added tests to check for annotations breaking things

tests/AnnotationsTest.php

@@ -0,0 +1,70 @@
+<?php declare(strict_types=1);
+
+use PHPUnit\Framework\TestCase;
+
+final class AnnotationsTest extends TestCase {
+	public function testAnnotationsDoNotBreakHeadings() : void {
+		$source = "
+# This is an H1 {.withAClass}
+## This is an H2 {.withAClass}
+### This is an H3 {.withAClass}
+#### This is an H4 {.withAClass}
+##### This is an H5 {.withAClass}
+		";
+		$target = "
+		<h1>This is an H1</h1>
+		<h2>This is an H2</h2>
+		<h3>This is an H3</h3>
+		<h4>This is an H4</h4>
+		<h5>This is an H5</h5>
+		";
+
+		[$source, $result] = createTest($source, $target);
+		$this->assertEquals($source, $result);
+	}
+
+	public function testAnnotationsDoNotBreakLists() : void {
+		$source = "
+
+* this is a list
+* with annotations {#someID}
+
+1. this is an ordered list
+	1. with an annotation {.someClass}
+
+";
+		$target = "
+		<ul>
+			<li>this is a list</li>
+			<li>with annotations</li>
+		</ul>
+		<ol>
+			<li>
+				this is an ordered list
+				<ol>
+					<li>with an annotation</li>
+				</ol>
+			</li>
+		</ol>
+		";
+
+		[$source, $result] = createTest($source, $target);
+		$this->assertEquals($source, $result);
+	}
+
+	public function testAnnotationsDoNotBreakCodeblocks() : void {
+		$source = "
+```
+		this is a code block
+``` {.someClass}
+";
+		$target = "
+		<pre>
+			<code>this is a code block</code>
+		</pre>
+		";
+
+		[$source, $result] = createTest($source, $target);
+		$this->assertEquals($source, $result);
+	}
+}