o.O forget to add test case

tests/003-advanced-enabled-extensions.phpt

@@ -0,0 +1,126 @@
+--TEST--
+Check for determine enabled extensions.
+--SKIPIF--
+<?php if (!extension_loaded("sundown")) print "skip"; ?>
+--FILE--
+<?php
+$render = new Sundown\Render\HTML();
+
+$markdown = new Sundown\Markdown($render, array());
+$extensions = array("no_intraemphasis","tables","fenced_code_blocks","autolink","strikethrough","lax_html_blocks","space_after_header","superscript");
+
+$enabled = array();
+foreach ($extensions as $ext) {
+  $enabled[$ext] = true;
+}
+
+echo "default: all extensions are disabled\n";
+foreach ($extensions as $ext) {
+	var_dump($markdown->hasExtension($ext));
+}
+
+echo "enabled all:\n";
+$markdown = new Sundown\Markdown($render, $enabled);
+foreach ($extensions as $ext) {
+	var_dump($markdown->hasExtension($ext));
+}
+
+foreach ($extensions as $ext) {
+	echo "only {$ext}:\n";
+	$markdown = new Sundown\Markdown($render, array($ext => true));
+	foreach ($extensions as $ext2) {
+		var_dump($markdown->hasExtension($ext2));
+	}
+}
+
+--EXPECT--
+default: all extensions are disabled
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+enabled all:
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+bool(true)
+only no_intraemphasis:
+bool(true)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+only tables:
+bool(false)
+bool(true)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+only fenced_code_blocks:
+bool(false)
+bool(false)
+bool(true)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+only autolink:
+bool(false)
+bool(false)
+bool(false)
+bool(true)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+only strikethrough:
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(true)
+bool(false)
+bool(false)
+bool(false)
+only lax_html_blocks:
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(true)
+bool(false)
+bool(false)
+only space_after_header:
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(true)
+bool(false)
+only superscript:
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(false)
+bool(true)