+ TESTCASE( fopen( NULL, NULL ) == NULL );
+ TESTCASE( fopen( NULL, "w" ) == NULL );
+ TESTCASE( fopen( "", NULL ) == NULL );
+ TESTCASE( fopen( "", "w" ) == NULL );
+ TESTCASE( fopen( "foo", "" ) == NULL );
+ TESTCASE( fopen( "testfile", "wq" ) == NULL ); /* Illegal mode */
+ TESTCASE( fopen( "testfile", "wr" ) == NULL ); /* Illegal mode */
+ TESTCASE( fopen( "testfile", "w" ) != NULL );
+ system( "rm testfile" );