from django.forms import ChoiceField, Field, Form, Select

from django.test import SimpleTestCase

class BasicFieldsTests(SimpleTestCase):

    def test_field_sets_widget_is_required(self):

        self.assertTrue(Field(required=True).widget.is_required)

        self.assertFalse(Field(required=False).widget.is_required)

    def test_cooperative_multiple_inheritance(self):

        class A:

            def __init__(self):

                self.class_a_var = True

                super().__init__()

        class ComplexField(Field, A):

            def __init__(self):

                super().__init__()

        f = ComplexField()

        self.assertTrue(f.class_a_var)

    def test_field_deepcopies_widget_instance(self):

        class CustomChoiceField(ChoiceField):

            widget = Select(attrs={"class": "my-custom-class"})

        class TestForm(Form):

            field1 = CustomChoiceField(choices=[])

            field2 = CustomChoiceField(choices=[])

        f = TestForm()

        f.fields["field1"].choices = [("1", "1")]

        f.fields["field2"].choices = [("2", "2")]

        self.assertEqual(f.fields["field1"].widget.choices, [("1", "1")])

        self.assertEqual(f.fields["field2"].widget.choices, [("2", "2")])

class DisabledFieldTests(SimpleTestCase):

    def test_disabled_field_has_changed_always_false(self):

        disabled_field = Field(disabled=True)

        self.assertFalse(disabled_field.has_changed("x", "y"))