Include testdate.h before catch.hpp in unit tests

This ensures that dates are printed out correctly if comparing them
fails.

It might be better to avoid always including this header, but this is
the simplest solution.

tests/datetime/datetimetest.cpp

@@ -24,8 +24,6 @@
 
 #include "wx/wxcrt.h"       // for wxStrstr()
 
-#include "testdate.h"
-
 // to test Today() meaningfully we must be able to change the system date which
 // is not usually the case, but if we're under Win32 we can try it -- define
 // the macro below to do it

tests/testdate.h

@@ -11,6 +11,8 @@
 
 #include "wx/datetime.h"
 
+#include <ostream>
+
 // need this to be able to use CPPUNIT_ASSERT_EQUAL with wxDateTime objects
 inline std::ostream& operator<<(std::ostream& ostr, const wxDateTime& dt)
 {

tests/testprec.h

@@ -4,6 +4,10 @@
 #include "wx/wxprec.h"
 #include "wx/stopwatch.h"
 #include "wx/evtloop.h"
+
+// This needs to be included before catch.hpp to be taken into account.
+#include "testdate.h"
+
 #include "wx/catch_cppunit.h"
 
 // Custom test macro that is only defined when wxUIActionSimulator is available