[ticket/11843] Added newlines and included numbers in the DEFINE vars test

Per suggestion of nickvergessen, I added newlines in the DEFINE variables with
underscores test. Now if the test fails, it's easier to spot which part is
failing. Also added a test for DEFINE variables containing numbers.

PHPBB3-11843

tests/template/template_test.php

@@ -237,7 +237,7 @@ class phpbb_template_template_test extends phpbb_template_template_test_case
 				array('VARIABLE' => 'variable.html'),
 				array(),
 				array(),
-				'variable.htmlvariable.html',
+				"variable.html\nvariable.html\nvariable.html",
 			),
 			array(
 				'include_loop_define.html',

tests/template/templates/include_define_variable.html

@@ -1,4 +1,8 @@
 <!-- DEFINE $DEF = '{VARIABLE}' -->
 <!-- INCLUDE {$DEF} -->
+
 <!-- DEFINE $DEF_WITH_UNDERSCORES = '{VARIABLE}' -->
 <!-- INCLUDE {$DEF_WITH_UNDERSCORES} -->
+
+<!-- DEFINE $DEF123 = '{VARIABLE}' -->
+<!-- INCLUDE {$DEF123} -->