1 files changed, 19 insertions, 0 deletions
diff --git a/libc/test/src/ctype/isprint_test.cpp b/libc/test/src/ctype/isprint_test.cpp
new file mode 100644
index 000000000000..565453e0013c
--- /dev/null
+++ b/libc/test/src/ctype/isprint_test.cpp
@@ -0,0 +1,19 @@
+//===-- Unittests for isprint----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/ctype/isprint.h"
+#include "utils/UnitTest/Test.h"
+
+TEST(IsPrint, DefaultLocale) {
+  for (int ch = 0; ch < 255; ++ch) {
+    if (' ' <= ch && ch <= '~') // A-Z, a-z, 0-9, punctuation, space.
+      EXPECT_NE(__llvm_libc::isprint(ch), 0);
+    else
+      EXPECT_EQ(__llvm_libc::isprint(ch), 0);
+  }
+}