add unit macro tests

tests/Pest.php

@@ -1,3 +1,3 @@
 <?php
 
-uses(Tests\TestCase::class)->in('Integration');
+uses(Tests\TestCase::class)->in('Unit', 'Integration');

tests/Integration/MacroTest.php → tests/Unit/MacroTest.php

@@ -1,6 +1,23 @@
 <?php
 
-it('returns multidimensional array if no methods where chained')->todo();
+use Tests\TestComponent;
+use Leuverink\PropertyAttribute\Group;
+
+use function Leuverink\PropertyAttribute\group;
+
+it('returns multidimensional array if no methods where chained', function () {
+    $component = new class extends TestComponent
+    {
+        #[Group('a')]
+        public $foo = 1;
+    };
+
+    expect(group($component, 'a'))
+        ->toBe([
+            'foo' => 1,
+        ]);
+});
+
 it('returns array keys when keys() method was chained')->todo();
 it('returns array values when values() method was chained')->todo();
 it('has no unexpected side effects if both keys() and values() are called in the same chain')->todo();