feat: add unit tests

t/09-complex.t

@@ -0,0 +1,97 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+
+use Test::More tests => 4;
+use MarkdownParser;
+
+my $parser = MarkdownParser->new();
+
+my $input = <<'EOF';
+# Title
+
+This is a paragraph with **bold** and *italic* text.
+
+- List item 1
+- List item 2
+
+[Link](http://example.com)
+EOF
+
+my $expected = <<'EOF';
+<h1>Title</h1>
+<p>This is a paragraph with <strong>bold</strong> and <em>italic</em> text.</p>
+<ul>
+<li>List item 1</li>
+<li>List item 2</li>
+</ul>
+<p><a href="http://example.com">Link</a></p>
+EOF
+
+is( $parser->parse($input), $expected, "Complex document" );
+
+$input = <<'EOF';
+## Section
+
+Paragraph one.
+
+> Blockquote here
+
+Another paragraph.
+EOF
+
+$expected = <<'EOF';
+<h2>Section</h2>
+<p>Paragraph one.</p>
+<blockquote>
+<p>Blockquote here</p>
+</blockquote>
+<p>Another paragraph.</p>
+EOF
+
+is( $parser->parse($input), $expected, "Document with blockquote" );
+
+$input = <<'EOF';
+# Code Example
+
+Here is some `inline code` and a code block:
+
+```
+function test() {
+    return true;
+}
+```
+EOF
+
+$expected = <<'EOF';
+<h1>Code Example</h1>
+<p>Here is some <code>inline code</code> and a code block:</p>
+<pre><code>
+function test() {
+    return true;
+}
+</code></pre>
+EOF
+
+is( $parser->parse($input), $expected, "Document with code" );
+
+$input = <<'EOF';
+# Header
+
+Paragraph with [link](url) and ![image](img.png).
+
+---
+
+## Another Header
+EOF
+
+$expected = <<'EOF';
+<h1>Header</h1>
+<p>Paragraph with <a href="url">link</a> and <img src="img.png" alt="image">.</p>
+<hr>
+<h2>Another Header</h2>
+EOF
+
+is( $parser->parse($input),
+    $expected, "Document with links, images, and horizontal rule" );
+