From 8b0292cccf768efdd5295fe0b662488cbc671079 Mon Sep 17 00:00:00 2001
From: crecher <crecher@crecher.net>
Date: Mon, 12 Oct 2026 04:07:09 +0200
Subject: added cart package, more tests, tests are now at ./tests and added
 .gitignore

---
 cpu/nestest_test.go | 139 ----------------------------------------------------
 1 file changed, 139 deletions(-)
 delete mode 100644 cpu/nestest_test.go

(limited to 'cpu/nestest_test.go')

diff --git a/cpu/nestest_test.go b/cpu/nestest_test.go
deleted file mode 100644
index 4786c5b..0000000
--- a/cpu/nestest_test.go
+++ /dev/null
@@ -1,139 +0,0 @@
-package cpu
-
-import (
-	"bufio"
-	"os"
-	"regexp"
-	"strconv"
-	"testing"
-)
-
-type nestestBus struct {
-	ram [0x0800]uint8
-	prg []uint8
-}
-
-func (b *nestestBus) Read(addr uint16) uint8 {
-	switch {
-	case addr < 0x2000:
-		return b.ram[addr%0x0800]
-	case addr >= 0x8000:
-		return b.prg[int(addr-0x8000)%len(b.prg)]
-	default:
-		return 0
-	}
-}
-
-func (b *nestestBus) Write(addr uint16, v uint8) {
-	if addr < 0x2000 {
-		b.ram[addr%0x0800] = v
-	}
-}
-
-func loadNestestPRG(path string) ([]uint8, error) {
-	data, err := os.ReadFile(path)
-	if err != nil {
-		return nil, err
-	}
-	prgBanks := int(data[4])
-	prgSize := prgBanks * 16 * 1024
-	hasTrainer := data[6]&0x04 != 0
-	offset := 16
-	if hasTrainer {
-		offset += 512
-	}
-	return data[offset : offset+prgSize], nil
-}
-
-type cpuState struct {
-	pc             uint16
-	a, x, y, p, sp uint8
-	cyc            uint64
-}
-
-var nestestLogRE = regexp.MustCompile(
-	`^([0-9A-F]{4}).*A:([0-9A-F]{2}) X:([0-9A-F]{2}) Y:([0-9A-F]{2}) P:([0-9A-F]{2}) SP:([0-9A-F]{2}).*CYC:\s*(\d+)`)
-
-func loadNestestLog(path string) ([]cpuState, error) {
-	f, err := os.Open(path)
-	if err != nil {
-		return nil, err
-	}
-	defer f.Close()
-
-	var lines []cpuState
-	scanner := bufio.NewScanner(f)
-	for scanner.Scan() {
-		m := nestestLogRE.FindStringSubmatch(scanner.Text())
-		if m == nil {
-			continue
-		}
-		parseHex8 := func(s string) uint8 {
-			v, _ := strconv.ParseUint(s, 16, 8)
-			return uint8(v)
-		}
-		pc, _ := strconv.ParseUint(m[1], 16, 16)
-		cyc, _ := strconv.ParseUint(m[7], 10, 64)
-		lines = append(lines, cpuState{
-			pc:  uint16(pc),
-			a:   parseHex8(m[2]),
-			x:   parseHex8(m[3]),
-			y:   parseHex8(m[4]),
-			p:   parseHex8(m[5]),
-			sp:  parseHex8(m[6]),
-			cyc: cyc,
-		})
-	}
-	return lines, scanner.Err()
-}
-
-// TestNestest runs nestest.nes and diffs the state against a known good log before each instruction
-func TestNestest(t *testing.T) {
-	const romPath = "testdata/nestest.nes"
-	const logPath = "testdata/nestest.log"
-
-	if _, err := os.Stat(romPath); err != nil {
-		t.Skip("testdata/nestest.nes not present; add it and testdata/nestest.log to run this test")
-	}
-
-	prg, err := loadNestestPRG(romPath)
-	if err != nil {
-		t.Fatalf("loading ROM: %v", err)
-	}
-	want, err := loadNestestLog(logPath)
-	if err != nil {
-		t.Fatalf("loading log: %v", err)
-	}
-	if len(want) == 0 {
-		t.Fatal("no log lines parsed")
-	}
-
-	bus := &nestestBus{prg: prg}
-	c := NewCPU(bus)
-	c.PC = 0xC000
-	c.SP = 0xFD
-	c.Status = 0x24
-	c.Cycles = want[0].cyc
-
-	for i, w := range want {
-		got := cpuState{c.PC, c.A, c.X, c.Y, c.Status, c.SP, c.Cycles}
-		if got != w {
-			t.Fatalf("line %d: got %+v, want %+v", i+1, got, w)
-		}
-
-		stopped := func() (panicked bool) {
-			defer func() {
-				if r := recover(); r != nil {
-					t.Logf("stopped at line %d: %v", i+1, r)
-					panicked = true
-				}
-			}()
-			c.Step()
-			return false
-		}()
-		if stopped {
-			t.Logf("matched %d instructions before stopping", i+1)
-			return
-		}
-	}
-}
-- 
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