Add testcase for #30

hnw#31

Author: Ion Bazan

tests/issue_030.phpt

@@ -0,0 +1,24 @@
+--TEST--
+Check for issue #30 (DateTimeImmutable::createFromFormat with ! returns DateTime)
+--SKIPIF--
+<?php
+$required_version = "5.5";
+$required_func = array("timecop_freeze");
+$required_class = array("TimecopDateTimeImmutable");
+include(__DIR__."/tests-skipcheck.inc.php");
+--INI--
+date.timezone=GMT
+timecop.func_override=1
+--FILE--
+<?php
+$dt1 = \DateTimeImmutable::createFromFormat('!Y-m-d', '2017-10-03');
+$dt2 = \DateTimeImmutable::createFromFormat('!Y-m-d', '2017-10-03');
+var_dump(get_class($dt1));
+var_dump($dt1->format('c'));
+var_dump(get_class($dt2));
+var_dump($dt2->format('c'));
+--EXPECT--
+string(17) "DateTimeImmutable"
+string(25) "2017-10-03T00:00:00+00:00"
+string(17) "DateTimeImmutable"
+string(25) "2017-10-03T00:00:00+00:00"