Model/model_data/tests/test_mainheat_attributes.py

import pytest
from model_data.epc_attributes.MainheatAttributes import MainHeatAttributes
from model_data.tests.test_data.test_mainheat_attributes_cases import mainheat_cases


class TestMainHeatAttributes:

    def test_init(self):
        # Test initialization with a valid description
        valid_description = 'Room heaters, electric, Room heaters, mains gas'
        floor_attr = MainHeatAttributes(valid_description)
        assert floor_attr.description == valid_description.lower()

        # Test initialization with an empty description
        with pytest.raises(ValueError):
            MainHeatAttributes('')

        # Test initialization with a description that contains none of the keywords
        with pytest.raises(ValueError):
            MainHeatAttributes('description without keywords')

    @pytest.mark.parametrize(
        "test_case",
        mainheat_cases
    )
    def test_process_mainheat(self, test_case):
        expected_result = test_case.copy()
        del expected_result["original_description"]
        result = MainHeatAttributes(test_case['original_description']).process()
        assert sorted(result.items()) == sorted(expected_result.items())

    def test_invalid_description(self):
        # Test that invalid descriptions raise a ValueError
        invalid_descriptions = [
            "",
            "invalid description",
            "description with no known heating types",
        ]

        for description in invalid_descriptions:
            with pytest.raises(ValueError):
                MainHeatAttributes(description).process()