tests: added test

Author: dg

tests/Utils/DateTime.modifyClone.phpt

@@ -0,0 +1,25 @@
+<?php
+
+/**
+ * Test: Nette\DateTime::modifyClone().
+ */
+
+use Tester\Assert;
+use Nette\Utils\DateTime;
+
+require __DIR__ . '/../bootstrap.php';
+
+
+date_default_timezone_set('Europe/Prague');
+
+$date = DateTime::from(254400000);
+$dolly = $date->modifyClone();
+Assert::type(DateTime::class, $dolly);
+Assert::notSame($date, $dolly);
+Assert::same((string) $date, (string) $dolly);
+
+
+$dolly2 = $date->modifyClone('+1 hour');
+Assert::type(DateTime::class, $dolly2);
+Assert::notSame($date, $dolly2);
+Assert::notSame((string) $date, (string) $dolly2);