AC-952: Create unit test for Magento2\Less\SemicolonSpacingSniff check

Author: loginesta

Magento2/Tests/Less/SemicolonSpacingUnitTest.less

@@ -0,0 +1,13 @@
+// /**
+//  * Copyright © Magento, Inc. All rights reserved.
+//  * See COPYING.txt for license details.
+//  */
+
+.nav {
+  background-color: green
+}
+
+.bar {
+  background-color: red
+  color: white
+}

Magento2/Tests/Less/SemicolonSpacingUnitTest.php

@@ -0,0 +1,27 @@
+<?php
+/**
+ * Copyright © Magento. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+namespace Magento2\Tests\Less;
+
+class SemicolonSpacingUnitTest extends AbstractLessSniffUnitTestCase
+{
+    /**
+     * @inheritdoc
+     */
+    public function getErrorList()
+    {
+        return [
+            11 => 1
+        ];
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function getWarningList()
+    {
+        return [];
+    }
+}