diff --git a/.github/workflows/build-website.yml b/.github/workflows/build-website.yml
index de0b1e629..bb1855cc7 100644
--- a/.github/workflows/build-website.yml
+++ b/.github/workflows/build-website.yml
@@ -10,13 +10,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v3
-      - run: echo ::set-output name=NVMRC::$(cat .nvmrc)
-        id: nvm
 
       - uses: actions/setup-node@v3.5.1
-        id: setup-node
         with:
-          node-version: "${{ steps.nvm.outputs.NVMRC }}"
+          node-version-file: ".nvmrc"
           cache: yarn
           cache-dependency-path: website/yarn.lock
 
diff --git a/.github/workflows/continuous-integration.yml b/.github/workflows/continuous-integration.yml
index b0e0f6681..4555ffe39 100644
--- a/.github/workflows/continuous-integration.yml
+++ b/.github/workflows/continuous-integration.yml
@@ -32,7 +32,7 @@ jobs:
 
       - name: ♻️ Get composer cache directory
         id: composer-cache
-        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+        run: echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
 
       - name: ♻️ Cache composer dependencies
         uses: actions/cache@v3
diff --git a/README.md b/README.md
index 4f27f0f6f..07aad0845 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@
 
 ## Demonstration / example
 
-🚀 Render **ALL** of the [Twitter Bootstrap v5+](https://getbootstrap.com/) elements with TwbsHelper : [see it in action, on-line](https://neilime.github.io/twbs-helper-module/#/usage/?id=rendering).
+🚀 Render **ALL** of the [Twitter Bootstrap v5+](https://getbootstrap.com/) elements with TwbsHelper : [see it in action, on-line](https://neilime.github.io/twbs-helper-module/docs/usage/intro/).
 
 ## Documentation
 
diff --git a/composer.json b/composer.json
index 10ace24dc..65527ba00 100644
--- a/composer.json
+++ b/composer.json
@@ -46,7 +46,7 @@
     "phpstan/extension-installer": "^1.1",
     "phpstan/phpstan": "^0.12",
     "phpstan/phpstan-phpunit": "^0.12",
-    "phpunit/phpunit": "^9.5.25",
+    "phpunit/phpunit": "^9.5.26",
     "slam/phpstan-laminas-framework": "^0.12",
     "spatie/phpunit-snapshot-assertions": "^4.2",
     "squizlabs/php_codesniffer": "^3.7"
diff --git a/tests/TestSuite/TwbsHelper/View/HtmlStyleAttributeSetTest.php b/tests/TestSuite/TwbsHelper/View/HtmlStyleAttributeSetTest.php
new file mode 100644
index 000000000..2a1dab1a9
--- /dev/null
+++ b/tests/TestSuite/TwbsHelper/View/HtmlStyleAttributeSetTest.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace TestSuite\TwbsHelper\View;
+
+class HtmlStyleAttributeSetTest extends \PHPUnit\Framework\TestCase
+{
+    /**
+     * @var \\Laminas\View\Renderer\PhpRenderer
+     */
+    protected $phpRenderer;
+
+    protected function setUp(): void
+    {
+        $viewHelperPluginManager = \TestSuite\Bootstrap::getServiceManager()->get('ViewHelperManager');
+        $this->phpRenderer = new \Laminas\View\Renderer\PhpRenderer();
+        $this->phpRenderer->setHelperPluginManager($viewHelperPluginManager);
+    }
+
+    public function testToString()
+    {
+        $htmlStyleAttributeSet = new \TwbsHelper\View\HtmlStyleAttributeSet([
+            'width' => '50%',
+            'color' => 'red',
+        ]);
+
+        $this->assertSame(
+            'color: red; width: 50%;',
+            $htmlStyleAttributeSet->__toString()
+        );
+    }
+
+    public function testMerge()
+    {
+        $htmlStyleAttributeSet = new \TwbsHelper\View\HtmlStyleAttributeSet([
+            'width' => '50%',
+            'color' => 'red',
+        ]);
+
+        $htmlStyleAttributeSet->merge([
+            'width' => '50%',
+            'color' => 'green',
+            'height' => '100%',
+        ]);
+
+        $this->assertSame(
+            [
+                'color' => 'green',
+                'height' => '100%',
+                'width' => '50%',
+            ],
+            $htmlStyleAttributeSet->getArrayCopy()
+        );
+    }
+}