74 lines
2.2 KiB
C#
74 lines
2.2 KiB
C#
using Xunit;
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namespace GameBoy.Tests
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{
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public sealed class BatteryRamTests
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{
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private static byte PatternByte(int bank, int offset)
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{
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return (byte)((bank * 31 + (offset & 0xFF)) ^ 0x5A);
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}
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private static void FillRam(Emulator emulator, int banks)
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{
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emulator.WriteMemory(0x0000, 0x0A);
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for (int bank = 0; bank < banks; bank++)
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{
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emulator.WriteMemory(0x4000, (byte)bank);
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for (int offset = 0; offset < 0x2000; offset++)
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emulator.WriteMemory((ushort)(0xA000 + offset), PatternByte(bank, offset));
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}
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}
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private static void AssertRamMatches(Emulator emulator, int banks)
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{
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emulator.WriteMemory(0x0000, 0x0A);
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for (int bank = 0; bank < banks; bank++)
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{
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emulator.WriteMemory(0x4000, (byte)bank);
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for (int offset = 0; offset < 0x2000; offset++)
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Assert.Equal(PatternByte(bank, offset), emulator.ReadMemory((ushort)(0xA000 + offset)));
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}
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}
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private static void RoundTrip(byte cartridgeType, byte ramSizeCode, int banks)
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{
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var source = new Emulator(TestRoms.BuildCartridge(cartridgeType, ramSizeCode));
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Assert.True(source.HasBattery);
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FillRam(source, banks);
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byte[] saved = source.SaveRam();
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Assert.Equal(banks * 0x2000, saved.Length);
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var loaded = new Emulator(TestRoms.BuildCartridge(cartridgeType, ramSizeCode));
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loaded.LoadRam(saved);
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AssertRamMatches(loaded, banks);
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}
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[Fact]
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public void Mbc1RamRoundTrips()
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{
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RoundTrip(0x03, 0x02, 1);
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}
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[Fact]
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public void Mbc3RamRoundTrips()
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{
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RoundTrip(0x13, 0x03, 4);
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}
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[Fact]
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public void Mbc5RamRoundTrips()
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{
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RoundTrip(0x1B, 0x03, 4);
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}
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[Fact]
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public void PlainRomReportsNoBattery()
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{
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var emulator = new Emulator(TestRoms.BuildProgram());
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Assert.False(emulator.HasBattery);
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}
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}
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}
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