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from __future__ import annotations

from datetime import datetime
from unittest.mock import Mock

import pytest

from airflow.exceptions import AirflowException
from airflow.ti_deps.deps.valid_state_dep import ValidStateDep
from airflow.utils.state import State


class TestValidStateDep:
    def test_valid_state(self):
        """
        Valid state should pass this dep
        """
        ti = Mock(state=State.QUEUED, end_date=datetime(2016, 1, 1))
        assert ValidStateDep({State.QUEUED}).is_met(ti=ti)

    def test_invalid_state(self):
        """
        Invalid state should fail this dep
        """
        ti = Mock(state=State.SUCCESS, end_date=datetime(2016, 1, 1))
        assert not ValidStateDep({State.FAILED}).is_met(ti=ti)

    def test_no_valid_states(self):
        """
        If there are no valid states the dependency should throw
        """
        ti = Mock(state=State.SUCCESS, end_date=datetime(2016, 1, 1))
        with pytest.raises(AirflowException):
            ValidStateDep({}).is_met(ti=ti)
