Test Markdown method returns collection of Markdown documents

packages/framework/tests/Unit/DataCollectionUnitTest.php

@@ -10,6 +10,7 @@
 use Illuminate\Filesystem\Filesystem;
 use Illuminate\Support\Collection;
 use Mockery;
+use Hyde\Markdown\Models\MarkdownDocument;
 
 /**
  * @covers \Hyde\Support\DataCollection
@@ -100,6 +101,23 @@ public function testStaticMarkdownHelperReturnsNewDataCollectionInstance()
     {
         $this->assertInstanceOf(DataCollection::class, DataCollection::markdown('foo'));
     }
+
+    public function testMarkdownMethodReturnsCollectionOfMarkdownDocuments()
+    {
+        MockableDataCollection::mockFiles([
+            'foo/bar.md' => 'bar',
+            'foo/baz.md' => 'baz',
+        ]);
+
+        $collection = MockableDataCollection::markdown('foo');
+
+        $this->assertContainsOnlyInstancesOf(MarkdownDocument::class, $collection);
+
+        $this->assertSame([
+            'bar' => 'bar',
+            'baz' => 'baz',
+        ], $collection->map(fn ($value) => (string) $value)->all());
+    }
 }
 
 class MockableDataCollection extends DataCollection