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from django.core.files.uploadedfile import SimpleUploadedFile
from django.forms import FileField, FileInput, Form
from django.utils.datastructures import MultiValueDict
from .base import WidgetTest
class FileInputTest(WidgetTest):
widget = FileInput()
def test_render(self):
"""
FileInput widgets never render the value attribute. The old value
isn't useful if a form is updated or an error occurred.
"""
self.check_html(
self.widget,
"email",
"test@example.com",
html='<input type="file" name="email">',
)
self.check_html(
self.widget, "email", "", html='<input type="file" name="email">'
)
self.check_html(
self.widget, "email", None, html='<input type="file" name="email">'
)
def test_value_omitted_from_data(self):
self.assertIs(self.widget.value_omitted_from_data({}, {}, "field"), True)
self.assertIs(
self.widget.value_omitted_from_data({}, {"field": "value"}, "field"), False
)
def test_use_required_attribute(self):
# False when initial data exists. The file input is left blank by the
# user to keep the existing, initial value.
self.assertIs(self.widget.use_required_attribute(None), True)
self.assertIs(self.widget.use_required_attribute("resume.txt"), False)
def test_fieldset(self):
class TestForm(Form):
template_name = "forms_tests/use_fieldset.html"
field = FileField(widget=self.widget)
form = TestForm()
self.assertIs(self.widget.use_fieldset, False)
self.assertHTMLEqual(
'<div><label for="id_field">Field:</label><input id="id_field" '
'name="field" required type="file"></div>',
form.render(),
)
def test_multiple_error(self):
msg = "FileInput doesn't support uploading multiple files."
with self.assertRaisesMessage(ValueError, msg):
FileInput(attrs={"multiple": True})
def test_value_from_datadict_multiple(self):
class MultipleFileInput(FileInput):
allow_multiple_selected = True
file_1 = SimpleUploadedFile("something1.txt", b"content 1")
file_2 = SimpleUploadedFile("something2.txt", b"content 2")
# Uploading multiple files is allowed.
widget = MultipleFileInput(attrs={"multiple": True})
value = widget.value_from_datadict(
data={"name": "Test name"},
files=MultiValueDict({"myfile": [file_1, file_2]}),
name="myfile",
)
self.assertEqual(value, [file_1, file_2])
# Uploading multiple files is not allowed.
widget = FileInput()
value = widget.value_from_datadict(
data={"name": "Test name"},
files=MultiValueDict({"myfile": [file_1, file_2]}),
name="myfile",
)
self.assertEqual(value, file_2)
def test_multiple_default(self):
class MultipleFileInput(FileInput):
allow_multiple_selected = True
tests = [
(None, True),
({"class": "myclass"}, True),
({"multiple": False}, False),
]
for attrs, expected in tests:
with self.subTest(attrs=attrs):
widget = MultipleFileInput(attrs=attrs)
self.assertIs(widget.attrs["multiple"], expected)
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