Initial SQLite development (#1)

Reviewed-on: #1

tests/unit/Mapper/CountMapperTest.php

@@ -0,0 +1,17 @@
+<?php declare(strict_types=1);
+
+namespace Test\Unit\Mapper;
+
+use BitBadger\PDODocument\Mapper\CountMapper;
+use PHPUnit\Framework\TestCase;
+
+/**
+ * Unit tests for the CountMapper class
+ */
+class CountMapperTest extends TestCase
+{
+    public function testMapSucceeds(): void
+    {
+        $this->assertEquals(5, (new CountMapper())->map([5, 8, 10]), 'Count not correct');
+    }
+}