added tests as prepared by oliver

test/ref/charconst.c

@@ -0,0 +1,59 @@
+/*
+  !!DESCRIPTION!! check if character constants are translated correctly
+  !!ORIGIN!!      cc65 bug report
+  !!LICENCE!!     Public Domain
+*/
+
+#include <limits.h>
+#include <ctype.h>
+
+void backslash(unsigned char c)
+{
+    printf("%c : ",c);
+
+    switch (c)
+    {
+	case 'b':
+		c = '\b';
+	case 'f':
+		c = '\f';
+	case 'n':
+		c = '\n';
+	case 'r':
+		c = '\r';
+	case 't':
+		c = '\t';
+	case 'v':
+    #ifndef NO_BACKSLASH_V
+        c = '\v';
+    #else
+        c = 0x0b;
+    #endif
+	}
+
+    if(!isprint(c))
+    {
+        printf("ok.\n");
+    }
+    else
+    {
+        printf("failed.\n");
+    }
+}
+
+void testbackslash(void)
+{
+        backslash('b');
+        backslash('f');
+        backslash('n');
+        backslash('r');
+        backslash('t');
+        backslash('v');
+}
+
+int main(void)
+{
+	testbackslash();
+
+	return 0;
+}