def test_handles_none_as_constant(self):
handler = ConstantResultHandler(None)
assert handler.read("still not used") is None
output = handler.write("also not used")
assert output == "None"
def test_write_doesnt_overwrite_value(self):
handler = ConstantResultHandler("untouchable!")
handler.write("a different value")
assert handler.value == "untouchable!"
assert handler.read("still unused") == "untouchable!"
def test_write_returns_value(self):
handler = ConstantResultHandler("constant value")
output = handler.write("a different value")
assert output == "'constant value'"