django/tests/template_tests/syntax_tests/test_if.py

from django.template import TemplateSyntaxError
from django.template.defaulttags import IfNode
from django.test import SimpleTestCase

from ..utils import TestObj, setup


class IfTagTests(SimpleTestCase):
    @setup({"if-tag01": "{% if foo %}yes{% else %}no{% endif %}"})
    def test_if_tag01(self):
        output = self.engine.render_to_string("if-tag01", {"foo": True})
        self.assertEqual(output, "yes")

    @setup({"if-tag02": "{% if foo %}yes{% else %}no{% endif %}"})
    def test_if_tag02(self):
        output = self.engine.render_to_string("if-tag02", {"foo": False})
        self.assertEqual(output, "no")

    @setup({"if-tag03": "{% if foo %}yes{% else %}no{% endif %}"})
    def test_if_tag03(self):
        output = self.engine.render_to_string("if-tag03")
        self.assertEqual(output, "no")

    @setup({"if-tag04": "{% if foo %}foo{% elif bar %}bar{% endif %}"})
    def test_if_tag04(self):
        output = self.engine.render_to_string("if-tag04", {"foo": True})
        self.assertEqual(output, "foo")

    @setup({"if-tag05": "{% if foo %}foo{% elif bar %}bar{% endif %}"})
    def test_if_tag05(self):
        output = self.engine.render_to_string("if-tag05", {"bar": True})
        self.assertEqual(output, "bar")

    @setup({"if-tag06": "{% if foo %}foo{% elif bar %}bar{% endif %}"})
    def test_if_tag06(self):
        output = self.engine.render_to_string("if-tag06")
        self.assertEqual(output, "")

    @setup({"if-tag07": "{% if foo %}foo{% elif bar %}bar{% else %}nothing{% endif %}"})
    def test_if_tag07(self):
        output = self.engine.render_to_string("if-tag07", {"foo": True})
        self.assertEqual(output, "foo")

    @setup({"if-tag08": "{% if foo %}foo{% elif bar %}bar{% else %}nothing{% endif %}"})
    def test_if_tag08(self):
        output = self.engine.render_to_string("if-tag08", {"bar": True})
        self.assertEqual(output, "bar")

    @setup({"if-tag09": "{% if foo %}foo{% elif bar %}bar{% else %}nothing{% endif %}"})
    def test_if_tag09(self):
        output = self.engine.render_to_string("if-tag09")
        self.assertEqual(output, "nothing")

    @setup(
        {
            "if-tag10": (
                "{% if foo %}foo{% elif bar %}bar{% elif baz %}baz{% else %}nothing"
                "{% endif %}"
            )
        }
    )
    def test_if_tag10(self):
        output = self.engine.render_to_string("if-tag10", {"foo": True})
        self.assertEqual(output, "foo")

    @setup(
        {
            "if-tag11": (
                "{% if foo %}foo{% elif bar %}bar{% elif baz %}baz{% else %}nothing"
                "{% endif %}"
            )
        }
    )
    def test_if_tag11(self):
        output = self.engine.render_to_string("if-tag11", {"bar": True})
        self.assertEqual(output, "bar")

    @setup(
        {
            "if-tag12": (
                "{% if foo %}foo{% elif bar %}bar{% elif baz %}baz{% else %}nothing"
                "{% endif %}"
            )
        }
    )
    def test_if_tag12(self):
        output = self.engine.render_to_string("if-tag12", {"baz": True})
        self.assertEqual(output, "baz")

    @setup(
        {
            "if-tag13": (
                "{% if foo %}foo{% elif bar %}bar{% elif baz %}baz{% else %}nothing"
                "{% endif %}"
            )
        }
    )
    def test_if_tag13(self):
        output = self.engine.render_to_string("if-tag13")
        self.assertEqual(output, "nothing")

    # Filters
    @setup({"if-tag-filter01": "{% if foo|length == 5 %}yes{% else %}no{% endif %}"})
    def test_if_tag_filter01(self):
        output = self.engine.render_to_string("if-tag-filter01", {"foo": "abcde"})
        self.assertEqual(output, "yes")

    @setup({"if-tag-filter02": "{% if foo|upper == 'ABC' %}yes{% else %}no{% endif %}"})
    def test_if_tag_filter02(self):
        output = self.engine.render_to_string("if-tag-filter02")
        self.assertEqual(output, "no")

    # Equality
    @setup({"if-tag-eq01": "{% if foo == bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_eq01(self):
        output = self.engine.render_to_string("if-tag-eq01")
        self.assertEqual(output, "yes")

    @setup({"if-tag-eq02": "{% if foo == bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_eq02(self):
        output = self.engine.render_to_string("if-tag-eq02", {"foo": 1})
        self.assertEqual(output, "no")

    @setup({"if-tag-eq03": "{% if foo == bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_eq03(self):
        output = self.engine.render_to_string("if-tag-eq03", {"foo": 1, "bar": 1})
        self.assertEqual(output, "yes")

    @setup({"if-tag-eq04": "{% if foo == bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_eq04(self):
        output = self.engine.render_to_string("if-tag-eq04", {"foo": 1, "bar": 2})
        self.assertEqual(output, "no")

    @setup({"if-tag-eq05": "{% if foo == '' %}yes{% else %}no{% endif %}"})
    def test_if_tag_eq05(self):
        output = self.engine.render_to_string("if-tag-eq05")
        self.assertEqual(output, "no")

    # Inequality
    @setup({"if-tag-noteq01": "{% if foo != bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_noteq01(self):
        output = self.engine.render_to_string("if-tag-noteq01")
        self.assertEqual(output, "no")

    @setup({"if-tag-noteq02": "{% if foo != bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_noteq02(self):
        output = self.engine.render_to_string("if-tag-noteq02", {"foo": 1})
        self.assertEqual(output, "yes")

    @setup({"if-tag-noteq03": "{% if foo != bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_noteq03(self):
        output = self.engine.render_to_string("if-tag-noteq03", {"foo": 1, "bar": 1})
        self.assertEqual(output, "no")

    @setup({"if-tag-noteq04": "{% if foo != bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_noteq04(self):
        output = self.engine.render_to_string("if-tag-noteq04", {"foo": 1, "bar": 2})
        self.assertEqual(output, "yes")

    @setup({"if-tag-noteq05": '{% if foo != "" %}yes{% else %}no{% endif %}'})
    def test_if_tag_noteq05(self):
        output = self.engine.render_to_string("if-tag-noteq05")
        self.assertEqual(output, "yes")

    # Comparison
    @setup({"if-tag-gt-01": "{% if 2 > 1 %}yes{% else %}no{% endif %}"})
    def test_if_tag_gt_01(self):
        output = self.engine.render_to_string("if-tag-gt-01")
        self.assertEqual(output, "yes")

    @setup({"if-tag-gt-02": "{% if 1 > 1 %}yes{% else %}no{% endif %}"})
    def test_if_tag_gt_02(self):
        output = self.engine.render_to_string("if-tag-gt-02")
        self.assertEqual(output, "no")

    @setup({"if-tag-gte-01": "{% if 1 >= 1 %}yes{% else %}no{% endif %}"})
    def test_if_tag_gte_01(self):
        output = self.engine.render_to_string("if-tag-gte-01")
        self.assertEqual(output, "yes")

    @setup({"if-tag-gte-02": "{% if 1 >= 2 %}yes{% else %}no{% endif %}"})
    def test_if_tag_gte_02(self):
        output = self.engine.render_to_string("if-tag-gte-02")
        self.assertEqual(output, "no")

    @setup({"if-tag-lt-01": "{% if 1 < 2 %}yes{% else %}no{% endif %}"})
    def test_if_tag_lt_01(self):
        output = self.engine.render_to_string("if-tag-lt-01")
        self.assertEqual(output, "yes")

    @setup({"if-tag-lt-02": "{% if 1 < 1 %}yes{% else %}no{% endif %}"})
    def test_if_tag_lt_02(self):
        output = self.engine.render_to_string("if-tag-lt-02")
        self.assertEqual(output, "no")

    @setup({"if-tag-lte-01": "{% if 1 <= 1 %}yes{% else %}no{% endif %}"})
    def test_if_tag_lte_01(self):
        output = self.engine.render_to_string("if-tag-lte-01")
        self.assertEqual(output, "yes")

    @setup({"if-tag-lte-02": "{% if 2 <= 1 %}yes{% else %}no{% endif %}"})
    def test_if_tag_lte_02(self):
        output = self.engine.render_to_string("if-tag-lte-02")
        self.assertEqual(output, "no")

    # Contains
    @setup({"if-tag-in-01": "{% if 1 in x %}yes{% else %}no{% endif %}"})
    def test_if_tag_in_01(self):
        output = self.engine.render_to_string("if-tag-in-01", {"x": [1]})
        self.assertEqual(output, "yes")

    @setup({"if-tag-in-02": "{% if 2 in x %}yes{% else %}no{% endif %}"})
    def test_if_tag_in_02(self):
        output = self.engine.render_to_string("if-tag-in-02", {"x": [1]})
        self.assertEqual(output, "no")

    @setup({"if-tag-not-in-01": "{% if 1 not in x %}yes{% else %}no{% endif %}"})
    def test_if_tag_not_in_01(self):
        output = self.engine.render_to_string("if-tag-not-in-01", {"x": [1]})
        self.assertEqual(output, "no")

    @setup({"if-tag-not-in-02": "{% if 2 not in x %}yes{% else %}no{% endif %}"})
    def test_if_tag_not_in_02(self):
        output = self.engine.render_to_string("if-tag-not-in-02", {"x": [1]})
        self.assertEqual(output, "yes")

    # AND
    @setup({"if-tag-and01": "{% if foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_and01(self):
        output = self.engine.render_to_string(
            "if-tag-and01", {"foo": True, "bar": True}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-and02": "{% if foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_and02(self):
        output = self.engine.render_to_string(
            "if-tag-and02", {"foo": True, "bar": False}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-and03": "{% if foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_and03(self):
        output = self.engine.render_to_string(
            "if-tag-and03", {"foo": False, "bar": True}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-and04": "{% if foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_and04(self):
        output = self.engine.render_to_string(
            "if-tag-and04", {"foo": False, "bar": False}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-and05": "{% if foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_and05(self):
        output = self.engine.render_to_string("if-tag-and05", {"foo": False})
        self.assertEqual(output, "no")

    @setup({"if-tag-and06": "{% if foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_and06(self):
        output = self.engine.render_to_string("if-tag-and06", {"bar": False})
        self.assertEqual(output, "no")

    @setup({"if-tag-and07": "{% if foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_and07(self):
        output = self.engine.render_to_string("if-tag-and07", {"foo": True})
        self.assertEqual(output, "no")

    @setup({"if-tag-and08": "{% if foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_and08(self):
        output = self.engine.render_to_string("if-tag-and08", {"bar": True})
        self.assertEqual(output, "no")

    # OR
    @setup({"if-tag-or01": "{% if foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_or01(self):
        output = self.engine.render_to_string("if-tag-or01", {"foo": True, "bar": True})
        self.assertEqual(output, "yes")

    @setup({"if-tag-or02": "{% if foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_or02(self):
        output = self.engine.render_to_string(
            "if-tag-or02", {"foo": True, "bar": False}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-or03": "{% if foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_or03(self):
        output = self.engine.render_to_string(
            "if-tag-or03", {"foo": False, "bar": True}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-or04": "{% if foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_or04(self):
        output = self.engine.render_to_string(
            "if-tag-or04", {"foo": False, "bar": False}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-or05": "{% if foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_or05(self):
        output = self.engine.render_to_string("if-tag-or05", {"foo": False})
        self.assertEqual(output, "no")

    @setup({"if-tag-or06": "{% if foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_or06(self):
        output = self.engine.render_to_string("if-tag-or06", {"bar": False})
        self.assertEqual(output, "no")

    @setup({"if-tag-or07": "{% if foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_or07(self):
        output = self.engine.render_to_string("if-tag-or07", {"foo": True})
        self.assertEqual(output, "yes")

    @setup({"if-tag-or08": "{% if foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_or08(self):
        output = self.engine.render_to_string("if-tag-or08", {"bar": True})
        self.assertEqual(output, "yes")

    @setup({"if-tag-or09": "{% if foo or bar or baz %}yes{% else %}no{% endif %}"})
    def test_if_tag_or09(self):
        """
        multiple ORs
        """
        output = self.engine.render_to_string("if-tag-or09", {"baz": True})
        self.assertEqual(output, "yes")

    # NOT
    @setup({"if-tag-not01": "{% if not foo %}no{% else %}yes{% endif %}"})
    def test_if_tag_not01(self):
        output = self.engine.render_to_string("if-tag-not01", {"foo": True})
        self.assertEqual(output, "yes")

    @setup({"if-tag-not02": "{% if not not foo %}no{% else %}yes{% endif %}"})
    def test_if_tag_not02(self):
        output = self.engine.render_to_string("if-tag-not02", {"foo": True})
        self.assertEqual(output, "no")

    @setup({"if-tag-not06": "{% if foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not06(self):
        output = self.engine.render_to_string("if-tag-not06")
        self.assertEqual(output, "no")

    @setup({"if-tag-not07": "{% if foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not07(self):
        output = self.engine.render_to_string(
            "if-tag-not07", {"foo": True, "bar": True}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not08": "{% if foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not08(self):
        output = self.engine.render_to_string(
            "if-tag-not08", {"foo": True, "bar": False}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not09": "{% if foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not09(self):
        output = self.engine.render_to_string(
            "if-tag-not09", {"foo": False, "bar": True}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not10": "{% if foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not10(self):
        output = self.engine.render_to_string(
            "if-tag-not10", {"foo": False, "bar": False}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not11": "{% if not foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not11(self):
        output = self.engine.render_to_string("if-tag-not11")
        self.assertEqual(output, "no")

    @setup({"if-tag-not12": "{% if not foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not12(self):
        output = self.engine.render_to_string(
            "if-tag-not12", {"foo": True, "bar": True}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not13": "{% if not foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not13(self):
        output = self.engine.render_to_string(
            "if-tag-not13", {"foo": True, "bar": False}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not14": "{% if not foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not14(self):
        output = self.engine.render_to_string(
            "if-tag-not14", {"foo": False, "bar": True}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not15": "{% if not foo and bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not15(self):
        output = self.engine.render_to_string(
            "if-tag-not15", {"foo": False, "bar": False}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not16": "{% if foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not16(self):
        output = self.engine.render_to_string("if-tag-not16")
        self.assertEqual(output, "yes")

    @setup({"if-tag-not17": "{% if foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not17(self):
        output = self.engine.render_to_string(
            "if-tag-not17", {"foo": True, "bar": True}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not18": "{% if foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not18(self):
        output = self.engine.render_to_string(
            "if-tag-not18", {"foo": True, "bar": False}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not19": "{% if foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not19(self):
        output = self.engine.render_to_string(
            "if-tag-not19", {"foo": False, "bar": True}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not20": "{% if foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not20(self):
        output = self.engine.render_to_string(
            "if-tag-not20", {"foo": False, "bar": False}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not21": "{% if not foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not21(self):
        output = self.engine.render_to_string("if-tag-not21")
        self.assertEqual(output, "yes")

    @setup({"if-tag-not22": "{% if not foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not22(self):
        output = self.engine.render_to_string(
            "if-tag-not22", {"foo": True, "bar": True}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not23": "{% if not foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not23(self):
        output = self.engine.render_to_string(
            "if-tag-not23", {"foo": True, "bar": False}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not24": "{% if not foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not24(self):
        output = self.engine.render_to_string(
            "if-tag-not24", {"foo": False, "bar": True}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not25": "{% if not foo or bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not25(self):
        output = self.engine.render_to_string(
            "if-tag-not25", {"foo": False, "bar": False}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not26": "{% if not foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not26(self):
        output = self.engine.render_to_string("if-tag-not26")
        self.assertEqual(output, "yes")

    @setup({"if-tag-not27": "{% if not foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not27(self):
        output = self.engine.render_to_string(
            "if-tag-not27", {"foo": True, "bar": True}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not28": "{% if not foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not28(self):
        output = self.engine.render_to_string(
            "if-tag-not28", {"foo": True, "bar": False}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not29": "{% if not foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not29(self):
        output = self.engine.render_to_string(
            "if-tag-not29", {"foo": False, "bar": True}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not30": "{% if not foo and not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not30(self):
        output = self.engine.render_to_string(
            "if-tag-not30", {"foo": False, "bar": False}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not31": "{% if not foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not31(self):
        output = self.engine.render_to_string("if-tag-not31")
        self.assertEqual(output, "yes")

    @setup({"if-tag-not32": "{% if not foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not32(self):
        output = self.engine.render_to_string(
            "if-tag-not32", {"foo": True, "bar": True}
        )
        self.assertEqual(output, "no")

    @setup({"if-tag-not33": "{% if not foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not33(self):
        output = self.engine.render_to_string(
            "if-tag-not33", {"foo": True, "bar": False}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not34": "{% if not foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not34(self):
        output = self.engine.render_to_string(
            "if-tag-not34", {"foo": False, "bar": True}
        )
        self.assertEqual(output, "yes")

    @setup({"if-tag-not35": "{% if not foo or not bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_not35(self):
        output = self.engine.render_to_string(
            "if-tag-not35", {"foo": False, "bar": False}
        )
        self.assertEqual(output, "yes")

    # Various syntax errors
    @setup({"if-tag-error01": "{% if %}yes{% endif %}"})
    def test_if_tag_error01(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template("if-tag-error01")

    @setup({"if-tag-error02": "{% if foo and %}yes{% else %}no{% endif %}"})
    def test_if_tag_error02(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.render_to_string("if-tag-error02", {"foo": True})

    @setup({"if-tag-error03": "{% if foo or %}yes{% else %}no{% endif %}"})
    def test_if_tag_error03(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.render_to_string("if-tag-error03", {"foo": True})

    @setup({"if-tag-error04": "{% if not foo and %}yes{% else %}no{% endif %}"})
    def test_if_tag_error04(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.render_to_string("if-tag-error04", {"foo": True})

    @setup({"if-tag-error05": "{% if not foo or %}yes{% else %}no{% endif %}"})
    def test_if_tag_error05(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.render_to_string("if-tag-error05", {"foo": True})

    @setup({"if-tag-error06": "{% if abc def %}yes{% endif %}"})
    def test_if_tag_error06(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template("if-tag-error06")

    @setup({"if-tag-error07": "{% if not %}yes{% endif %}"})
    def test_if_tag_error07(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template("if-tag-error07")

    @setup({"if-tag-error08": "{% if and %}yes{% endif %}"})
    def test_if_tag_error08(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template("if-tag-error08")

    @setup({"if-tag-error09": "{% if or %}yes{% endif %}"})
    def test_if_tag_error09(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template("if-tag-error09")

    @setup({"if-tag-error10": "{% if == %}yes{% endif %}"})
    def test_if_tag_error10(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template("if-tag-error10")

    @setup({"if-tag-error11": "{% if 1 == %}yes{% endif %}"})
    def test_if_tag_error11(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template("if-tag-error11")

    @setup({"if-tag-error12": "{% if a not b %}yes{% endif %}"})
    def test_if_tag_error12(self):
        with self.assertRaises(TemplateSyntaxError):
            self.engine.get_template("if-tag-error12")

    @setup(
        {
            "else-if-tag-error01": (
                "{% if foo is bar %} yes {% else if foo is not bar %} no {% endif %}"
            )
        }
    )
    def test_else_if_tag_error01(self):
        error_message = 'Malformed template tag at line 1: "else if foo is not bar"'
        with self.assertRaisesMessage(TemplateSyntaxError, error_message):
            self.engine.get_template("else-if-tag-error01")

    @setup(
        {
            "if-tag-shortcircuit01": (
                "{% if x.is_true or x.is_bad %}yes{% else %}no{% endif %}"
            )
        }
    )
    def test_if_tag_shortcircuit01(self):
        """
        If evaluations are shortcircuited where possible
        """
        output = self.engine.render_to_string("if-tag-shortcircuit01", {"x": TestObj()})
        self.assertEqual(output, "yes")

    @setup(
        {
            "if-tag-shortcircuit02": (
                "{% if x.is_false and x.is_bad %}yes{% else %}no{% endif %}"
            )
        }
    )
    def test_if_tag_shortcircuit02(self):
        """
        The is_bad() function should not be evaluated. If it is, an
        exception is raised.
        """
        output = self.engine.render_to_string("if-tag-shortcircuit02", {"x": TestObj()})
        self.assertEqual(output, "no")

    @setup({"if-tag-badarg01": "{% if x|default_if_none:y %}yes{% endif %}"})
    def test_if_tag_badarg01(self):
        """Nonexistent args"""
        output = self.engine.render_to_string("if-tag-badarg01")
        self.assertEqual(output, "")

    @setup({"if-tag-badarg02": "{% if x|default_if_none:y %}yes{% endif %}"})
    def test_if_tag_badarg02(self):
        output = self.engine.render_to_string("if-tag-badarg02", {"y": 0})
        self.assertEqual(output, "")

    @setup({"if-tag-badarg03": "{% if x|default_if_none:y %}yes{% endif %}"})
    def test_if_tag_badarg03(self):
        output = self.engine.render_to_string("if-tag-badarg03", {"y": 1})
        self.assertEqual(output, "yes")

    @setup(
        {"if-tag-badarg04": "{% if x|default_if_none:y %}yes{% else %}no{% endif %}"}
    )
    def test_if_tag_badarg04(self):
        output = self.engine.render_to_string("if-tag-badarg04")
        self.assertEqual(output, "no")

    @setup({"if-tag-single-eq": "{% if foo = bar %}yes{% else %}no{% endif %}"})
    def test_if_tag_single_eq(self):
        # A single equals sign is a syntax error.
        with self.assertRaises(TemplateSyntaxError):
            self.engine.render_to_string("if-tag-single-eq", {"foo": 1})

    @setup({"template": "{% if foo is True %}yes{% else %}no{% endif %}"})
    def test_if_is_match(self):
        output = self.engine.render_to_string("template", {"foo": True})
        self.assertEqual(output, "yes")

    @setup({"template": "{% if foo is True %}yes{% else %}no{% endif %}"})
    def test_if_is_no_match(self):
        output = self.engine.render_to_string("template", {"foo": 1})
        self.assertEqual(output, "no")

    @setup({"template": "{% if foo is bar %}yes{% else %}no{% endif %}"})
    def test_if_is_variable_missing(self):
        output = self.engine.render_to_string("template", {"foo": 1})
        self.assertEqual(output, "no")

    @setup({"template": "{% if foo is bar %}yes{% else %}no{% endif %}"})
    def test_if_is_both_variables_missing(self):
        output = self.engine.render_to_string("template", {})
        self.assertEqual(output, "yes")

    @setup({"template": "{% if foo is not None %}yes{% else %}no{% endif %}"})
    def test_if_is_not_match(self):
        # For this to act as a regression test, it's important not to use
        # foo=True because True is (not None)
        output = self.engine.render_to_string("template", {"foo": False})
        self.assertEqual(output, "yes")

    @setup({"template": "{% if foo is not None %}yes{% else %}no{% endif %}"})
    def test_if_is_not_no_match(self):
        output = self.engine.render_to_string("template", {"foo": None})
        self.assertEqual(output, "no")

    @setup({"template": "{% if foo is not bar %}yes{% else %}no{% endif %}"})
    def test_if_is_not_variable_missing(self):
        output = self.engine.render_to_string("template", {"foo": False})
        self.assertEqual(output, "yes")

    @setup({"template": "{% if foo is not bar %}yes{% else %}no{% endif %}"})
    def test_if_is_not_both_variables_missing(self):
        output = self.engine.render_to_string("template", {})
        self.assertEqual(output, "no")


class IfNodeTests(SimpleTestCase):
    def test_repr(self):
        node = IfNode(conditions_nodelists=[])
        self.assertEqual(repr(node), "<IfNode>")