simple regression test for .charmap

test/asm/val/charmap.s

@@ -0,0 +1,43 @@
+    .setcpu "6502"
+
+    .import _exit
+    .export _main
+
+    .charmap $41, 0
+    .charmap $42, 1
+    .charmap $43, 2
+mapped:
+    .byte "ABC"
+
+    .include "ascii_charmap.inc"
+ascii:
+    .byte "ABC"
+
+_main:
+    ldx #$01
+
+    lda mapped+0
+    cmp #0
+    bne error
+    lda mapped+1
+    cmp #1
+    bne error
+    lda mapped+2
+    cmp #2
+    bne error
+
+    lda ascii+0
+    cmp #$41
+    bne error
+    lda ascii+1
+    cmp #$42
+    bne error
+    lda ascii+2
+    cmp #$43
+    bne error
+
+    ldx #$00
+
+error:
+    txa
+    jmp _exit