValue, 'function');
+	t.true(returnValue() instanceof Promise);
+});