update project

tests/Architecture/DeprecationPolicyTest.php

@@ -0,0 +1,18 @@
+<?php declare(strict_types=1);
+
+namespace Tests\Architecture;
+
+use PHPUnit\Framework\TestCase;
+
+final class DeprecationPolicyTest extends TestCase
+{
+    public function test_deprecation_document_exists_with_required_metadata_headings(): void
+    {
+        $path = dirname(__DIR__, 2).'/docs/deprecations.md';
+        $this->assertFileExists($path);
+        $contents = file_get_contents($path) ?: '';
+        foreach (['replacement_route', 'sunset_date', 'owner', 'removal_ticket'] as $required) {
+            $this->assertStringContainsString($required, $contents);
+        }
+    }
+}