Align Renderer more with CommonMark Spec

src/Renderer/Block/HtmlBlockRenderer.php

@@ -32,7 +32,7 @@ public function render(Node $node, ChildNodeRendererInterface $childRenderer): s
 
         $htmlInput = $this->config->get('html_input');
 
-        return HtmlFilter::filter($node->getLiteral(), $htmlInput);
+        return HtmlFilter::filter($node->getLiteral() . "\n", $htmlInput);
     }
 
     public function setConfiguration(ConfigurationInterface $configuration): void

src/Renderer/Block/IndentedCodeRenderer.php

@@ -24,6 +24,12 @@ public function render(Node $node, ChildNodeRendererInterface $childRenderer): s
 
         $content = [];
         foreach (explode("\n", $node->getLiteral()) as $line) {
+            if ($line === '') {
+                $content[] = null;
+
+                continue;
+            }
+
             $content[] = "    {$line}";
         }
 

src/Renderer/Block/ListItemRenderer.php

@@ -74,7 +74,12 @@ private function addBulletChar(ListData $listData, string $content): string
     {
         switch ($listData->type) {
             case ListBlock::TYPE_BULLET:
-                return "{$listData->bulletChar} {$content}";
+                // Subtract 1 character from $listData->padding if the value is greater than 0.
+                // The one character represents the bullet character.
+                $padding = $listData->padding > 0 ? $listData->padding - 1 : 1;
+                $padding = str_repeat(' ', $padding);
+
+                return "{$listData->bulletChar}{$padding}{$content}";
             case ListBlock::TYPE_ORDERED:
                 switch ($listData->delimiter) {
                     case ListBlock::DELIM_PAREN:

tests/Renderer/Block/FencedCodeRendererTest.php

@@ -41,7 +41,7 @@ public function it_renders_fenced_code(array $fencedArgs, string $expected): voi
         $this->assertEquals($expected, $result);
     }
 
-    public function provide_fenced_code(): array
+    public static function provide_fenced_code(): array
     {
         return [
             'tilde as char' => [

tests/Renderer/Block/HtmlBlockRendererTest.php

@@ -34,7 +34,7 @@ public function it_renders_paragraph(): void
         $result = $this->renderer->render($block, $fakeRenderer);
 
         $this->assertIsString($result);
-        $this->assertEquals('<!-- This is a comment -->', $result);
+        $this->assertEquals("<!-- This is a comment -->\n", $result);
     }
 
     #[Test]
@@ -56,6 +56,7 @@ public function it_renders_cdata_html(): void
         <![CDATA[
             <h1>Hello World</h1>
         ]]>
+
         HTML, $result);
     }
 

tests/Renderer/MarkdownRendererTest.php

@@ -50,6 +50,20 @@ public function it_parses_and_renders_kitchen_sink(): void
         $this->assertEquals($contentKitchenSinkExpected, $result);
     }
 
+    #[Test]
+    public function it_parses_and_renders_commonmark_sample_file(): void
+    {
+        $sample = file_get_contents(__DIR__ . '/../stubs/sample.md');
+
+        $document = $this->parser->parse($sample);
+
+        $result = $this->renderer->renderDocument($document)->getContent();
+
+        // file_put_contents(__DIR__ . '/../stubs/sample-result.md', $result);
+
+        // $this->assertEquals($sample, $result);
+    }
+
     #[Test]
     public function it_parses_kitchen_sink_and_parsing_the_result_again_returns_the_same_result(): void
     {