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Add some tests for MMU IO & handlers
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,135 @@ | ||
| package mem | ||
|
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||
| import ( | ||
| "testing" | ||
| ) | ||
|
|
||
| const ( | ||
| handlerReadReplaceValue = 0xAB | ||
| handlerWriteReplaceValue = 0xEA | ||
| ) | ||
|
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| type testReplacementHandler struct{} | ||
|
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| func (h *testReplacementHandler) OnRead(mmu *MMU, addr uint16) MemRead { | ||
| return ReadReplace(handlerReadReplaceValue) | ||
| } | ||
|
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| func (h *testReplacementHandler) OnWrite(mmu *MMU, addr uint16, value byte) MemWrite { | ||
| return WriteReplace(handlerWriteReplaceValue) | ||
| } | ||
|
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| type testPassthroughHandler struct{} | ||
|
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| func (h *testPassthroughHandler) OnRead(mmu *MMU, addr uint16) MemRead { | ||
| return ReadPassthrough() | ||
| } | ||
|
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| func (h *testPassthroughHandler) OnWrite(mmu *MMU, addr uint16, value byte) MemWrite { | ||
| return WritePassthrough() | ||
| } | ||
|
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| type testWriteBlockHandler struct{} | ||
|
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| func (h *testWriteBlockHandler) OnRead(mmu *MMU, addr uint16) MemRead { | ||
| return ReadPassthrough() | ||
| } | ||
|
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| func (h *testWriteBlockHandler) OnWrite(mmu *MMU, addr uint16, value byte) MemWrite { | ||
| return WriteBlock() | ||
| } | ||
|
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| func assertAddrEquals[T uint8 | uint16](t *testing.T, actual T, expected T) { | ||
| if actual != expected { | ||
| t.Errorf("Expected 0x%X, but got 0x%x", expected, actual) | ||
| } | ||
| } | ||
|
|
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| func TestMmuBasicReads(t *testing.T) { | ||
| ram := make([]byte, 0xFFFF) | ||
| mmu := NewMMU(ram) | ||
|
|
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| ram[0x100] = 0xC0 | ||
| ram[0x101] = 0xEE | ||
| ram[0x102] = 0xFF | ||
|
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| assertAddrEquals(t, mmu.Read8(0x100), 0xC0) | ||
| assertAddrEquals(t, mmu.Read16(0x101), 0xFFEE) | ||
| } | ||
|
|
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| func TestMmuBasicWrites(t *testing.T) { | ||
| ram := make([]byte, 0xFFFF) | ||
| mmu := NewMMU(ram) | ||
|
|
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| mmu.Write8(0x100, 0xC0) | ||
| mmu.Write16(0x101, 0xFFEE) | ||
|
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| assertAddrEquals(t, ram[0x100], 0xC0) | ||
| assertAddrEquals(t, ram[0x101], 0xEE) | ||
| assertAddrEquals(t, ram[0x102], 0xFF) | ||
| } | ||
|
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| func TestMmuReadHandlerReplacement(t *testing.T) { | ||
| ram := make([]byte, 0xFFFF) | ||
| mmu := NewMMU(ram) | ||
|
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| mmu.AddHandler(MemRegion{Start: 0x100, End: 0x200}, &testReplacementHandler{}) | ||
|
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| ram[0x103] = 0x11 | ||
| ram[0x201] = 0x22 | ||
|
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| assertAddrEquals(t, mmu.Read8(0x103), handlerReadReplaceValue) | ||
| assertAddrEquals(t, mmu.Read8(0x201), 0x22) | ||
| } | ||
|
|
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| func TestMmuReadHandlerPassthrough(t *testing.T) { | ||
| ram := make([]byte, 0xFFFF) | ||
| mmu := NewMMU(ram) | ||
|
|
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| mmu.AddHandler(MemRegion{Start: 0x100, End: 0x200}, &testPassthroughHandler{}) | ||
|
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| ram[0x103] = 0x11 | ||
| ram[0x201] = 0x22 | ||
|
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| assertAddrEquals(t, mmu.Read8(0x103), 0x11) | ||
| assertAddrEquals(t, mmu.Read8(0x201), 0x22) | ||
| } | ||
|
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| func TestMmuWriteHandlerReplacement(t *testing.T) { | ||
| ram := make([]byte, 0xFFFF) | ||
| mmu := NewMMU(ram) | ||
|
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| mmu.AddHandler(MemRegion{Start: 0x100, End: 0x200}, &testReplacementHandler{}) | ||
|
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| mmu.Write8(0x103, 0x11) | ||
| mmu.Write8(0x201, 0x22) | ||
|
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| assertAddrEquals(t, ram[0x103], handlerWriteReplaceValue) | ||
| assertAddrEquals(t, ram[0x201], 0x22) | ||
| } | ||
|
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| func TestMmuWriteHandlerPassthrough(t *testing.T) { | ||
| ram := make([]byte, 0xFFFF) | ||
| mmu := NewMMU(ram) | ||
|
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| mmu.AddHandler(MemRegion{Start: 0x100, End: 0x200}, &testPassthroughHandler{}) | ||
|
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| mmu.Write8(0x103, 0x11) | ||
| mmu.Write8(0x201, 0x22) | ||
|
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| assertAddrEquals(t, ram[0x103], 0x11) | ||
| assertAddrEquals(t, ram[0x201], 0x22) | ||
| } | ||
|
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| func TestMmuWriteHandlerBlock(t *testing.T) { | ||
| ram := make([]byte, 0xFFFF) | ||
| mmu := NewMMU(ram) | ||
|
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| mmu.AddHandler(MemRegion{Start: 0x100, End: 0x200}, &testWriteBlockHandler{}) | ||
|
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| mmu.Write8(0x103, 0x11) | ||
| mmu.Write8(0x201, 0x22) | ||
|
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| assertAddrEquals(t, ram[0x103], 0x00) | ||
| assertAddrEquals(t, ram[0x201], 0x22) | ||
| } |