def test_stack_to_string():
stk = Stack()
assert str(stk) == "[ ]"
stk.push(2)
assert str(stk) == "[2]"
stk.push(3)
assert str(stk) == "[3, 2]"
def test_stack_push_pop():
stk = Stack()
stk.push(2)
stk.push(3)
assert stk.peek() == 3
assert stk.pop() == 3
assert stk.peek() == 2
assert stk.pop() == 2
def test_executor_g():
lines = [['>', 'v'], ['<', '^']]
fld = Field(2, 2, lines)
stk = Stack()
crt = Caret(stk, fld)
stk.push(1)
stk.push(0)
exec_g(crt)
assert stk.peek() == ord('v')
def test_stack_swap():
stk = Stack()
stk.push(2)
stk.push(3)
stk.swap()
assert stk.peek() == 2
assert stk.pop() == 2
assert stk.peek() == 3
assert stk.pop() == 3
def test_executor_p():
lines = [['>', 'v'], ['<', '^']]
fld = Field(2, 2, lines)
stk = Stack()
crt = Caret(stk, fld)
stk.push(ord('@'))
stk.push(1)
stk.push(0)
exec_p(crt)
assert fld.get_symbol_at(1, 0) == '@'
def test_vertical_if():
lines = [['|']]
fld = Field(1, 1, lines)
stk = Stack()
crt = Caret(stk, fld)
stk.push(174)
crt.read_instruction(fld)
crt.execute_instruction()
assert crt.direction == Up
stk.push(0)
crt.read_instruction(fld)
crt.execute_instruction()
assert crt.direction == Down
def test_horizontal_if():
lines = [['_']]
fld = Field(1, 1, lines)
stk = Stack()
crt = Caret(stk, fld)
stk.push(174)
crt.read_instruction(fld)
crt.execute_instruction()
assert crt.direction == Left
stk.push(0)
crt.read_instruction(fld)
crt.execute_instruction()
assert crt.direction == Right