Add proper cleanup in test teardown

Added a tearDown() function to the SqlQueryInterceptModuleTest, SqlQueryModuleTest, and SqlQueryTest classes. This method takes care of appropriately cleaning up the SQLite connection after each test, preventing potential issues related to connection leakage.

tests/SqlQueryInterceptModuleTest.php

@@ -14,6 +14,9 @@
 
 class SqlQueryInterceptModuleTest extends TestCase
 {
+    /** @var ExtendedPdo  */
+    private $pdo;
+
     /** @var FakeRo */
     private $fakeRo;
 
@@ -22,14 +25,14 @@ class SqlQueryInterceptModuleTest extends TestCase
 
     protected function setUp(): void
     {
-        $pdo = new ExtendedPdo('sqlite::memory:');
+        $pdo = $pdo = new ExtendedPdo('sqlite::memory:');
         $pdo->setAttribute(PDO::ATTR_STRINGIFY_FETCHES, true);
         $pdo->query('CREATE TABLE IF NOT EXISTS todo (
           id INTEGER,
           title TEXT
 )');
         $pdo->perform('INSERT INTO todo (id, title) VALUES (:id, :title) ', ['id' => 1, 'title' => 'run']);
-        $module = new class ($pdo) extends AbstractModule {
+        $module = new class ($this->pdo) extends AbstractModule {
             /** @var ExtendedPdo */
             private $pdo;
 
@@ -45,11 +48,19 @@ protected function configure()
                 $this->bind(FakeBar::class);
             }
         };
+        $this->pdo = $pdo;
         $injector = new Injector($module, __DIR__ . '/tmp');
         $this->fakeRo = $injector->getInstance(FakeRo::class);
         $this->fakeBar = $injector->getInstance(FakeBar::class);
     }
 
+    protected function tearDown(): void
+    {
+        unset($this->pdo); // This effectively closes the SQLite connection
+
+        parent::tearDown();
+    }
+
     public function testResourceObject200(): void
     {
         $response = $this->fakeRo->onGet('1');

tests/SqlQueryModuleTest.php

@@ -19,8 +19,12 @@
 
 class SqlQueryModuleTest extends TestCase
 {
+    /** @var ExtendedPdo  */
+    private $pdo;
+
     /** @var AbstractModule  */
     private $module;
+
     protected function setUp(): void
     {
         $pdo = new ExtendedPdo('sqlite::memory:');
@@ -30,7 +34,7 @@ protected function setUp(): void
           title TEXT
         
 )');
-        $this->module = new class ($pdo) extends AbstractModule {
+        $this->module = new class ($this->pdo) extends AbstractModule {
             /** @var ExtendedPdo */
             private $pdo;
 
@@ -45,6 +49,14 @@ protected function configure()
                 $this->install(new SqlQueryModule(__DIR__ . '/Fake/sql'));
             }
         };
+        $this->pdo = $pdo;
+    }
+
+    protected function tearDown(): void
+    {
+        unset($this->pdo); // This effectively closes the SQLite connection
+
+        parent::tearDown();
     }
 
     public function testProviderInject(): void

tests/SqlQueryTest.php

@@ -29,6 +29,13 @@ protected function setUp(): void
         $this->pdo = $pdo;
     }
 
+    protected function tearDown(): void
+    {
+        unset($this->pdo); // This effectively closes the SQLite connection
+
+        parent::tearDown();
+    }
+
     public function testInvoke(): void
     {
         $sql = (string) file_get_contents(__DIR__ . '/Fake/sql/todo_item_by_id.sql');