def test_cpu_init():
cpu = c64.CPU()
assert cpu.reg.PC == 0
assert cpu.reg.SP == 0x100
assert cpu.ram.size == 0x10000
assert cpu.ram.word_length == 8
assert cpu.ram.get(0) == 0
def test_cpu_init_with_defaults():
cpu = c64.CPU(initial_registers={'PC': 0x1234}, initial_ram=[0xff, 0x02])
assert cpu.reg.PC == 0x1234
assert cpu.reg.SP == 0x100
assert cpu.ram.size == 0x10000
assert cpu.ram.word_length == 8
assert cpu.ram.get(0) == 0xff
assert cpu.ram.get(1) == 0x02
def test_next_word():
cpu = c64.CPU(initial_ram=[0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0xff])
cpu.reg.PC = 0x0002
assert cpu.next_word() == 0x02
assert cpu.next_word() == 0x03
assert cpu.next_word() == 0x04
assert cpu.next_word() == 0x05
assert cpu.next_word() == 0xff
assert cpu.reg.PC == 0x0007
cpu.reg.PC = 0x0000
assert cpu.next_word() == 0x00
assert cpu.next_word() == 0x01
assert cpu.next_word() == 0x02
assert cpu.reg.PC == 0x0003
def test_cpu_init_with_initialized_defaults():
ram = c64.RAM(8, 0xffff, initial_contents=[0xff, 0x01, 0x02, 0x03])
regbank = c64.RegisterBank({
'A': 0xff,
'Y': 0xffff,
'X': 0x12,
'N': 1,
'V': 0,
'PCH': 0xff,
'SP': 0x123
})
cpu = c64.CPU(initial_registers=regbank, initial_ram=ram)
assert cpu.reg.PC == 0xff00
assert cpu.reg.SP == 0x123
assert cpu.ram.size == 0xffff
assert cpu.ram.word_length == 8
assert cpu.ram.get(0) == 0xff
assert cpu.ram.get(1) == 0x01
assert cpu.ram.get(2) == 0x02
assert cpu.ram.get(3) == 0x03
def cpu():
return c64.CPU()