def test_global_read_write():
y = Instance(TEST_BYTES).globals.y
assert y.value == 7
y.value = 8
assert y.value == 8
def test_global_read_write_constant():
z = Instance(TEST_BYTES).globals.z
assert z.value == 42
with pytest.raises(RuntimeError) as context_manager:
z.value = 153
exception = context_manager.value
assert str(exception) == (
'The global variable `z` is not mutable, cannot set a new value.')
