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diff --git a/src/pal/tests/palsuite/c_runtime/towupper/test1/test1.cpp b/src/pal/tests/palsuite/c_runtime/towupper/test1/test1.cpp
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*=====================================================================
+**
+** Source: test1.c(towupper)
+**
+**
+** Purpose: Tests the PAL implementation of the towupper function.
+** Check that the towupper function makes lower case
+** character a capital. Also check that it has no effect
+** on upper case letters and special characters.
+**
+**
+**===================================================================*/
+
+#include <palsuite.h>
+
+struct testCase
+{
+ WCHAR upper;
+ WCHAR start;
+};
+
+int __cdecl main(int argc, char **argv)
+{
+
+ int result;
+ int i;
+
+ struct testCase testCases[] =
+ {
+ {'A', 'a'}, /* Basic cases */
+ {'Z', 'z'},
+ {'B', 'B'}, /* Upper case */
+ {'%', '%'}, /* Characters without case */
+ {157, 157}
+ };
+
+ if ((PAL_Initialize(argc, argv)) != 0)
+ {
+ return FAIL;
+ }
+
+
+ /* Loop through each case. Convert each character to upper case
+ and then compare to ensure that it is the correct value.
+ */
+
+ for(i = 0; i < sizeof(testCases) / sizeof(struct testCase); i++)
+ {
+ /*Convert to upper case*/
+ result = towupper(testCases[i].start);
+
+ if (testCases[i].upper != result)
+ {
+ Fail("ERROR: towupper capitalized \"%c\" to %c instead of %c.\n",
+ testCases[i].start, result, testCases[i].upper);
+ }
+ }
+
+ PAL_Terminate();
+ return PASS;
+}