diff --git a/packages/mjml/test/html-attributes.test.js b/packages/mjml/test/html-attributes.test.js
index 5adb1696a..0483cca42 100755
--- a/packages/mjml/test/html-attributes.test.js
+++ b/packages/mjml/test/html-attributes.test.js
@@ -3,7 +3,8 @@ const { load } = require('cheerio')
 const { sortBy } = require('lodash')
 const mjml = require('../lib')
 
-const input = `
+async function run() {
+  const input = `
 <mjml>
   <mj-head>
     <mj-html-attributes>
@@ -35,44 +36,49 @@ const input = `
 </mjml>
 `
 
-const { html } = mjml(input)
-const $ = load(html)
+  const { html } = await mjml(input)
+  const $ = load(html)
 
-// should put the attributes at the right place
-chai
-  .expect(
-    $('.text div')
-      .map(function getAttr() {
-        return $(this).attr('data-id')
-      })
-      .get(),
-    'Custom attributes added on texts',
-  )
-  .to.eql(['42', '42'])
+  // should put the attributes at the right place
+  chai
+    .expect(
+      $('.text div')
+        .map(function getAttr() {
+          return $(this).attr('data-id')
+        })
+        .get(),
+      'Custom attributes added on texts',
+    )
+    .to.eql(['42', '42'])
 
-chai
-  .expect(
-    $('.image td')
-      .map(function getAttr() {
-        return $(this).attr('data-name')
-      })
-      .get(),
-    'Custom attributes added on image',
-  )
-  .to.eql(['43'])
+  chai
+    .expect(
+      $('.image td')
+        .map(function getAttr() {
+          return $(this).attr('data-name')
+        })
+        .get(),
+      'Custom attributes added on image',
+    )
+    .to.eql(['43'])
 
-// should not alter templating syntax, or move the content that is outside any tag (mj-raws)
-const expected = [
-  '{ if item < 5 }',
-  'class="section"',
-  '{ if item > 10 }',
-  'class="text"',
-  '{ item }',
-  '{ end if }',
-  '{ item + 1 }',
-]
-const indexes = expected.map((str) => html.indexOf(str))
+  // should not alter templating syntax, or move the content that is outside any tag (mj-raws)
+  const expected = [
+    '{ if item < 5 }',
+    'class="section"',
+    '{ if item > 10 }',
+    'class="text"',
+    '{ item }',
+    '{ end if }',
+    '{ item + 1 }',
+  ]
+  const indexes = expected.map((str) => html.indexOf(str))
 
-chai.expect(indexes, 'Templating syntax unaltered').to.not.include(-1)
+  chai.expect(indexes, 'Templating syntax unaltered').to.not.include(-1)
 
-chai.expect(sortBy(indexes), 'Mj-raws kept same positions').to.deep.eql(indexes)
+  chai
+    .expect(sortBy(indexes), 'Mj-raws kept same positions')
+    .to.deep.eql(indexes)
+}
+
+run()
diff --git a/packages/mjml/test/lazy-head-style.test.js b/packages/mjml/test/lazy-head-style.test.js
index ad489a677..f7dfaadd2 100644
--- a/packages/mjml/test/lazy-head-style.test.js
+++ b/packages/mjml/test/lazy-head-style.test.js
@@ -1,46 +1,49 @@
 const chai = require('chai')
 const spies = require('chai-spies')
 const mjml = require('../lib')
-
-chai.use(spies)
-
 const {
   HeadComponent,
   registerComponent,
 } = require('../../mjml-core/lib/index')
 
-const addStyle = chai.spy(
-  (breakpoint) => `
-    @media only screen and (max-width:${breakpoint}) {
-      h1 {
-        font-size: 20px;
+async function run() {
+  chai.use(spies)
+
+  const addStyle = chai.spy(
+    (breakpoint) => `
+      @media only screen and (max-width:${breakpoint}) {
+        h1 {
+          font-size: 20px;
+        }
       }
-    }
-  `,
-)
+    `,
+  )
 
-class HeadComponentWithFunctionStyle extends HeadComponent {
-  handler() {
-    const { add } = this.context
-    add('style', addStyle)
+  class HeadComponentWithFunctionStyle extends HeadComponent {
+    handler() {
+      const { add } = this.context
+      add('style', addStyle)
+    }
   }
+  HeadComponentWithFunctionStyle.componentName =
+    'mj-head-component-with-function-style'
+  HeadComponentWithFunctionStyle.endingTag = true
+  HeadComponentWithFunctionStyle.allowedAttributes = {}
+
+  registerComponent(HeadComponentWithFunctionStyle)
+
+  mjml(`
+  <mjml>
+    <mj-head>
+      <mj-head-component-with-function-style />
+      <mj-breakpoint width="300px" />
+    </mj-head>
+    <mj-body>
+    </mj-body>
+  </mjml>
+  `)
+
+  chai.expect(addStyle).to.have.been.called.with('300px')
 }
-HeadComponentWithFunctionStyle.componentName = 'mj-head-component-with-function-style'
-HeadComponentWithFunctionStyle.endingTag = true
-HeadComponentWithFunctionStyle.allowedAttributes = {}
-
-
-registerComponent(HeadComponentWithFunctionStyle)
-
-mjml(`
-<mjml>
-  <mj-head>
-    <mj-head-component-with-function-style />
-    <mj-breakpoint width="300px" />
-  </mj-head>
-  <mj-body>
-  </mj-body>
-</mjml>
-`)
 
-chai.expect(addStyle).to.have.been.called.with('300px')
+run()