Start adding SQLite database access

tests/Gateways/SqliteGatewayTest.php

@@ -0,0 +1,47 @@
+<?php
+
+declare(strict_types=1);
+error_reporting(E_ALL); ini_set('display_errors',1);
+
+
+use Lewisdale\Webmentions\Gateways\SqliteGateway;
+use Lewisdale\Webmentions\Models\Webmention;
+use PHPUnit\Framework\TestCase;
+
+class SqliteGatewayTest extends TestCase
+{
+    public function testCanInsertAWebmention()
+    {
+        $gateway = new SqliteGateway(":memory:");
+
+        $webmention = new Webmention(
+            null,
+            "https://lewisdale.dev/post/a-post",
+            "https://a-source.url",
+            "No content",
+            "Some Author Name"
+        );
+
+        $webmention->id = $gateway->save($webmention);
+        $this->assertNotNull($webmention->id);
+    }
+
+    public function testCanRetrieveAWebmention()
+    {
+        $gateway = new SqliteGateway(":memory:");
+
+        $webmention = new Webmention(
+            null,
+            "https://lewisdale.dev/post/a-post",
+            "https://a-source.url",
+            "No content",
+            "Some Author Name"
+        );
+
+        $webmention->id = $gateway->save($webmention);
+
+        $retrieved = $gateway->get($webmention->id);
+
+        $this->assertEquals($webmention, $retrieved, ((string) $webmention). " " . ((string) $retrieved));
+    }
+}