change timestamp of function mock return value

Author: gregor-j

tests/SapRfcFunctionTest.php

@@ -173,7 +173,7 @@ protected function mockRemoteFunctionCallWithParametersAndResults()
                 'EV_MONTH'          => '11',
                 'EV_MONTH_LAST_DAY' => '20181130',
                 'EV_MONTXT'         => 'Montag',
-                'EV_TIMESTAMP'      => 'NOVALUE',
+                'EV_TIMESTAMP'      => '20181119000000',
                 'EV_WEEK'           => '201847',
                 'EV_WEEK_LAST'      => '201846',
                 'EV_WEEK_NEXT'      => '201848',