mirror of https://github.com/ariejan/i6502.git
67 lines
1.4 KiB
Go
67 lines
1.4 KiB
Go
package i6502
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import (
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"testing"
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"github.com/stretchr/testify/assert"
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)
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func TestEmptyAddressBus(t *testing.T) {
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assert := assert.New(t)
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bus, err := NewAddressBus()
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assert.Nil(err)
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if assert.NotNil(bus) {
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assert.EqualValues(0, len(bus.addressables))
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}
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}
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func TestAttachToAddressBus(t *testing.T) {
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assert := assert.New(t)
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bus, _ := NewAddressBus()
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ram, _ := NewRam(0x10000)
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bus.Attach(ram, 0x0000)
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assert.EqualValues(1, len(bus.addressables))
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}
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func TestBusReadWrite(t *testing.T) {
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assert := assert.New(t)
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bus, _ := NewAddressBus()
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ram, _ := NewRam(0x8000)
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ram2, _ := NewRam(0x8000)
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bus.Attach(ram, 0x0000)
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bus.Attach(ram2, 0x8000)
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// 8-bit Writing
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bus.WriteByte(0x1234, 0xFA)
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assert.EqualValues(0xFA, ram.ReadByte(0x1234))
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// 16-bit Writing
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bus.Write16(0x1000, 0xAB42)
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assert.EqualValues(0x42, ram.ReadByte(0x1000))
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assert.EqualValues(0xAB, ram.ReadByte(0x1001))
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// 8-bit Reading
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ram.WriteByte(0x5522, 0xDA)
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assert.EqualValues(0xDA, bus.ReadByte(0x5522))
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// 16-bit Reading
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ram.WriteByte(0x4440, 0x7F)
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ram.WriteByte(0x4441, 0x56)
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assert.EqualValues(0x567F, bus.Read16(0x4440))
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//// Test addressing memory not mounted at 0x0000
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// Read from relative addressable Ram2: $C123
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ram2.WriteByte(0x4123, 0xEF)
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assert.EqualValues(0xEF, bus.ReadByte(0xC123))
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bus.WriteByte(0x8001, 0x12)
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assert.EqualValues(0x12, ram2.ReadByte(0x0001))
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}
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