"""Test List helpers."""
from ddex_ingester_common.helpers.list import (
    have_common_elements
)


def test_have_common_elements_true():
    """Test have_common_elements returns the correct value."""
    first = ['1A', '2B', '3C']
    second = ['3C', '4D', '5E']

    output = have_common_elements(first, second)
    assert output is True


def test_have_common_elements_false():
    """Test have_common_elements returns the correct value."""
    first = ['1A', '2B', '3C']
    second = ['3CC', '4D', '5E']

    output = have_common_elements(first, second)
    assert output is False


def test_have_common_elements_null():
    """Test have_common_elements returns the correct value."""
    first = []
    second = None

    output = have_common_elements(first, second)
    assert output is False