def test_fetch(self):
"""Fetch is basic operation of transfer data."""
for i in range(5, 9):
self.ram[i] = i
assert self.ram.fetch(i, WORD_SIZE) == i
assert (self.ram.fetch(5, 4 * WORD_SIZE) ==
0x00000005000000060000000700000008)
assert (self.ram.fetch(5, 4 * WORD_SIZE) ==
big_endian_decode([5, 6, 7, 8], WORD_SIZE))
self.ram[5] = 0
assert (self.ram.fetch(5, 4 * WORD_SIZE) ==
big_endian_decode([0, 6, 7, 8], WORD_SIZE))
assert (self.ram.fetch(5, 4 * WORD_SIZE) ==
0x00000000000000060000000700000008)
with raises(KeyError):
self.ram.fetch(5, 4 * WORD_SIZE - 1)
with raises(KeyError):
self.ram.fetch(4, 4 * WORD_SIZE)
self.ram = RandomAccessMemory(WORD_SIZE, 512, endianess="little")
for i in range(5, 9):
self.ram[i] = i
assert self.ram.fetch(i, WORD_SIZE) == i
assert (self.ram.fetch(5, 4 * WORD_SIZE) ==
0x00000008000000070000000600000005)
assert (self.ram.fetch(5, 4 * WORD_SIZE) ==
little_endian_decode([5, 6, 7, 8], WORD_SIZE))
def test_endianess():
"""Simple test."""
assert big_endian_decode([1, 2, 3], 8) == 1 * 2 ** 16 + 2 * 2 ** 8 + 3
assert little_endian_decode([1, 2, 3], 8) == 3 * 2 ** 16 + 2 * 2 ** 8 + 1
assert big_endian_encode(1 * 2 ** 16 + 2 * 2 ** 8 + 3, 8, 24) == [1, 2, 3]
assert little_endian_encode(3 * 2 ** 16 + 2 * 2 ** 8 + 1, 8, 24) == [1, 2, 3]
assert big_endian_encode(0, 8, 24) == [0, 0, 0]
assert little_endian_encode(0, 8, 24) == [0, 0, 0]
def test_put(self):
"""Test put operation."""
value_list = [0, 6, 7, 0]
value = big_endian_decode(value_list, WORD_SIZE)
self.ram.put(5, value, 4 * WORD_SIZE)
with raises(ValueError):
self.ram.put(5, 2 ** WORD_SIZE, WORD_SIZE)
self.ram.put(4, 4, WORD_SIZE)
for i in range(5, 9):
assert self.ram[i] == value_list[i - 5]
self.ram = RandomAccessMemory(WORD_SIZE, 512, endianess="little")
value = little_endian_decode(value_list, WORD_SIZE)
self.ram.put(5, value, 4 * WORD_SIZE)
for i in range(5, 9):
assert self.ram[i] == value_list[i - 5]
