diff --git a/.github/workflows/unit-test.yml b/.github/workflows/unit-test.yml
index 074ce4a..1b4d135 100644
--- a/.github/workflows/unit-test.yml
+++ b/.github/workflows/unit-test.yml
@@ -38,5 +38,7 @@ jobs:
       name: Install dev dependencies
     - run: npm run lint
       name: Run linter
+    - run: npm run format:check
+      name: Run Prettier check
     - run: npm run test
       name: Run unit tests
diff --git a/package.json b/package.json
index ef769b4..657b611 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,8 @@
     "prepare": "npm run rebuild",
     "test": "mocha --exit --timeout 1m \"./test/**/*-specs.ts\"",
     "lint": "eslint .",
-    "format": "prettier -w ./lib",
+    "format": "prettier -w ./lib ./test",
+    "format:check": "prettier --check ./lib ./test",
     "watch": "npm run dev"
   },
   "prettier": {
diff --git a/test/asyncbox-specs.ts b/test/asyncbox-specs.ts
index d336124..3298d4f 100644
--- a/test/asyncbox-specs.ts
+++ b/test/asyncbox-specs.ts
@@ -41,7 +41,15 @@ describe('longSleep', function () {
     let curElapsed = 0;
     let curTimeLeft = 10000;
     let curProgress = 0;
-    const progressCb = function ({elapsedMs, timeLeft, progress}: {elapsedMs: number, timeLeft: number, progress: number}) {
+    const progressCb = function ({
+      elapsedMs,
+      timeLeft,
+      progress,
+    }: {
+      elapsedMs: number;
+      timeLeft: number;
+      progress: number;
+    }) {
       expect(elapsedMs).to.be.above(curElapsed);
       expect(timeLeft).to.be.below(curTimeLeft);
       expect(progress).to.be.above(curProgress);
@@ -173,7 +181,7 @@ describe('retry', function () {
 describe('waitForCondition', function () {
   it('should wait and succeed', async function () {
     const ref = Date.now();
-    function condFn (): boolean {
+    function condFn(): boolean {
       return Date.now() - ref > 200;
     }
     const result = await waitForCondition(condFn, {waitMs: 1000, intervalMs: 10});
@@ -184,7 +192,7 @@ describe('waitForCondition', function () {
   });
   it('should wait and fail', async function () {
     const ref = Date.now();
-    function condFn (): boolean {
+    function condFn(): boolean {
       return Date.now() - ref > 200;
     }
     try {
@@ -196,7 +204,7 @@ describe('waitForCondition', function () {
   });
   it('should reduce interval to not exceed timeout', async function () {
     const ref = Date.now();
-    function condFn (): boolean {
+    function condFn(): boolean {
       return Date.now() - ref > 25;
     }
     await waitForCondition(condFn, {waitMs: 30, intervalMs: 20});
@@ -241,9 +249,7 @@ describe('asyncmap', function () {
   });
   it('should raise an error if options is null', async function () {
     // @ts-expect-error - testing invalid inputs
-    await expect(asyncmap(coll, mapper, null)).to.be.rejectedWith(
-      'Options cannot be null'
-    );
+    await expect(asyncmap(coll, mapper, null)).to.be.rejectedWith('Options cannot be null');
   });
 });
 
@@ -283,8 +289,6 @@ describe('asyncfilter', function () {
   });
   it('should raise an error if options is null', async function () {
     // @ts-expect-error - testing invalid inputs
-    await expect(asyncfilter(coll, filter, null)).to.be.rejectedWith(
-      'Options cannot be null'
-    );
+    await expect(asyncfilter(coll, filter, null)).to.be.rejectedWith('Options cannot be null');
   });
 });