from pathlib import Path
import sys


SCRIPTS = Path(__file__).resolve().parents[1] / "scripts"
sys.path.insert(0, str(SCRIPTS))

from water_quality import normalize_parameter, parse_observation_value  # noqa: E402


def test_normalizes_total_phosphorus_name():
    assert normalize_parameter("PHOSPHORUS TOTAL") == "total_phosphorus"


def test_marks_less_than_detection_limit_as_censored():
    parsed = parse_observation_value(value="0.005", flag="<")

    assert parsed.value == 0.005
    assert parsed.is_censored is True