test: add tests for Ds\Collection normalization

.github/workflows/mutation.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       php-version: '8.1'
-      php-extensions: yaml
+      php-extensions: ds,yaml
     steps:
       - name: Checkout
         uses: actions/checkout@v3

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
           - "8.3"
 
     env:
-      php-extensions: yaml
+      php-extensions: ds,yaml
     steps:
       - name: Checkout
         uses: actions/checkout@v3

tests/Integration/Normalizer/NormalizerTest.php

@@ -203,6 +203,24 @@ public static function normalize_basic_values_yields_expected_output_data_provid
             'expected json' => '{"foo":"foo","bar":"bar"}',
         ];
 
+        yield 'Ds Map' => [
+            'input' => new \Ds\Map(['foo' => 'foo', 'bar' => 'bar']),
+            'expected array' => [
+                'foo' => 'foo',
+                'bar' => 'bar',
+            ],
+            'expected json' => '{"foo":"foo","bar":"bar"}',
+        ];
+
+        yield 'Ds Set' => [
+            'input' => new \Ds\Set(['foo', 'bar']),
+            'expected array' => [
+                0 => 'foo',
+                1 => 'bar',
+            ],
+            'expected json' => '["foo","bar"]',
+        ];
+
         yield 'class inheriting ArrayObject' => [
             'input' => new class (['foo' => 'foo', 'bar' => 'bar']) extends ArrayObject {},
             'expected array' => [