diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index fc1c17f..a3107ea 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,24 +7,24 @@ on:
     tags: [ 'v[0-9]+.[0-9]+.[0-9]+' ]
 
 jobs:
-# temporarily disabled
-#  test:
-#    runs-on: ubuntu-latest
-#    steps:
-#      - uses: actions/checkout@v2
-#      - uses: actions/setup-node@v1
-#        with:
-#          node-version: 14.7.0
-#      - run: yarn
-#      - run: yarn test
-#      - name: Telegram Failure Notification
-#        uses: appleboy/telegram-action@0.0.7
-#        if: failure()
-#        with:
-#          message: ❗ Build failed for [${{ github.repository }}](https://github.com/${{ github.repository }}/actions) because of ${{ github.actor }}
-#          format: markdown
-#          to: ${{ secrets.TELEGRAM_CHAT_ID }}
-#          token: ${{ secrets.TELEGRAM_BOT_TOKEN }}
+  # temporarily disabled
+  #  test:
+  #    runs-on: ubuntu-latest
+  #    steps:
+  #      - uses: actions/checkout@v2
+  #      - uses: actions/setup-node@v1
+  #        with:
+  #          node-version: 14.7.0
+  #      - run: yarn
+  #      - run: yarn test
+  #      - name: Telegram Failure Notification
+  #        uses: appleboy/telegram-action@0.0.7
+  #        if: failure()
+  #        with:
+  #          message: ❗ Build failed for [${{ github.repository }}](https://github.com/${{ github.repository }}/actions) because of ${{ github.actor }}
+  #          format: markdown
+  #          to: ${{ secrets.TELEGRAM_CHAT_ID }}
+  #          token: ${{ secrets.TELEGRAM_BOT_TOKEN }}
 
   lint:
     runs-on: ubuntu-latest
diff --git a/package.json b/package.json
index 4009b6f..95d61f0 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,10 @@
   "description": "",
   "main": "index.js",
   "scripts": {
-    "lint": "eslint .",
+    "eslint": "eslint --ext .js --ignore-path .gitignore .",
+    "prettier:check": "npx prettier --check . --config .prettierrc",
+    "prettier:fix": "npx prettier --write . --config .prettierrc",
+    "lint": "yarn eslint && yarn prettier:check",
     "test": "mocha --timeout 300000"
   },
   "keywords": [],
diff --git a/src/utils.js b/src/utils.js
index 88abbbf..e8fdeb7 100644
--- a/src/utils.js
+++ b/src/utils.js
@@ -1,7 +1,7 @@
 /**
  * A promise that resolves after `ms` milliseconds
  */
-const sleep = (ms) => new Promise((res) => setTimeout(res, ms))
+const sleep = ms => new Promise(res => setTimeout(res, ms))
 
 /**
  * A promise that resolves when the source emits specified event
diff --git a/test/TxManager.test.js b/test/TxManager.test.js
index 202a99d..0f84348 100644
--- a/test/TxManager.test.js
+++ b/test/TxManager.test.js
@@ -32,9 +32,9 @@ describe('TxManager', () => {
 
       const receipt = await tx
         .send()
-        .on('transactionHash', (hash) => console.log('hash', hash))
-        .on('mined', (receipt) => console.log('Mined in block', receipt.blockNumber))
-        .on('confirmations', (confirmations) => console.log('confirmations', confirmations))
+        .on('transactionHash', hash => console.log('hash', hash))
+        .on('mined', receipt => console.log('Mined in block', receipt.blockNumber))
+        .on('confirmations', confirmations => console.log('confirmations', confirmations))
 
       console.log('receipt', receipt)
     })
@@ -46,9 +46,9 @@ describe('TxManager', () => {
 
       const receipt = await tx
         .send()
-        .on('transactionHash', (hash) => console.log('hash', hash))
-        .on('mined', (receipt) => console.log('Mined in block', receipt.blockNumber))
-        .on('confirmations', (confirmations) => console.log('confirmations', confirmations))
+        .on('transactionHash', hash => console.log('hash', hash))
+        .on('mined', receipt => console.log('Mined in block', receipt.blockNumber))
+        .on('confirmations', confirmations => console.log('confirmations', confirmations))
 
       console.log('receipt', receipt)
     })
@@ -60,9 +60,9 @@ describe('TxManager', () => {
 
       const receipt = await tx
         .send()
-        .on('transactionHash', (hash) => console.log('hash', hash))
-        .on('mined', (receipt) => console.log('Mined in block', receipt.blockNumber))
-        .on('confirmations', (confirmations) => console.log('confirmations', confirmations))
+        .on('transactionHash', hash => console.log('hash', hash))
+        .on('mined', receipt => console.log('Mined in block', receipt.blockNumber))
+        .on('confirmations', confirmations => console.log('confirmations', confirmations))
 
       console.log('receipt', receipt)
     })