Jared Miller
72dd047b7b
Implement op_sread (text input), op_save/restore (file I/O stubs), op_restart (exception-based reset), op_input_stream and op_sound_effect (no-op stubs). Add ZCpuRestart exception. All implementations follow TDD with comprehensive unit tests.
664 lines
22 KiB
Python
664 lines
22 KiB
Python
"""
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Unit tests for the Z-machine opcodes and object parser.
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These tests verify the basic behavior of each opcode by mocking the
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required dependencies (memory, stack, decoder, etc).
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"""
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from unittest import TestCase
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from unittest.mock import Mock
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from mudlib.zmachine.zcpu import ZCpu, ZCpuDivideByZero, ZCpuQuit, ZCpuRestart
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class MockMemory:
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"""Mock memory for testing."""
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def __init__(self):
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self.data = bytearray(65536)
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self.version = 3
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self.globals = {}
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def __getitem__(self, addr):
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return self.data[addr]
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def __setitem__(self, addr, value):
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self.data[addr] = value & 0xFF
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def read_word(self, addr):
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return (self.data[addr] << 8) | self.data[addr + 1]
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def write_word(self, addr, value):
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self.data[addr] = (value >> 8) & 0xFF
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self.data[addr + 1] = value & 0xFF
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def read_global(self, varnum):
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return self.globals.get(varnum, 0)
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def write_global(self, varnum, value):
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self.globals[varnum] = value
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class MockStackManager:
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"""Mock stack manager for testing."""
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def __init__(self):
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self.stack = []
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self.locals = [0] * 15
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def push_stack(self, value):
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self.stack.append(value)
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def pop_stack(self):
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return self.stack.pop()
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def get_local_variable(self, index):
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return self.locals[index]
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def set_local_variable(self, index, value):
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self.locals[index] = value
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def finish_routine(self, return_value):
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# Mock implementation - just return a PC value
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return 0x1000
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class MockOpDecoder:
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"""Mock opcode decoder for testing."""
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def __init__(self):
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self.program_counter = 0x800
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self.store_address = None
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self.branch_condition = True
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self.branch_offset = 2
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def get_store_address(self):
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return self.store_address
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def get_branch_offset(self):
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return (self.branch_condition, self.branch_offset)
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class MockUI:
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"""Mock UI for testing."""
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def __init__(self):
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self.screen = Mock()
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self.screen.write = Mock()
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self.keyboard = Mock()
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class ZMachineOpcodeTests(TestCase):
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"""Test suite for Z-machine opcodes."""
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def setUp(self):
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"""Create a minimal CPU for testing."""
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self.memory = MockMemory()
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self.stack = MockStackManager()
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self.decoder = MockOpDecoder()
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self.ui = MockUI()
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# Create CPU with mocked dependencies
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self.cpu = ZCpu(
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self.memory,
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self.decoder,
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self.stack,
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Mock(), # objects
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Mock(), # string
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Mock(), # stream manager
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self.ui,
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)
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def test_op_nop(self):
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"""Test NOP does nothing."""
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# Should just return without error
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self.cpu.op_nop()
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def test_op_new_line(self):
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"""Test new_line prints a newline."""
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self.cpu.op_new_line()
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self.ui.screen.write.assert_called_once_with("\n")
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def test_op_ret_popped(self):
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"""Test ret_popped pops stack and returns."""
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self.stack.push_stack(42)
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self.cpu.op_ret_popped()
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# Should have popped the value and set PC
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self.assertEqual(len(self.stack.stack), 0)
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self.assertEqual(self.cpu._opdecoder.program_counter, 0x1000)
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def test_op_pop(self):
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"""Test pop discards top of stack."""
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self.stack.push_stack(100)
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self.stack.push_stack(200)
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self.cpu.op_pop()
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self.assertEqual(len(self.stack.stack), 1)
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self.assertEqual(self.stack.stack[0], 100)
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def test_op_quit(self):
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"""Test quit raises exception."""
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with self.assertRaises(ZCpuQuit):
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self.cpu.op_quit()
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def test_op_dec(self):
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"""Test decrement variable."""
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# Set local variable 1 to 10
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self.stack.set_local_variable(0, 10)
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# Decrement it (variable 1 = local 0)
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self.cpu.op_dec(1)
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# Should be 9 now
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self.assertEqual(self.stack.get_local_variable(0), 9)
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def test_op_dec_wrapping(self):
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"""Test decrement wraps at zero."""
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# Set local variable 1 to 0
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self.stack.set_local_variable(0, 0)
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# Decrement it
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self.cpu.op_dec(1)
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# Should wrap to 65535
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self.assertEqual(self.stack.get_local_variable(0), 65535)
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def test_op_not(self):
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"""Test bitwise NOT."""
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self.decoder.store_address = 0 # Store to stack
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self.cpu.op_not(0x00FF)
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result = self.stack.pop_stack()
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self.assertEqual(result, 0xFF00)
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def test_op_not_all_ones(self):
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"""Test NOT of all ones gives zero."""
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self.decoder.store_address = 0
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self.cpu.op_not(0xFFFF)
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result = self.stack.pop_stack()
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self.assertEqual(result, 0)
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def test_op_load(self):
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"""Test load reads variable."""
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# Set local variable 2 to 42
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self.stack.set_local_variable(1, 42)
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self.decoder.store_address = 0 # Store to stack
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# Load variable 2
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self.cpu.op_load(2)
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result = self.stack.pop_stack()
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self.assertEqual(result, 42)
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def test_op_mod_positive(self):
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"""Test modulo with positive numbers."""
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self.decoder.store_address = 0
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self.cpu.op_mod(17, 5)
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result = self.stack.pop_stack()
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self.assertEqual(result, 2)
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def test_op_mod_negative_dividend(self):
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"""Test modulo with negative dividend."""
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self.decoder.store_address = 0
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# -17 mod 5 = -2 (z-machine uses C-style truncation toward zero)
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self.cpu.op_mod(self.cpu._unmake_signed(-17), 5)
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result = self.cpu._make_signed(self.stack.pop_stack())
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self.assertEqual(result, -2)
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def test_op_mod_divide_by_zero(self):
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"""Test modulo by zero raises exception."""
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self.decoder.store_address = 0
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with self.assertRaises(ZCpuDivideByZero):
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self.cpu.op_mod(10, 0)
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def test_op_storeb(self):
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"""Test store byte to memory."""
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self.cpu.op_storeb(0x1000, 5, 0x42)
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self.assertEqual(self.memory[0x1005], 0x42)
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def test_op_storeb_truncates(self):
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"""Test store byte truncates to 8 bits."""
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self.cpu.op_storeb(0x2000, 10, 0x1FF)
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self.assertEqual(self.memory[0x200A], 0xFF)
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def test_op_jg_true(self):
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"""Test jump if greater (signed) - true case."""
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self.decoder.branch_condition = True
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self.decoder.branch_offset = 100
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old_pc = self.cpu._opdecoder.program_counter
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self.cpu.op_jg(10, 5)
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# Should have branched (offset - 2)
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self.assertEqual(self.cpu._opdecoder.program_counter, old_pc + 98)
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def test_op_jg_false(self):
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"""Test jump if greater (signed) - false case."""
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self.decoder.branch_condition = True # Branch if true (but test is false)
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self.decoder.branch_offset = 100
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old_pc = self.cpu._opdecoder.program_counter
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self.cpu.op_jg(5, 10)
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# Should not have branched (test is false, condition is true)
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self.assertEqual(self.cpu._opdecoder.program_counter, old_pc)
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def test_op_jg_signed(self):
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"""Test jump if greater handles signed comparison."""
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# -1 (as unsigned 65535) should NOT be greater than 1
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self.decoder.branch_condition = False
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old_pc = self.cpu._opdecoder.program_counter
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self.cpu.op_jg(65535, 1)
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# Should not branch (false condition matches)
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self.assertEqual(self.cpu._opdecoder.program_counter, old_pc)
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def test_op_pull(self):
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"""Test pull from stack to variable."""
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# Push value onto stack
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self.stack.push_stack(123)
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# Pull into local variable 1
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self.cpu.op_pull(1)
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# Should have stored in local variable 0 (variable 1)
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self.assertEqual(self.stack.get_local_variable(0), 123)
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# Stack should be empty
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self.assertEqual(len(self.stack.stack), 0)
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def test_op_print_addr(self):
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"""Test print_addr decodes and prints text at byte address."""
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# Configure mock string decoder to return a known string
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self.cpu._string.get = Mock(return_value="Hello, world!")
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# Print text at address 0x5000
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self.cpu.op_print_addr(0x5000)
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# Should have called string decoder with the address
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self.cpu._string.get.assert_called_once_with(0x5000)
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# Should have written the decoded text
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self.ui.screen.write.assert_called_once_with("Hello, world!")
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def test_op_print_num_positive(self):
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"""Test print_num prints positive number."""
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self.cpu.op_print_num(42)
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self.ui.screen.write.assert_called_once_with("42")
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def test_op_print_num_negative(self):
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"""Test print_num prints negative number."""
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# -1 as unsigned 16-bit is 65535
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self.cpu.op_print_num(65535)
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self.ui.screen.write.assert_called_once_with("-1")
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def test_op_print_num_zero(self):
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"""Test print_num prints zero."""
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self.cpu.op_print_num(0)
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self.ui.screen.write.assert_called_once_with("0")
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def test_op_ret(self):
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"""Test ret returns from routine with value."""
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self.cpu.op_ret(42)
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# Should have set PC to caller's address (0x1000 from mock)
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self.assertEqual(self.cpu._opdecoder.program_counter, 0x1000)
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def test_op_show_status(self):
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"""Test show_status is a no-op (V3 only, not needed in MUD)."""
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# Should just not raise an exception
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self.cpu.op_show_status()
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class MockObjectParser:
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"""Mock object parser for testing CPU opcodes."""
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def __init__(self):
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self.attributes = {}
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self.parents = {}
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self.siblings = {}
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self.children = {}
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self.shortnames = {}
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self.property_data_addresses = {}
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self.next_properties = {}
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def get_attribute(self, objnum, attrnum):
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return self.attributes.get((objnum, attrnum), 0)
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def set_attribute(self, objnum, attrnum):
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self.attributes[(objnum, attrnum)] = 1
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def clear_attribute(self, objnum, attrnum):
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self.attributes[(objnum, attrnum)] = 0
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def get_parent(self, objnum):
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return self.parents.get(objnum, 0)
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def get_sibling(self, objnum):
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return self.siblings.get(objnum, 0)
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def remove_object(self, objnum):
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# Simple implementation - just clear parent
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self.parents[objnum] = 0
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def get_shortname(self, objnum):
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return self.shortnames.get(objnum, "object")
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def get_property_data_address(self, objnum, propnum):
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return self.property_data_addresses.get((objnum, propnum), 0)
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def get_next_property(self, objnum, propnum):
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return self.next_properties.get((objnum, propnum), 0)
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def get_property_length(self, data_address):
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# Simple mock - return 2 for non-zero addresses
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return 2 if data_address != 0 else 0
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class ZMachineObjectOpcodeTests(TestCase):
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"""Test suite for Z-machine object tree opcodes."""
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def setUp(self):
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"""Create a CPU with mocked object parser."""
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self.memory = MockMemory()
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self.stack = MockStackManager()
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self.decoder = MockOpDecoder()
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self.ui = MockUI()
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self.objects = MockObjectParser()
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self.string = Mock()
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self.string.get = Mock(return_value="test object")
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self.cpu = ZCpu(
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self.memory,
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self.decoder,
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self.stack,
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self.objects,
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self.string,
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Mock(), # stream manager
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self.ui,
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)
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def test_op_get_sibling_with_sibling(self):
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"""Test get_sibling stores sibling and branches if nonzero."""
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self.objects.siblings[5] = 7
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self.decoder.store_address = 0
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self.decoder.branch_condition = True
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self.decoder.branch_offset = 10
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old_pc = self.cpu._opdecoder.program_counter
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self.cpu.op_get_sibling(5)
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# Should store 7
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self.assertEqual(self.stack.pop_stack(), 7)
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# Should branch (offset - 2)
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self.assertEqual(self.cpu._opdecoder.program_counter, old_pc + 8)
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def test_op_get_sibling_no_sibling(self):
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"""Test get_sibling with no sibling doesn't branch."""
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self.objects.siblings[5] = 0
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self.decoder.store_address = 0
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self.decoder.branch_condition = True
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old_pc = self.cpu._opdecoder.program_counter
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self.cpu.op_get_sibling(5)
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# Should store 0
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self.assertEqual(self.stack.pop_stack(), 0)
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# Should not branch
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self.assertEqual(self.cpu._opdecoder.program_counter, old_pc)
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def test_op_test_attr_true(self):
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"""Test test_attr branches when attribute is set."""
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self.objects.attributes[(10, 5)] = 1
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self.decoder.branch_condition = True
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self.decoder.branch_offset = 20
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old_pc = self.cpu._opdecoder.program_counter
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self.cpu.op_test_attr(10, 5)
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# Should branch
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self.assertEqual(self.cpu._opdecoder.program_counter, old_pc + 18)
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def test_op_test_attr_false(self):
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"""Test test_attr doesn't branch when attribute is clear."""
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self.objects.attributes[(10, 5)] = 0
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self.decoder.branch_condition = True
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old_pc = self.cpu._opdecoder.program_counter
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self.cpu.op_test_attr(10, 5)
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# Should not branch
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self.assertEqual(self.cpu._opdecoder.program_counter, old_pc)
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def test_op_set_attr(self):
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"""Test set_attr sets attribute on object."""
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self.cpu.op_set_attr(15, 3)
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# Should have called set_attribute
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self.assertEqual(self.objects.attributes.get((15, 3)), 1)
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def test_op_clear_attr(self):
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"""Test clear_attr clears attribute on object."""
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self.objects.attributes[(15, 3)] = 1
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self.cpu.op_clear_attr(15, 3)
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# Should have called clear_attribute
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self.assertEqual(self.objects.attributes.get((15, 3)), 0)
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def test_op_jin_true(self):
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"""Test jin branches when obj1 parent equals obj2."""
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self.objects.parents[5] = 10
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self.decoder.branch_condition = True
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self.decoder.branch_offset = 15
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old_pc = self.cpu._opdecoder.program_counter
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self.cpu.op_jin(5, 10)
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# Should branch
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self.assertEqual(self.cpu._opdecoder.program_counter, old_pc + 13)
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def test_op_jin_false(self):
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"""Test jin doesn't branch when obj1 parent not equal to obj2."""
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self.objects.parents[5] = 8
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self.decoder.branch_condition = True
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old_pc = self.cpu._opdecoder.program_counter
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self.cpu.op_jin(5, 10)
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# Should not branch
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self.assertEqual(self.cpu._opdecoder.program_counter, old_pc)
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def test_op_remove_obj(self):
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"""Test remove_obj removes object from parent."""
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self.objects.parents[7] = 3
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self.cpu.op_remove_obj(7)
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# Parent should be cleared
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self.assertEqual(self.objects.parents.get(7), 0)
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def test_op_print_obj(self):
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"""Test print_obj prints object's short name."""
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self.objects.shortnames[12] = "brass lantern"
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self.cpu.op_print_obj(12)
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self.ui.screen.write.assert_called_once_with("brass lantern")
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def test_op_get_prop_addr_found(self):
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"""Test get_prop_addr stores data address when property exists."""
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self.objects.property_data_addresses[(20, 5)] = 0x5000
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self.decoder.store_address = 0
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self.cpu.op_get_prop_addr(20, 5)
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# Should store the data address
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self.assertEqual(self.stack.pop_stack(), 0x5000)
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def test_op_get_prop_addr_not_found(self):
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"""Test get_prop_addr stores 0 when property doesn't exist."""
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self.decoder.store_address = 0
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self.cpu.op_get_prop_addr(20, 99)
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# Should store 0
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self.assertEqual(self.stack.pop_stack(), 0)
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def test_op_get_next_prop_first(self):
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"""Test get_next_prop with propnum=0 returns first property."""
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self.objects.next_properties[(25, 0)] = 15
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self.decoder.store_address = 0
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self.cpu.op_get_next_prop(25, 0)
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# Should store first property number
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self.assertEqual(self.stack.pop_stack(), 15)
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def test_op_get_next_prop_next(self):
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"""Test get_next_prop with propnum>0 returns next property."""
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self.objects.next_properties[(25, 10)] = 8
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self.decoder.store_address = 0
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self.cpu.op_get_next_prop(25, 10)
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# Should store next property number
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self.assertEqual(self.stack.pop_stack(), 8)
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def test_op_get_prop_len(self):
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"""Test get_prop_len returns property data length."""
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self.decoder.store_address = 0
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self.cpu.op_get_prop_len(0x6000)
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# Should store 2 (from mock)
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|
self.assertEqual(self.stack.pop_stack(), 2)
|
|
|
|
def test_op_get_prop_len_zero_addr(self):
|
|
"""Test get_prop_len with address 0 returns 0."""
|
|
self.decoder.store_address = 0
|
|
|
|
self.cpu.op_get_prop_len(0)
|
|
|
|
# Should store 0
|
|
self.assertEqual(self.stack.pop_stack(), 0)
|
|
|
|
|
|
class ZMachineComplexOpcodeTests(TestCase):
|
|
"""Test suite for complex Z-machine opcodes (input, save/restore, restart)."""
|
|
|
|
def setUp(self):
|
|
"""Create a CPU with all necessary mocks."""
|
|
self.memory = MockMemory()
|
|
self.stack = MockStackManager()
|
|
self.decoder = MockOpDecoder()
|
|
self.ui = MockUI()
|
|
|
|
# Create CPU with mocked dependencies
|
|
self.cpu = ZCpu(
|
|
self.memory,
|
|
self.decoder,
|
|
self.stack,
|
|
Mock(), # objects
|
|
Mock(), # string
|
|
Mock(), # stream manager
|
|
self.ui,
|
|
)
|
|
|
|
def test_op_sread_v3_basic_input(self):
|
|
"""Test sread (V3) reads text into buffer and null-terminates."""
|
|
# Setup: text buffer at 0x1000, max length 20
|
|
text_buffer_addr = 0x1000
|
|
self.memory[text_buffer_addr] = 20 # max length
|
|
|
|
# Mock keyboard input
|
|
self.ui.keyboard.readline = Mock(return_value="hello world\n")
|
|
|
|
# Call sread with text buffer only (no parse buffer)
|
|
self.cpu.op_sread(text_buffer_addr, 0)
|
|
|
|
# Verify text is stored lowercased starting at offset 1
|
|
expected = "hello world"
|
|
for i, ch in enumerate(expected):
|
|
self.assertEqual(self.memory[text_buffer_addr + 1 + i], ord(ch))
|
|
|
|
# Verify null termination
|
|
self.assertEqual(self.memory[text_buffer_addr + 1 + len(expected)], 0)
|
|
|
|
def test_op_sread_v3_truncates_to_max_length(self):
|
|
"""Test sread respects max length in buffer."""
|
|
text_buffer_addr = 0x1000
|
|
self.memory[text_buffer_addr] = 5 # max length of 5
|
|
|
|
self.ui.keyboard.readline = Mock(return_value="hello world\n")
|
|
|
|
self.cpu.op_sread(text_buffer_addr, 0)
|
|
|
|
# Should only store first 5 characters
|
|
expected = "hello"
|
|
for i, ch in enumerate(expected):
|
|
self.assertEqual(self.memory[text_buffer_addr + 1 + i], ord(ch))
|
|
self.assertEqual(self.memory[text_buffer_addr + 1 + 5], 0)
|
|
|
|
def test_op_sread_v3_lowercases_input(self):
|
|
"""Test sread converts input to lowercase."""
|
|
text_buffer_addr = 0x1000
|
|
self.memory[text_buffer_addr] = 20
|
|
|
|
self.ui.keyboard.readline = Mock(return_value="HELLO World\n")
|
|
|
|
self.cpu.op_sread(text_buffer_addr, 0)
|
|
|
|
expected = "hello world"
|
|
for i, ch in enumerate(expected):
|
|
self.assertEqual(self.memory[text_buffer_addr + 1 + i], ord(ch))
|
|
|
|
def test_op_sread_v3_strips_newlines(self):
|
|
"""Test sread strips newlines and carriage returns."""
|
|
text_buffer_addr = 0x1000
|
|
self.memory[text_buffer_addr] = 20
|
|
|
|
self.ui.keyboard.readline = Mock(return_value="test\r\n")
|
|
|
|
self.cpu.op_sread(text_buffer_addr, 0)
|
|
|
|
expected = "test"
|
|
for i, ch in enumerate(expected):
|
|
self.assertEqual(self.memory[text_buffer_addr + 1 + i], ord(ch))
|
|
self.assertEqual(self.memory[text_buffer_addr + 1 + 4], 0)
|
|
|
|
def test_op_sread_v3_calls_show_status(self):
|
|
"""Test sread calls op_show_status for V3."""
|
|
text_buffer_addr = 0x1000
|
|
self.memory[text_buffer_addr] = 20
|
|
self.ui.keyboard.readline = Mock(return_value="test\n")
|
|
|
|
# Track if show_status was called
|
|
call_count = [0]
|
|
original = self.cpu.op_show_status
|
|
|
|
def counted_show_status(*args):
|
|
call_count[0] += 1
|
|
return original(*args)
|
|
|
|
self.cpu.op_show_status = counted_show_status # type: ignore
|
|
|
|
self.cpu.op_sread(text_buffer_addr, 0)
|
|
|
|
# Should have called show_status once
|
|
self.assertEqual(call_count[0], 1)
|
|
|
|
def test_op_save_v3_branches_false(self):
|
|
"""Test save (V3) branches false (QuetzalWriter not functional)."""
|
|
self.decoder.branch_condition = True
|
|
self.decoder.branch_offset = 100
|
|
old_pc = self.cpu._opdecoder.program_counter
|
|
|
|
self.cpu.op_save()
|
|
|
|
# Should not have branched (test is false)
|
|
self.assertEqual(self.cpu._opdecoder.program_counter, old_pc)
|
|
|
|
def test_op_restore_v3_branches_false(self):
|
|
"""Test restore (V3) branches false (no valid save files)."""
|
|
self.decoder.branch_condition = True
|
|
self.decoder.branch_offset = 100
|
|
old_pc = self.cpu._opdecoder.program_counter
|
|
|
|
self.cpu.op_restore()
|
|
|
|
# Should not have branched (test is false)
|
|
self.assertEqual(self.cpu._opdecoder.program_counter, old_pc)
|
|
|
|
def test_op_input_stream_is_noop(self):
|
|
"""Test input_stream is a no-op stub."""
|
|
# Should not raise
|
|
self.cpu.op_input_stream(1)
|
|
|
|
def test_op_sound_effect_is_noop(self):
|
|
"""Test sound_effect is a no-op stub."""
|
|
# Should not raise
|
|
self.cpu.op_sound_effect(1, 2, 3)
|
|
|
|
def test_op_restart_raises_exception(self):
|
|
"""Test restart raises ZCpuRestart exception for run loop to handle."""
|
|
with self.assertRaises(ZCpuRestart):
|
|
self.cpu.op_restart()
|
|
|
|
|
|
# Note: ZObjectParser methods are tested through integration tests
|
|
# with real story files, not unit tests with mock memory, as the
|
|
# interaction with ZStringFactory makes mocking complex.
|