[gcc r16-1495] libstdc++: Test chrono-spec containing only whitespaces.

[Tomasz Kaminski via Libstdc++-cvs]

https://gcc.gnu.org/g:cec7355d9fe2e24ccb1d82913034eebcc6c0e974

commit r16-1495-gcec7355d9fe2e24ccb1d82913034eebcc6c0e974
Author: Tomasz Kamiński <tkami...@redhat.com>
Date:   Thu Jun 12 16:36:15 2025 +0200

    libstdc++: Test chrono-spec containing only whitespaces.
    
    libstdc++-v3/ChangeLog:
    
            * testsuite/std/time/format/whitespace.cc: New test.
    
    Reviewed-by: Jonathan Wakely <jwak...@redhat.com>
    Signed-off-by: Tomasz Kamiński <tkami...@redhat.com>

Diff:
---
 .../testsuite/std/time/format/whitespace.cc        | 56 ++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/libstdc++-v3/testsuite/std/time/format/whitespace.cc 
b/libstdc++-v3/testsuite/std/time/format/whitespace.cc
new file mode 100644
index 000000000000..debda08995cf
--- /dev/null
+++ b/libstdc++-v3/testsuite/std/time/format/whitespace.cc
@@ -0,0 +1,56 @@
+// { dg-do run { target c++20 } }
+
+#include <chrono>
+#include <testsuite_hooks.h>
+
+using namespace std::chrono;
+
+#define WIDEN_(C, S) ::std::__format::_Widen<C>(S, L##S)
+#define WIDEN(S) WIDEN_(_CharT, S)
+
+template<typename _CharT, typename ChronoType>
+void
+test(const ChronoType& ct)
+{
+  std::basic_string<_CharT> res;
+  
+  res = std::format(WIDEN("{:%% %t %n  more text}"), ct);
+  VERIFY( res == WIDEN("% \t \n  more text") );
+
+  res = std::format(WIDEN("{:7%% %t %n}"), ct);
+  VERIFY( res == WIDEN("% \t \n  ") );
+
+  res = std::format(WIDEN("{:>6%% %t %n}"), ct);
+  VERIFY( res == WIDEN(" % \t \n") );
+
+  res = std::format(WIDEN("{:+>7%% %t %n}"), ct);
+  VERIFY( res == WIDEN("++% \t \n") );
+
+  res = std::format(WIDEN("{:=^7%% %t %n}"), ct);
+  VERIFY( res == WIDEN("=% \t \n=") );
+}
+
+template<typename CharT>
+void
+test_all()
+{
+  test<CharT>(20s);
+  test<CharT>(10d);
+  test<CharT>(Monday);
+  test<CharT>(2020y/January/8);
+  test<CharT>(local_days(2020y/January/8));
+  test<CharT>(sys_days(2020y/January/8) + 13h + 10min + 5s);
+#if _GLIBCXX_USE_CXX11_ABI || ! _GLIBCXX_USE_DUAL_ABI
+  test<CharT>(sys_info());
+  test<CharT>(local_info());
+#endif
+}
+
+int main()
+{
+  test_all<char>();
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+  test_all<wchar_t>();
+#endif // _GLIBCXX_USE_WCHAR_T
+}