Add adapter for image variations

src/EventListener/ImageVariations/Database/PostgreSQL.php

@@ -0,0 +1,13 @@
+<?php declare(strict_types=1);
+namespace Imbo\EventListener\ImageVariations\Database;
+
+/**
+ * PostgreSQL database adapter for the image variations
+ */
+class PostgreSQL extends PDOAdapter
+{
+    protected function getIdentifierQuote(): string
+    {
+        return '"';
+    }
+}

tests/EventListener/ImageVariations/Database/PostgreSQLIntegrationTest.php

@@ -0,0 +1,32 @@
+<?php declare(strict_types=1);
+namespace Imbo\EventListener\ImageVariations\Database;
+
+use PDO;
+
+/**
+ * @coversDefaultClass Imbo\EventListener\ImageVariations\Database\PostgreSQL
+ */
+class PostgreSQLIntegrationTest extends DatabaseTests
+{
+    protected function getAdapter(): PostgreSQL
+    {
+        return new PostgreSQL(
+            (string) getenv('DB_DSN'),
+            (string) getenv('DB_USERNAME'),
+            (string) getenv('DB_PASSWORD'),
+        );
+    }
+
+    protected function setUp(): void
+    {
+        parent::setUp();
+
+        $pdo = new PDO(
+            (string) getenv('DB_DSN'),
+            (string) getenv('DB_USERNAME'),
+            (string) getenv('DB_PASSWORD'),
+        );
+
+        $pdo->query(sprintf('DELETE FROM "%s"', PostgreSQL::IMAGEVARIATIONS_TABLE));
+    }
+}