diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 508281cb9..8d5987d60 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,6 +16,7 @@ jobs:
           - 7.4
           - 8.0
           - 8.1
+          - 8.2
 
     steps:
       - uses: actions/checkout@v2
@@ -39,3 +40,4 @@ jobs:
       - run: composer run test
 
       - run: composer run lint -- --dry-run
+        if: ${{ matrix.php <= '8.0' }}
diff --git a/composer.json b/composer.json
index d92bca26b..983b3ca81 100644
--- a/composer.json
+++ b/composer.json
@@ -13,6 +13,7 @@
         "doctrine/orm": "^2.7"
     },
     "require-dev": {
+        "doctrine/cache": "^1.11",
         "friendsofphp/php-cs-fixer": "^2.14",
         "nesbot/carbon": "*",
         "phpunit/phpunit": "^7.0 || ^8.0 || ^9.0",
diff --git a/src/Query/Mysql/CharLength.php b/src/Query/Mysql/CharLength.php
index cdc3c0a8e..59dc68389 100644
--- a/src/Query/Mysql/CharLength.php
+++ b/src/Query/Mysql/CharLength.php
@@ -10,7 +10,7 @@
  */
 class CharLength extends FunctionNode
 {
-    private $expr;
+    private $expr1;
 
     public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker): string
     {
diff --git a/src/Query/Mysql/Power.php b/src/Query/Mysql/Power.php
index c1dbe27c0..bc900c55e 100644
--- a/src/Query/Mysql/Power.php
+++ b/src/Query/Mysql/Power.php
@@ -9,6 +9,8 @@ class Power extends FunctionNode
 {
     public $arithmeticExpression;
 
+    public $power;
+
     public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker): string
     {
         return 'POWER(' . $this->arithmeticExpression->dispatch($sqlWalker) . ', '
diff --git a/src/Query/Sqlite/ConcatWs.php b/src/Query/Sqlite/ConcatWs.php
index 02229c7ba..d414219ce 100644
--- a/src/Query/Sqlite/ConcatWs.php
+++ b/src/Query/Sqlite/ConcatWs.php
@@ -63,7 +63,7 @@ public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker): string
         // Iterate over the captured expressions and add them to the query.
         for ($i = 1; $i < count($this->values); $i++) {
             if ($i > 1) {
-                $queryBuilder[] = " || '${separator}' || ";
+                $queryBuilder[] = " || '{$separator}' || ";
             }
 
             // Dispatch the walker on the current node.
diff --git a/tests/Entities/CarbonDate.php b/tests/Entities/CarbonDate.php
index af7d81450..65d3b6fe5 100644
--- a/tests/Entities/CarbonDate.php
+++ b/tests/Entities/CarbonDate.php
@@ -33,4 +33,24 @@ class CarbonDate
      * @Column(type="CarbonTime", nullable=true)
      */
     public $time;
+
+    /**
+     * @Column(type="CarbonImmutableDate", nullable=true)
+     */
+    public $date_immutable;
+
+    /**
+     * @Column(type="CarbonImmutableDateTime", nullable=true)
+     */
+    public $datetime_immutable;
+
+    /**
+     * @Column(type="CarbonImmutableDateTimeTz", nullable=true)
+     */
+    public $datetime_tz_immutable;
+
+    /**
+     * @Column(type="CarbonImmutableTime", nullable=true)
+     */
+    public $time_immutable;
 }
diff --git a/tests/Query/Mysql/TrigTest.php b/tests/Query/Mysql/TrigTest.php
index be9971df2..7c1e6afc9 100644
--- a/tests/Query/Mysql/TrigTest.php
+++ b/tests/Query/Mysql/TrigTest.php
@@ -4,6 +4,8 @@
 
 class TrigTest extends \DoctrineExtensions\Tests\Query\MysqlTestCase
 {
+    private $entity;
+
     public function setUp(): void
     {
         parent::setUp();
diff --git a/tests/Types/CarbonDateTest.php b/tests/Types/CarbonDateTest.php
index cd366e4b8..a1d32bd42 100755
--- a/tests/Types/CarbonDateTest.php
+++ b/tests/Types/CarbonDateTest.php
@@ -16,7 +16,7 @@
  */
 class CarbonDateTest extends TestCase
 {
-    public $entityManager = null;
+    private $em;
 
     public static function setUpBeforeClass(): void
     {
diff --git a/tests/Types/ZendDateTest.php b/tests/Types/ZendDateTest.php
index 531885348..5e133b1a3 100755
--- a/tests/Types/ZendDateTest.php
+++ b/tests/Types/ZendDateTest.php
@@ -12,7 +12,7 @@
  */
 class ZendDateTest extends TestCase
 {
-    public $entityManager = null;
+    private $em;
 
     public static function setUpBeforeClass(): void
     {