diff --git a/tests/Unit/RedirectLegacyCatalogRequestTest.php b/tests/Unit/RedirectLegacyCatalogRequestTest.php
new file mode 100644
index 000000000..39f8b6c85
--- /dev/null
+++ b/tests/Unit/RedirectLegacyCatalogRequestTest.php
@@ -0,0 +1,77 @@
+<?php
+
+namespace Tests\Unit;
+
+use App\Http\Middleware\RedirectLegacyCatalogRequest;
+use Illuminate\Http\Request;
+use Illuminate\Http\Response;
+use Tests\TestCase;
+
+class RedirectLegacyCatalogRequestTest extends TestCase
+{
+    // TODO move this into a 'feature test' and test the whole request
+    public function test_redirects_to_new_catalog_url(): void
+    {
+        $middleware = new RedirectLegacyCatalogRequest();
+        $legacyQuery = http_build_query([
+            'author' => 'Vodrážka, Jaroslav',
+            'work_type' => 'maliarstvo',
+            'object_type' => 'závesný obraz',
+            'tag' => 'architektúra',
+            'topic' => 'architektonický motív',
+            'technique' => 'olej',
+            'medium' => 'drevo',
+            'gallery' => 'Slovenská národná galéria, SNG',
+            'has_image' => '1',
+            'has_iip' => '1',
+            'is_free' => '1',
+            'has_text' => '1',
+            'years_range' => '1533,1912',
+            'color' => '38E619',
+            'sort_by' => 'created_at',
+        ]);
+        $request = Request::create("/katalog?$legacyQuery");
+
+        $response = $middleware->handle($request, function () {});
+
+        $expectedQuery = http_build_query([
+            'filter' => [
+                'author' => ['Vodrážka, Jaroslav'],
+                'work_type' => ['maliarstvo'],
+                'object_type' => ['závesný obraz'],
+                'tag' => ['architektúra'],
+                'topic' => ['architektonický motív'],
+                'technique' => ['olej'],
+                'medium' => ['drevo'],
+                'gallery' => ['Slovenská národná galéria, SNG'],
+                'has_image' => 'true',
+                'has_iip' => 'true',
+                'is_free' => 'true',
+                'has_text' => 'true',
+                'late_latest' => ['gte' => '1533'],
+                'date_earliest' => ['lte' => '1912'],
+                'color' => '38E619',
+                'sort' => ['created_at' => 'asc'],
+            ],
+        ]);
+
+        $this->assertEquals($response->getStatusCode(), 302);
+        $this->assertEquals(
+            $response->headers->get('location'),
+            $request->url() . '?' . $expectedQuery
+        );
+    }
+
+    public function test_ignores_new_request_format(): void
+    {
+        $middleware = new RedirectLegacyCatalogRequest();
+        $query = http_build_query([
+            'filter' => ['topic' => ['summer']],
+        ]);
+        $request = Request::create("/katalog?$query");
+
+        $response = $middleware->handle($request, fn() => new Response());
+
+        $this->assertEquals($response->getStatusCode(), 200);
+    }
+}