# coding: utf-8
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"""Tests of Enum class with extra class methods"""

from __future__ import absolute_import

__authors__ = ["T. Vincent"]
__license__ = "MIT"
__date__ = "29/04/2019"


import sys
import unittest

import enum
from silx.utils.enum import Enum


class TestEnum(unittest.TestCase):
    """Tests for enum module."""

    def test(self):
        """Test with Enum"""
        class Success(Enum):
            A = 1
            B = 'B'
        self._check_enum_content(Success)

    @unittest.skipIf(sys.version_info.major <= 2, 'Python3 only')
    def test(self):
        """Test Enum with member redefinition"""
        with self.assertRaises(TypeError):
            class Failure(Enum):
                A = 1
                A = 'B'

    def test_unique(self):
        """Test with enum.unique"""
        with self.assertRaises(ValueError):
            @enum.unique
            class Failure(Enum):
                A = 1
                B = 1

        @enum.unique
        class Success(Enum):
            A = 1
            B = 'B'
        self._check_enum_content(Success)

    def _check_enum_content(self, enum_):
        """Check that the content of an enum is: <A: 1, B: 2>.

        :param Enum enum_:
        """
        self.assertEqual(enum_.members(), (enum_.A, enum_.B))
        self.assertEqual(enum_.names(), ('A', 'B'))
        self.assertEqual(enum_.values(), (1, 'B'))

        self.assertEqual(enum_.from_value(1), enum_.A)
        self.assertEqual(enum_.from_value('B'), enum_.B)
        with self.assertRaises(ValueError):
            enum_.from_value(3)
