diff --git a/test/chainAsync.test.js b/test/chainAsync.test.js
index 857f77035..2349f1a52 100644
--- a/test/chainAsync.test.js
+++ b/test/chainAsync.test.js
@@ -5,7 +5,7 @@ test('chainAsync is a Function', () => {
 });
 
 let incrementer = 0;
-test('Calls all functions in an array', () => {
+test('Calls all functions in an array', done => {
   chainAsync([
     next => {
       incrementer += 1;
@@ -17,17 +17,19 @@ test('Calls all functions in an array', () => {
     },
     next => {
       expect(incrementer).toEqual(2);
+      done();
     }
   ]);
 });
 
-test('Last function does not receive "next" argument', () => {
+test('Last function does not receive "next" argument', done => {
   chainAsync([
     next => {
       next();
     },
     next => {
       expect(next).toBe(undefined);
+      done();
     }
   ]);
 });
diff --git a/test/collectInto.test.js b/test/collectInto.test.js
index 6c7ef705e..dd4dc87e3 100644
--- a/test/collectInto.test.js
+++ b/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]);
 });
diff --git a/test/debounce.test.js b/test/debounce.test.js
index da370976a..7310d9584 100644
--- a/test/debounce.test.js
+++ b/test/debounce.test.js
@@ -3,8 +3,10 @@ const {debounce} = require('./_30s.js');
 test('debounce is a Function', () => {
   expect(debounce).toBeInstanceOf(Function);
 });
-test('Works as expected', () => {
-  debounce(() => {
+test('Works as expected', done => {
+  const debouncedFn = debounce(() => {
     expect(true).toBeTruthy();
+    done();
   });
+  debouncedFn();
 });
diff --git a/test/delay.test.js b/test/delay.test.js
index b809b11ff..b14785c52 100644
--- a/test/delay.test.js
+++ b/test/delay.test.js
@@ -3,10 +3,11 @@ const {delay} = require('./_30s.js');
 test('delay is a Function', () => {
   expect(delay).toBeInstanceOf(Function);
 });
-test('Works as expecting, passing arguments properly', () => {
+test('Works as expecting, passing arguments properly', done => {
   delay(
     function(text) {
       expect(text).toBe('test');
+      done();
     },
     1000,
     'test'
diff --git a/test/hashNode.test.js b/test/hashNode.test.js
index 1950b5f47..16bb514e5 100644
--- a/test/hashNode.test.js
+++ b/test/hashNode.test.js
@@ -3,8 +3,10 @@ const {hashNode} = require('./_30s.js');
 test('hashNode is a Function', () => {
   expect(hashNode).toBeInstanceOf(Function);
 });
-test('Produces the appropriate hash', () => {
-  hashNode(JSON.stringify({ a: 'a', b: [1, 2, 3, 4], foo: { c: 'bar' } })).then(v =>
-    expect(v).toBe('04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393')
+test("Produces the appropriate hash", () => {
+  expect(
+    hashNode(JSON.stringify({ a: "a", b: [1, 2, 3, 4], foo: { c: "bar" } }))
+  ).resolves.toBe(
+    "04aa106279f5977f59f9067fa9712afc4aedc6f5862a8defc34552d8c7206393"
   );
 });
diff --git a/test/runPromisesInSeries.test.js b/test/runPromisesInSeries.test.js
index 151dd9b66..73ddfd155 100644
--- a/test/runPromisesInSeries.test.js
+++ b/test/runPromisesInSeries.test.js
@@ -5,5 +5,7 @@ test('runPromisesInSeries is a Function', () => {
 });
 const delay = d => new Promise(r => setTimeout(r, d));
 test('Runs promises in series', () => {
-  runPromisesInSeries([() => delay(100), () => delay(200).then(() => expect(true).toBeTruthy())]);
+  return runPromisesInSeries([() => delay(100), () => delay(200)]).then(() =>
+    expect(true).toBeTruthy()
+  );
 });
diff --git a/test/sleep.test.js b/test/sleep.test.js
index 4b9beb634..32e3cff00 100644
--- a/test/sleep.test.js
+++ b/test/sleep.test.js
@@ -4,8 +4,5 @@ test('sleep is a Function', () => {
   expect(sleep).toBeInstanceOf(Function);
 });
 test('Works as expected', () => {
-  async function sleepyWork() {
-    await sleep(1000);
-    expect(true).toBeTruthy();
-  }
+  return expect(sleep(1000)).resolves.toBe(undefined);
 });