esphome/tests/unit_tests/strategies.py

import hypothesis.strategies._internal.core as st
from hypothesis.strategies._internal.strategies import SearchStrategy


@st.defines_strategy(force_reusable_values=True)
def mac_addr_strings() -> SearchStrategy[str]:
    """A strategy for MAC address strings.

    This consists of six strings representing integers [0..255],
    without zero-padding, joined by dots.
    """
    return st.builds(
        "{:02X}:{:02X}:{:02X}:{:02X}:{:02X}:{:02X}".format, *(6 * [st.integers(0, 255)])
    )