[ticket/11323] Add tests for inclusion of defined variables

This adds 2 tests for the template engine. The test using
include_define_variable.html will test if a defined variable, which was
defined with another template variable, can be used to include a file.
The second test will do the same inside a loop using a loop variable.

PHPBB3-11323

tests/template/template_test.php

@@ -238,7 +238,22 @@ class phpbb_template_template_test extends phpbb_test_case
 				array('loop' => array(array('VARIABLE' => 'x'), array('VARIABLE' => 'y')), 'loop.inner' => array(array(), array())),
 				array('loop'),
 				'',
-			),/* no top level nested loops
+			),
+			array(
+				'include_define_variable.html',
+				array('VARIABLE' => 'variable.html'),
+				array(),
+				array(),
+				'variable.html',
+			),
+			array(
+				'include_loop_define.html',
+				array('VARIABLE' => 'value'),
+				array('loop' => array(array('NESTED_FILE' => 'variable.html'))),
+				array(),
+				'value',
+			),
+			/* no top level nested loops
 			array(
 				'loop_vars.html',
 				array(),

tests/template/templates/include_define_variable.html

@@ -0,0 +1,2 @@
+<!-- DEFINE $DEF = '{VARIABLE}' -->
+<!-- INCLUDE {$DEF} -->

tests/template/templates/include_loop_define.html

@@ -0,0 +1,4 @@
+<!-- BEGIN loop -->
+<!-- DEFINE $DEF = '{loop.NESTED_FILE}' -->
+<!-- INCLUDE {$DEF} -->
+<!-- END loop -->