From dc14b69189ae91ffb6bbbe96c60a9e3cdd41ab96 Mon Sep 17 00:00:00 2001
From: glywk <glywk.contact@gmail.com>
Date: Thu, 27 Jul 2023 23:15:48 +0200
Subject: [PATCH] Add negative is_blank predicate tests

---
 string/test/predicate_test.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/string/test/predicate_test.cpp b/string/test/predicate_test.cpp
index bc16e7b..2e1ebd7 100644
--- a/string/test/predicate_test.cpp
+++ b/string/test/predicate_test.cpp
@@ -141,6 +141,7 @@ void classification_test()
     
 #ifndef BOOST_NO_CXX11
     TEST_CLASS( is_blank(), " \t", "\t \n\r" );
+    TEST_CLASS( !is_blank(), "abc\n\v\f\r", "a x\t" );
 #endif
     
     TEST_CLASS( !is_classified(std::ctype_base::space), "...", "..\n\r\t " );