fix(tests): expectations of some async test where not working (#989)

test/collectInto.test.js

@@ -8,10 +8,5 @@ let p1 = Promise.resolve(1);
 let p2 = Promise.resolve(2);
 let p3 = new Promise(resolve => setTimeout(resolve, 2000, 3));
 test('Works with multiple promises', () => {
-  Pall(p1, p2, p3).then(
-    function(val) {
-      expect(val).toBe([1, 2, 3]);
-    },
-    function(reason) {}
-  );
+  return expect(Pall(p1, p2, p3)).resolves.toEqual([1, 2, 3]);
 });