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diff --git a/src/pal/tests/palsuite/c_runtime/isupper/test1/test1.cpp b/src/pal/tests/palsuite/c_runtime/isupper/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
+**
+** Purpose: Tests the PAL implementation of the isupper function
+** Check that a number of characters return the correct
+** values for whether they are upper case or not.
+**
+**
+**===================================================================*/
+
+#include <palsuite.h>
+
+struct testCase
+{
+ int CorrectResult;
+ int character;
+};
+
+int __cdecl main(int argc, char **argv)
+{
+
+ int result;
+ int i;
+
+ /* Note: 1 iff char = A..Z
+ 0 iff char =~ A..Z
+ */
+
+ struct testCase testCases[] =
+ {
+ {1, 'A'}, /* Basic cases */
+ {1, 'Z'},
+ {0, 'b'}, /* Lower case */
+ {0, '?'}, /* Characters without case */
+ {0, 230},
+ {0, '5'}
+ };
+
+ if (PAL_Initialize(argc, argv))
+ {
+ return FAIL;
+ }
+
+
+ /* Loop through each case. Check to see if each is upper case or
+ not.
+ */
+
+ for(i = 0; i < sizeof(testCases) / sizeof(struct testCase); i++)
+ {
+ result = isupper(testCases[i].character);
+
+ /* The return value is 'non-zero' for success. This if condition
+ * will still work if that non-zero isn't just 1
+ */
+ if ( ((testCases[i].CorrectResult == 1) && (result == 0)) ||
+ ( (testCases[i].CorrectResult == 0) && (result != 0) ))
+ {
+ Fail("ERROR: isupper returned %i instead of %i for "
+ "character %c.\n",
+ result,testCases[i].CorrectResult,
+ testCases[i].character);
+ }
+
+ }
+
+
+ PAL_Terminate();
+ return PASS;
+}
+
+
+
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+