# -*- coding: utf-8 -*-
"""
    jinja2.testsuite.filters
    ~~~~~~~~~~~~~~~~~~~~~~~~

    Tests for the jinja filters.

    :copyright: (c) 2017 by the Jinja Team.
    :license: BSD, see LICENSE for more details.
"""
import random
import pytest
from jinja2 import Markup, Environment
from jinja2._compat import text_type, implements_to_string


@implements_to_string
class Magic(object):
    def __init__(self, value):
        self.value = value

    def __str__(self):
        return text_type(self.value)


@pytest.mark.filter
class TestFilter(object):

    def test_filter_calling(self, env):
        rv = env.call_filter('sum', [1, 2, 3])
        assert rv == 6

    def test_capitalize(self, env):
        tmpl = env.from_string('{{ "foo bar"|capitalize }}')
        assert tmpl.render() == 'Foo bar'

    def test_center(self, env):
        tmpl = env.from_string('{{ "foo"|center(9) }}')
        assert tmpl.render() == '   foo   '

    def test_default(self, env):
        tmpl = env.from_string(
            "{{ missing|default('no') }}|{{ false|default('no') }}|"
            "{{ false|default('no', true) }}|{{ given|default('no') }}"
        )
        assert tmpl.render(given='yes') == 'no|False|no|yes'

    @pytest.mark.parametrize('args,expect', (
        ('', "[('aa', 0), ('AB', 3), ('b', 1), ('c', 2)]"),
        ('true',  "[('AB', 3), ('aa', 0), ('b', 1), ('c', 2)]"),
        ('by="value"',  "[('aa', 0), ('b', 1), ('c', 2), ('AB', 3)]"),
        ('reverse=true', "[('c', 2), ('b', 1), ('AB', 3), ('aa', 0)]")
    ))
    def test_dictsort(self, env, args, expect):
        t = env.from_string('{{{{ foo|dictsort({args}) }}}}'.format(args=args))
        out = t.render(foo={"aa": 0, "b": 1, "c": 2, "AB": 3})
        assert out == expect

    def test_batch(self, env):
        tmpl = env.from_string("{{ foo|batch(3)|list }}|"
                               "{{ foo|batch(3, 'X')|list }}")
        out = tmpl.render(foo=list(range(10)))
        assert out == ("[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9]]|"
                       "[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 'X', 'X']]")

    def test_slice(self, env):
        tmpl = env.from_string('{{ foo|slice(3)|list }}|'
                               '{{ foo|slice(3, "X")|list }}')
        out = tmpl.render(foo=list(range(10)))
        assert out == ("[[0, 1, 2, 3], [4, 5, 6], [7, 8, 9]]|"
                       "[[0, 1, 2, 3], [4, 5, 6, 'X'], [7, 8, 9, 'X']]")

    def test_escape(self, env):
        tmpl = env.from_string('''{{ '<">&'|escape }}''')
        out = tmpl.render()
        assert out == '&lt;&#34;&gt;&amp;'

    def test_striptags(self, env):
        tmpl = env.from_string('''{{ foo|striptags }}''')
        out = tmpl.render(foo='  <p>just a small   \n <a href="#">'
                          'example</a> link</p>\n<p>to a webpage</p> '
                          '<!-- <p>and some commented stuff</p> -->')
        assert out == 'just a small example link to a webpage'

    def test_filesizeformat(self, env):
        tmpl = env.from_string(
            '{{ 100|filesizeformat }}|'
            '{{ 1000|filesizeformat }}|'
            '{{ 1000000|filesizeformat }}|'
            '{{ 1000000000|filesizeformat }}|'
            '{{ 1000000000000|filesizeformat }}|'
            '{{ 100|filesizeformat(true) }}|'
            '{{ 1000|filesizeformat(true) }}|'
            '{{ 1000000|filesizeformat(true) }}|'
            '{{ 1000000000|filesizeformat(true) }}|'
            '{{ 1000000000000|filesizeformat(true) }}'
        )
        out = tmpl.render()
        assert out == (
            '100 Bytes|1.0 kB|1.0 MB|1.0 GB|1.0 TB|100 Bytes|'
            '1000 Bytes|976.6 KiB|953.7 MiB|931.3 GiB'
        )

    def test_filesizeformat_issue59(self, env):
        tmpl = env.from_string(
            '{{ 300|filesizeformat }}|'
            '{{ 3000|filesizeformat }}|'
            '{{ 3000000|filesizeformat }}|'
            '{{ 3000000000|filesizeformat }}|'
            '{{ 3000000000000|filesizeformat }}|'
            '{{ 300|filesizeformat(true) }}|'
            '{{ 3000|filesizeformat(true) }}|'
            '{{ 3000000|filesizeformat(true) }}'
        )
        out = tmpl.render()
        assert out == (
            '300 Bytes|3.0 kB|3.0 MB|3.0 GB|3.0 TB|300 Bytes|'
            '2.9 KiB|2.9 MiB'
        )

    def test_first(self, env):
        tmpl = env.from_string('{{ foo|first }}')
        out = tmpl.render(foo=list(range(10)))
        assert out == '0'

    def test_float(self, env):
        tmpl = env.from_string('{{ "42"|float }}|'
                               '{{ "ajsghasjgd"|float }}|'
                               '{{ "32.32"|float }}')
        out = tmpl.render()
        assert out == '42.0|0.0|32.32'

    def test_format(self, env):
        tmpl = env.from_string('''{{ "%s|%s"|format("a", "b") }}''')
        out = tmpl.render()
        assert out == 'a|b'

    def test_indent(self, env):
        text = '\n'.join(['', 'foo bar', ''])
        t = env.from_string('{{ foo|indent(2, false, false) }}')
        assert t.render(foo=text) == '\n  foo bar\n'
        t = env.from_string('{{ foo|indent(2, false, true) }}')
        assert t.render(foo=text) == '\n  foo bar\n  '
        t = env.from_string('{{ foo|indent(2, true, false) }}')
        assert t.render(foo=text) == '  \n  foo bar\n'
        t = env.from_string('{{ foo|indent(2, true, true) }}')
        assert t.render(foo=text) == '  \n  foo bar\n  '

        t = env.from_string('{{ "jinja"|indent }}')
        assert t.render() == 'jinja'
        t = env.from_string('{{ "jinja"|indent(first=true) }}')
        assert t.render() == '    jinja'
        t = env.from_string('{{ "jinja"|indent(blank=true) }}')
        assert t.render() == 'jinja'

    def test_indentfirst_deprecated(self, env):
        with pytest.warns(DeprecationWarning):
            env.from_string('{{ "jinja"|indent(indentfirst=true) }}').render()

    def test_int(self, env):
        class IntIsh(object):
            def __int__(self):
                return 42

        tmpl = env.from_string('{{ "42"|int }}|{{ "ajsghasjgd"|int }}|'
                               '{{ "32.32"|int }}|{{ "0x4d32"|int(0, 16) }}|'
                               '{{ "011"|int(0, 8)}}|{{ "0x33FU"|int(0, 16) }}|'
                               '{{ obj|int }}')
        out = tmpl.render(obj=IntIsh())
        assert out == '42|0|32|19762|9|0|42'

    def test_join(self, env):
        tmpl = env.from_string('{{ [1, 2, 3]|join("|") }}')
        out = tmpl.render()
        assert out == '1|2|3'

        env2 = Environment(autoescape=True)
        tmpl = env2.from_string(
            '{{ ["<foo>", "<span>foo</span>"|safe]|join }}')
        assert tmpl.render() == '&lt;foo&gt;<span>foo</span>'

    def test_join_attribute(self, env):
        class User(object):
            def __init__(self, username):
                self.username = username
        tmpl = env.from_string('''{{ users|join(', ', 'username') }}''')
        assert tmpl.render(users=map(User, ['foo', 'bar'])) == 'foo, bar'

    def test_last(self, env):
        tmpl = env.from_string('''{{ foo|last }}''')
        out = tmpl.render(foo=list(range(10)))
        assert out == '9'

    def test_length(self, env):
        tmpl = env.from_string('''{{ "hello world"|length }}''')
        out = tmpl.render()
        assert out == '11'

    def test_lower(self, env):
        tmpl = env.from_string('''{{ "FOO"|lower }}''')
        out = tmpl.render()
        assert out == 'foo'

    def test_pprint(self, env):
        from pprint import pformat
        tmpl = env.from_string('''{{ data|pprint }}''')
        data = list(range(1000))
        assert tmpl.render(data=data) == pformat(data)

    def test_random(self, env, request):
        # restore the random state when the test ends
        state = random.getstate()
        request.addfinalizer(lambda: random.setstate(state))
        # generate the random values from a known seed
        random.seed('jinja')
        expected = [random.choice('1234567890') for _ in range(10)]

        # check that the random sequence is generated again by a template
        # ensures that filter result is not constant folded
        random.seed('jinja')
        t = env.from_string('{{ "1234567890"|random }}')

        for value in expected:
            assert t.render() == value

    def test_reverse(self, env):
        tmpl = env.from_string('{{ "foobar"|reverse|join }}|'
                               '{{ [1, 2, 3]|reverse|list }}')
        assert tmpl.render() == 'raboof|[3, 2, 1]'

    def test_string(self, env):
        x = [1, 2, 3, 4, 5]
        tmpl = env.from_string('''{{ obj|string }}''')
        assert tmpl.render(obj=x) == text_type(x)

    def test_title(self, env):
        tmpl = env.from_string('''{{ "foo bar"|title }}''')
        assert tmpl.render() == "Foo Bar"
        tmpl = env.from_string('''{{ "foo's bar"|title }}''')
        assert tmpl.render() == "Foo's Bar"
        tmpl = env.from_string('''{{ "foo   bar"|title }}''')
        assert tmpl.render() == "Foo   Bar"
        tmpl = env.from_string('''{{ "f bar f"|title }}''')
        assert tmpl.render() == "F Bar F"
        tmpl = env.from_string('''{{ "foo-bar"|title }}''')
        assert tmpl.render() == "Foo-Bar"
        tmpl = env.from_string('''{{ "foo\tbar"|title }}''')
        assert tmpl.render() == "Foo\tBar"
        tmpl = env.from_string('''{{ "FOO\tBAR"|title }}''')
        assert tmpl.render() == "Foo\tBar"
        tmpl = env.from_string('''{{ "foo (bar)"|title }}''')
        assert tmpl.render() == "Foo (Bar)"
        tmpl = env.from_string('''{{ "foo {bar}"|title }}''')
        assert tmpl.render() == "Foo {Bar}"
        tmpl = env.from_string('''{{ "foo [bar]"|title }}''')
        assert tmpl.render() == "Foo [Bar]"
        tmpl = env.from_string('''{{ "foo <bar>"|title }}''')
        assert tmpl.render() == "Foo <Bar>"

        class Foo:
            def __str__(self):
                return 'foo-bar'

        tmpl = env.from_string('''{{ data|title }}''')
        out = tmpl.render(data=Foo())
        assert out == 'Foo-Bar'

    def test_truncate(self, env):
        tmpl = env.from_string(
            '{{ data|truncate(15, true, ">>>") }}|'
            '{{ data|truncate(15, false, ">>>") }}|'
            '{{ smalldata|truncate(15) }}'
        )
        out = tmpl.render(data='foobar baz bar' * 1000,
                          smalldata='foobar baz bar')
        msg = 'Current output: %s' % out
        assert out == 'foobar baz b>>>|foobar baz>>>|foobar baz bar', msg

    def test_truncate_very_short(self, env):
        tmpl = env.from_string(
            '{{ "foo bar baz"|truncate(9) }}|'
            '{{ "foo bar baz"|truncate(9, true) }}'
        )
        out = tmpl.render()
        assert out == 'foo bar baz|foo bar baz', out

    def test_truncate_end_length(self, env):
        tmpl = env.from_string('{{ "Joel is a slug"|truncate(7, true) }}')
        out = tmpl.render()
        assert out == 'Joel...', 'Current output: %s' % out

    def test_upper(self, env):
        tmpl = env.from_string('{{ "foo"|upper }}')
        assert tmpl.render() == 'FOO'

    def test_urlize(self, env):
        tmpl = env.from_string(
            '{{ "foo http://www.example.com/ bar"|urlize }}')
        assert tmpl.render() == (
            'foo <a href="http://www.example.com/" rel="noopener">'
            'http://www.example.com/</a> bar'
        )

    def test_urlize_rel_policy(self):
        env = Environment()
        env.policies['urlize.rel'] = None
        tmpl = env.from_string(
            '{{ "foo http://www.example.com/ bar"|urlize }}')
        assert tmpl.render() == (
            'foo <a href="http://www.example.com/">'
            'http://www.example.com/</a> bar'
        )

    def test_urlize_target_parameter(self, env):
        tmpl = env.from_string(
            '{{ "foo http://www.example.com/ bar"|urlize(target="_blank") }}'
        )
        assert tmpl.render() \
            == 'foo <a href="http://www.example.com/" rel="noopener" target="_blank">'\
            'http://www.example.com/</a> bar'

    def test_wordcount(self, env):
        tmpl = env.from_string('{{ "foo bar baz"|wordcount }}')
        assert tmpl.render() == '3'

    def test_block(self, env):
        tmpl = env.from_string(
            '{% filter lower|escape %}<HEHE>{% endfilter %}'
        )
        assert tmpl.render() == '&lt;hehe&gt;'

    def test_chaining(self, env):
        tmpl = env.from_string(
            '''{{ ['<foo>', '<bar>']|first|upper|escape }}'''
        )
        assert tmpl.render() == '&lt;FOO&gt;'

    def test_sum(self, env):
        tmpl = env.from_string('''{{ [1, 2, 3, 4, 5, 6]|sum }}''')
        assert tmpl.render() == '21'

    def test_sum_attributes(self, env):
        tmpl = env.from_string('''{{ values|sum('value') }}''')
        assert tmpl.render(values=[
            {'value': 23},
            {'value': 1},
            {'value': 18},
        ]) == '42'

    def test_sum_attributes_nested(self, env):
        tmpl = env.from_string('''{{ values|sum('real.value') }}''')
        assert tmpl.render(values=[
            {'real': {'value': 23}},
            {'real': {'value': 1}},
            {'real': {'value': 18}},
        ]) == '42'

    def test_sum_attributes_tuple(self, env):
        tmpl = env.from_string('''{{ values.items()|sum('1') }}''')
        assert tmpl.render(values={
            'foo': 23,
            'bar': 1,
            'baz': 18,
        }) == '42'

    def test_abs(self, env):
        tmpl = env.from_string('''{{ -1|abs }}|{{ 1|abs }}''')
        assert tmpl.render() == '1|1', tmpl.render()

    def test_round_positive(self, env):
        tmpl = env.from_string('{{ 2.7|round }}|{{ 2.1|round }}|'
                               "{{ 2.1234|round(3, 'floor') }}|"
                               "{{ 2.1|round(0, 'ceil') }}")
        assert tmpl.render() == '3.0|2.0|2.123|3.0', tmpl.render()

    def test_round_negative(self, env):
        tmpl = env.from_string('{{ 21.3|round(-1)}}|'
                               "{{ 21.3|round(-1, 'ceil')}}|"
                               "{{ 21.3|round(-1, 'floor')}}")
        assert tmpl.render() == '20.0|30.0|20.0', tmpl.render()

    def test_xmlattr(self, env):
        tmpl = env.from_string(
            "{{ {'foo': 42, 'bar': 23, 'fish': none, "
            "'spam': missing, 'blub:blub': '<?>'}|xmlattr }}")
        out = tmpl.render().split()
        assert len(out) == 3
        assert 'foo="42"' in out
        assert 'bar="23"' in out
        assert 'blub:blub="&lt;?&gt;"' in out

    def test_sort1(self, env):
        tmpl = env.from_string(
            '{{ [2, 3, 1]|sort }}|{{ [2, 3, 1]|sort(true) }}')
        assert tmpl.render() == '[1, 2, 3]|[3, 2, 1]'

    def test_sort2(self, env):
        tmpl = env.from_string('{{ "".join(["c", "A", "b", "D"]|sort) }}')
        assert tmpl.render() == 'AbcD'

    def test_sort3(self, env):
        tmpl = env.from_string('''{{ ['foo', 'Bar', 'blah']|sort }}''')
        assert tmpl.render() == "['Bar', 'blah', 'foo']"

    def test_sort4(self, env):
        tmpl = env.from_string('''{{ items|sort(attribute='value')|join }}''')
        assert tmpl.render(items=map(Magic, [3, 2, 4, 1])) == '1234'

    def test_unique(self, env):
        t = env.from_string('{{ "".join(["b", "A", "a", "b"]|unique) }}')
        assert t.render() == "bA"

    def test_unique_case_sensitive(self, env):
        t = env.from_string('{{ "".join(["b", "A", "a", "b"]|unique(true)) }}')
        assert t.render() == "bAa"

    def test_unique_attribute(self, env):
        t = env.from_string("{{ items|unique(attribute='value')|join }}")
        assert t.render(items=map(Magic, [3, 2, 4, 1, 2])) == '3241'

    @pytest.mark.parametrize('source,expect', (
        ('{{ ["a", "B"]|min }}', 'a'),
        ('{{ ["a", "B"]|min(case_sensitive=true) }}', 'B'),
        ('{{ []|min }}', ''),
        ('{{ ["a", "B"]|max }}', 'B'),
        ('{{ ["a", "B"]|max(case_sensitive=true) }}', 'a'),
        ('{{ []|max }}', ''),
    ))
    def test_min_max(self, env, source, expect):
        t = env.from_string(source)
        assert t.render() == expect

    @pytest.mark.parametrize('name,expect', (
        ('min', '1'),
        ('max', '9'),
    ))
    def test_min_max_attribute(self, env, name, expect):
        t = env.from_string('{{ items|' + name + '(attribute="value") }}')
        assert t.render(items=map(Magic, [5, 1, 9])) == expect

    def test_groupby(self, env):
        tmpl = env.from_string('''
        {%- for grouper, list in [{'foo': 1, 'bar': 2},
                                  {'foo': 2, 'bar': 3},
                                  {'foo': 1, 'bar': 1},
                                  {'foo': 3, 'bar': 4}]|groupby('foo') -%}
            {{ grouper }}{% for x in list %}: {{ x.foo }}, {{ x.bar }}{% endfor %}|
        {%- endfor %}''')
        assert tmpl.render().split('|') == [
            "1: 1, 2: 1, 1",
            "2: 2, 3",
            "3: 3, 4",
            ""
        ]

    def test_groupby_tuple_index(self, env):
        tmpl = env.from_string('''
        {%- for grouper, list in [('a', 1), ('a', 2), ('b', 1)]|groupby(0) -%}
            {{ grouper }}{% for x in list %}:{{ x.1 }}{% endfor %}|
        {%- endfor %}''')
        assert tmpl.render() == 'a:1:2|b:1|'

    def test_groupby_multidot(self, env):
        class Date(object):
            def __init__(self, day, month, year):
                self.day = day
                self.month = month
                self.year = year

        class Article(object):
            def __init__(self, title, *date):
                self.date = Date(*date)
                self.title = title
        articles = [
            Article('aha', 1, 1, 1970),
            Article('interesting', 2, 1, 1970),
            Article('really?', 3, 1, 1970),
            Article('totally not', 1, 1, 1971)
        ]
        tmpl = env.from_string('''
        {%- for year, list in articles|groupby('date.year') -%}
            {{ year }}{% for x in list %}[{{ x.title }}]{% endfor %}|
        {%- endfor %}''')
        assert tmpl.render(articles=articles).split('|') == [
            '1970[aha][interesting][really?]',
            '1971[totally not]',
            ''
        ]

    def test_filtertag(self, env):
        tmpl = env.from_string("{% filter upper|replace('FOO', 'foo') %}"
                               "foobar{% endfilter %}")
        assert tmpl.render() == 'fooBAR'

    def test_replace(self, env):
        env = Environment()
        tmpl = env.from_string('{{ string|replace("o", 42) }}')
        assert tmpl.render(string='<foo>') == '<f4242>'
        env = Environment(autoescape=True)
        tmpl = env.from_string('{{ string|replace("o", 42) }}')
        assert tmpl.render(string='<foo>') == '&lt;f4242&gt;'
        tmpl = env.from_string('{{ string|replace("<", 42) }}')
        assert tmpl.render(string='<foo>') == '42foo&gt;'
        tmpl = env.from_string('{{ string|replace("o", ">x<") }}')
        assert tmpl.render(string=Markup('foo')) == 'f&gt;x&lt;&gt;x&lt;'

    def test_forceescape(self, env):
        tmpl = env.from_string('{{ x|forceescape }}')
        assert tmpl.render(x=Markup('<div />')) == u'&lt;div /&gt;'

    def test_safe(self, env):
        env = Environment(autoescape=True)
        tmpl = env.from_string('{{ "<div>foo</div>"|safe }}')
        assert tmpl.render() == '<div>foo</div>'
        tmpl = env.from_string('{{ "<div>foo</div>" }}')
        assert tmpl.render() == '&lt;div&gt;foo&lt;/div&gt;'

    def test_urlencode(self, env):
        env = Environment(autoescape=True)
        tmpl = env.from_string('{{ "Hello, world!"|urlencode }}')
        assert tmpl.render() == 'Hello%2C%20world%21'
        tmpl = env.from_string('{{ o|urlencode }}')
        assert tmpl.render(o=u"Hello, world\u203d") \
            == "Hello%2C%20world%E2%80%BD"
        assert tmpl.render(o=(("f", 1),)) == "f=1"
        assert tmpl.render(o=(('f', 1), ("z", 2))) == "f=1&amp;z=2"
        assert tmpl.render(o=((u"\u203d", 1),)) == "%E2%80%BD=1"
        assert tmpl.render(o={u"\u203d": 1}) == "%E2%80%BD=1"
        assert tmpl.render(o={0: 1}) == "0=1"

    def test_simple_map(self, env):
        env = Environment()
        tmpl = env.from_string('{{ ["1", "2", "3"]|map("int")|sum }}')
        assert tmpl.render() == '6'

    def test_attribute_map(self, env):
        class User(object):
            def __init__(self, name):
                self.name = name
        env = Environment()
        users = [
            User('john'),
            User('jane'),
            User('mike'),
        ]
        tmpl = env.from_string('{{ users|map(attribute="name")|join("|") }}')
        assert tmpl.render(users=users) == 'john|jane|mike'

    def test_empty_map(self, env):
        env = Environment()
        tmpl = env.from_string('{{ none|map("upper")|list }}')
        assert tmpl.render() == '[]'

    def test_simple_select(self, env):
        env = Environment()
        tmpl = env.from_string('{{ [1, 2, 3, 4, 5]|select("odd")|join("|") }}')
        assert tmpl.render() == '1|3|5'

    def test_bool_select(self, env):
        env = Environment()
        tmpl = env.from_string(
            '{{ [none, false, 0, 1, 2, 3, 4, 5]|select|join("|") }}'
        )
        assert tmpl.render() == '1|2|3|4|5'

    def test_simple_reject(self, env):
        env = Environment()
        tmpl = env.from_string('{{ [1, 2, 3, 4, 5]|reject("odd")|join("|") }}')
        assert tmpl.render() == '2|4'

    def test_bool_reject(self, env):
        env = Environment()
        tmpl = env.from_string(
            '{{ [none, false, 0, 1, 2, 3, 4, 5]|reject|join("|") }}'
        )
        assert tmpl.render() == 'None|False|0'

    def test_simple_select_attr(self, env):
        class User(object):
            def __init__(self, name, is_active):
                self.name = name
                self.is_active = is_active
        env = Environment()
        users = [
            User('john', True),
            User('jane', True),
            User('mike', False),
        ]
        tmpl = env.from_string(
            '{{ users|selectattr("is_active")|'
            'map(attribute="name")|join("|") }}'
        )
        assert tmpl.render(users=users) == 'john|jane'

    def test_simple_reject_attr(self, env):
        class User(object):
            def __init__(self, name, is_active):
                self.name = name
                self.is_active = is_active
        env = Environment()
        users = [
            User('john', True),
            User('jane', True),
            User('mike', False),
        ]
        tmpl = env.from_string('{{ users|rejectattr("is_active")|'
                               'map(attribute="name")|join("|") }}')
        assert tmpl.render(users=users) == 'mike'

    def test_func_select_attr(self, env):
        class User(object):
            def __init__(self, id, name):
                self.id = id
                self.name = name
        env = Environment()
        users = [
            User(1, 'john'),
            User(2, 'jane'),
            User(3, 'mike'),
        ]
        tmpl = env.from_string('{{ users|selectattr("id", "odd")|'
                               'map(attribute="name")|join("|") }}')
        assert tmpl.render(users=users) == 'john|mike'

    def test_func_reject_attr(self, env):
        class User(object):
            def __init__(self, id, name):
                self.id = id
                self.name = name
        env = Environment()
        users = [
            User(1, 'john'),
            User(2, 'jane'),
            User(3, 'mike'),
        ]
        tmpl = env.from_string('{{ users|rejectattr("id", "odd")|'
                               'map(attribute="name")|join("|") }}')
        assert tmpl.render(users=users) == 'jane'

    def test_json_dump(self):
        env = Environment(autoescape=True)
        t = env.from_string('{{ x|tojson }}')
        assert t.render(x={'foo': 'bar'}) == '{"foo": "bar"}'
        assert t.render(x='"ba&r\'') == r'"\"ba\u0026r\u0027"'
        assert t.render(x='<bar>') == r'"\u003cbar\u003e"'

        def my_dumps(value, **options):
            assert options == {'foo': 'bar'}
            return '42'
        env.policies['json.dumps_function'] = my_dumps
        env.policies['json.dumps_kwargs'] = {'foo': 'bar'}
        assert t.render(x=23) == '42'
