from django.template.defaultfilters import first
from django.test import SimpleTestCase
from django.utils.safestring import mark_safe

from ..utils import setup


class FirstTests(SimpleTestCase):

    @setup({'first01': '{{ a|first }} {{ b|first }}'})
    def test_first01(self):
        output = self.engine.render_to_string('first01', {"a": ["a&b", "x"], "b": [mark_safe("a&b"), "x"]})
        self.assertEqual(output, "a&b a&b")

    @setup({'first02': '{% autoescape off %}{{ a|first }} {{ b|first }}{% endautoescape %}'})
    def test_first02(self):
        output = self.engine.render_to_string('first02', {"a": ["a&b", "x"], "b": [mark_safe("a&b"), "x"]})
        self.assertEqual(output, "a&b a&b")


class FunctionTests(SimpleTestCase):

    def test_list(self):
        self.assertEqual(first([0, 1, 2]), 0)

    def test_empty_string(self):
        self.assertEqual(first(''), '')

    def test_string(self):
        self.assertEqual(first('test'), 't')