[ticket/12382] Add template test for subloops inside includes

PHPBB3-12382

tests/template/template_test.php

@@ -320,6 +320,16 @@ class phpbb_template_template_test extends phpbb_template_template_test_case
 				array(),
 				"barbarbar1bar1",
 			),
+			array(
+				'loop_nested_include.html',
+				array(),
+				array(
+					'test_loop' => array(array('foo' => 'bar'), array('foo' => 'bar1')),
+					'test_loop.inner' => array(array('myinner' => 'works')),
+				),
+				array(),
+				"[bar|[bar|]][bar1|[bar1|[bar1|works]]]",
+			),
 			/* Does not pass with the current implementation.
 			array(
 				'loop_reuse.html',