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diff --git a/src/pal/tests/palsuite/c_runtime/fopen/test4/test4.cpp b/src/pal/tests/palsuite/c_runtime/fopen/test4/test4.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: test4.c
+**
+** Purpose: Tests the PAL implementation of the fopen function.
+** Test to ensure that you can't write to a 'r' mode file.
+** And that you can read from a 'r' mode file.
+**
+** Depends:
+** fprintf
+** fclose
+** fgets
+**
+
+**
+**===================================================================*/
+
+#include <palsuite.h>
+
+int __cdecl main(int argc, char **argv)
+{
+
+ FILE *fp;
+ char buffer[128];
+
+ if (PAL_Initialize(argc, argv))
+ {
+ return FAIL;
+ }
+
+
+ /* Open a file with 'w' mode */
+ if( (fp = fopen( "testfile", "w" )) == NULL )
+ {
+ Fail( "ERROR: The file failed to open with 'w' mode.\n" );
+ }
+
+ /* Write some text to the file */
+ if(fprintf(fp,"%s","some text") <= 0)
+ {
+ Fail("ERROR: Attempted to WRITE to a file opened with 'w' mode "
+ "but fprintf failed. Either fopen or fprintf have problems.");
+ }
+
+ if(fclose(fp))
+ {
+ Fail("ERROR: Attempted to close a file, but fclose failed. "
+ "This test depends upon it.");
+ }
+
+ /* Open a file with 'r' mode */
+ if( (fp = fopen( "testfile", "r" )) == NULL )
+ {
+ Fail( "ERROR: The file failed to open with 'r' mode.\n" );
+ }
+
+ /* Attempt to read from the 'r' only file, should pass */
+ if(fgets(buffer,10,fp) == NULL)
+ {
+ Fail("ERROR: Tried to READ from a file with 'r' mode set. "
+ "This should succeed, but fgets returned NULL. Either fgets "
+ "or fopen is broken.");
+ }
+
+ /* Write some text to the file */
+ if(fprintf(fp,"%s","some text") > 0)
+ {
+ Fail("ERROR: Attempted to WRITE to a file opened with 'r' mode "
+ "but fprintf succeeded It should have failed. "
+ "Either fopen or fprintf have problems.");
+ }
+
+
+ PAL_Terminate();
+ return PASS;
+}
+
+