Add a couple of tests imported from PR

hnw#31

Author: Ion Bazan

tests/issue_005.phpt

@@ -0,0 +1,31 @@
+--TEST--
+Check for issue #5 (DateTime reflection)
+--SKIPIF--
+<?php
+$required_version = "5.3";
+$required_func = array("timecop_freeze");
+$required_class = array("TimecopDateTime");
+include(__DIR__."/tests-skipcheck.inc.php");
+--INI--
+date.timezone=GMT
+timecop.func_override=1
+--FILE--
+<?php
+class Test
+{
+    public function setCreatedAt(DateTime $createdAt)
+    {
+        $this->createdAt = $createdAt;
+    }
+}
+$test = new Test();
+$reflection = new ReflectionClass($test);
+$params = $reflection->getMethod('setCreatedAt')->getParameters();
+foreach ($params as $param) {
+    var_dump($param->getClass());
+}
+--EXPECT--
+object(ReflectionClass)#3 (1) {
+  ["name"]=>
+  string(8) "DateTime"
+}

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"