Try prevent too many connections

Author: janedbal

tests/Platform/QueryResultTypeWalkerFetchTypeMatrixTest.php

@@ -2763,23 +2763,26 @@ private function performDriverTest(
 		$connectionParams = ['driver' => $driver] + $this->getConnectionParamsForDriver($driver);
 		$dql = sprintf($dqlTemplate, PlatformEntity::class);
 
-		$query = $this->getQuery($dql, $data, $connectionParams, self::CONNECTION_CONFIGS[$configName]);
+		$connection = $this->createConnection($connectionParams, self::CONNECTION_CONFIGS[$configName]);
+		$query = $this->getQuery($connection, $dql, $data);
 		$sql = $query->getSQL();
 
 		self::assertIsString($sql);
 
 		try {
 			$result = $query->getSingleResult();
+			$realResultType = ConstantTypeHelper::getTypeFromValue($result);
+			$inferredType = $this->getInferredType($query);
+
 		} catch (Throwable $e) {
 			if ($expectedInferredType === null) {
 				return;
 			}
 			throw $e;
+		} finally {
+			$connection->close();
 		}
 
-		$realResultType = ConstantTypeHelper::getTypeFromValue($result);
-		$inferredType = $this->getInferredType($query);
-
 		if ($expectedInferredType === null) {
 			self::fail(sprintf(
 				"Expected failure, but none occurred\n\nDriver: %s\nConfig: %s\nDataset: %s\nDQL: %s\nSQL: %s\nReal result: %s\nInferred type: %s\n",
@@ -2806,17 +2809,13 @@ private function performDriverTest(
 	}
 
 	/**
-	 * @param array<string, mixed> $data
 	 * @param array<string, mixed> $connectionParams
 	 * @param array<mixed> $connectionAttributes
-	 * @return Query<mixed> $query
 	 */
-	private function getQuery(
-		string $dqlTemplate,
-		array $data,
+	private function createConnection(
 		array $connectionParams,
 		array $connectionAttributes
-	): Query
+	): Connection
 	{
 		$connection = DriverManager::getConnection($connectionParams + [
 			'user' => 'root',
@@ -2827,6 +2826,19 @@ private function getQuery(
 		$nativeConnection = $this->getNativeConnection($connection);
 		$this->setupAttributes($nativeConnection, $connectionAttributes);
 
+		return $connection;
+	}
+
+	/**
+	 * @param array<string, mixed> $data
+	 * @return Query<mixed> $query
+	 */
+	private function getQuery(
+		Connection $connection,
+		string $dqlTemplate,
+		array $data
+	): Query
+	{
 		$config = new Configuration();
 		$config->setProxyNamespace('PHPstan\Doctrine\OrmMatrixProxies');
 		$config->setProxyDir('/tmp/doctrine');