Python forms.ClearableFileInput類代碼示例

    def test_clear_input_checked_returns_false_only_if_not_required(self):
        """
        ClearableFileInput.value_from_datadict never returns False if the field
        is required.
        """
        widget = ClearableFileInput()
        widget.is_required = True
        field = SimpleUploadedFile("something.txt", b"content")

        value = widget.value_from_datadict(data={"myfile-clear": True}, files={"myfile": field}, name="myfile")
        self.assertEqual(value, field)

 def test_render_custom_template(self):
     widget = ClearableFileInput()
     widget.template_with_initial = (
         '%(initial_text)s: <img src="%(initial_url)s" alt="%(initial)s" /> '
         '%(clear_template)s<br />%(input_text)s: %(input)s'
     )
     self.assertHTMLEqual(
         widget.render('myfile', FakeFieldFile()),
         'Currently: <img src="something" alt="something" /> '
         '<input type="checkbox" name="myfile-clear" id="myfile-clear_id" /> '
         '<label for="myfile-clear_id">Clear</label><br />Change: <input type="file" name="myfile" />'
     )

 def test_clear_input_renders_only_if_not_required(self):
     """
     A ClearableFileInput with is_required=False does not render a clear
     checkbox.
     """
     widget = ClearableFileInput()
     widget.is_required = True
     self.check_html(widget, 'myfile', FakeFieldFile(), html=(
         """
         Currently: <a href="something">something</a> <br>
         Change: <input type="file" name="myfile">
         """
     ))

    def test_html_does_not_mask_exceptions(self):
        """
        A ClearableFileInput should not mask exceptions produced while
        checking that it has a value.
        """
        @python_2_unicode_compatible
        class FailingURLFieldFile(object):
            @property
            def url(self):
                raise RuntimeError('Canary')

            def __str__(self):
                return 'value'

        widget = ClearableFileInput()
        field = FailingURLFieldFile()
        with self.assertRaisesMessage(RuntimeError, 'Canary'):
            widget.render('myfile', field)

    def test_html_escaped(self):
        """
        A ClearableFileInput should escape name, filename, and URL
        when rendering HTML (#15182).
        """
        @python_2_unicode_compatible
        class StrangeFieldFile(object):
            url = "something?chapter=1&sect=2&copy=3&lang=en"

            def __str__(self):
                return '''something<div onclick="alert('oops')">.jpg'''

        widget = ClearableFileInput()
        field = StrangeFieldFile()
        output = widget.render('my<div>file', field)
        self.assertNotIn(field.url, output)
        self.assertIn('href="something?chapter=1&amp;sect=2&amp;copy=3&amp;lang=en"', output)
        self.assertNotIn(six.text_type(field), output)
        self.assertIn('something&lt;div onclick=&quot;alert(&#39;oops&#39;)&quot;&gt;.jpg', output)
        self.assertIn('my&lt;div&gt;file', output)
        self.assertNotIn('my<div>file', output)

 def test_value_omitted_from_data(self):
     widget = ClearableFileInput()
     self.assertIs(widget.value_omitted_from_data({}, {}, 'field'), True)
     self.assertIs(widget.value_omitted_from_data({}, {'field': 'x'}, 'field'), False)
     self.assertIs(widget.value_omitted_from_data({'field-clear': 'y'}, {}, 'field'), False)

 def render(self, name, value, attrs=None):
     output = ClearableFileInput.render(self, name, value, attrs)
     output += self.output_extra_data(value)
     return mark_safe(output)

    def test_accept(self):
        widget = ClearableFileInput()
        assert 'accept' not in widget.render(name='file', value='test.jpg')
        assert ["starts-with", "$Content-Type", ""] in widget.get_conditions(None)

        widget = ClearableFileInput(attrs={'accept': 'image/*'})
        assert 'accept="image/*"' in widget.render(name='file', value='test.jpg')
        assert ["starts-with", "$Content-Type", "image/"] in widget.get_conditions('image/*')

        widget = ClearableFileInput(attrs={'accept': 'image/jpeg'})
        assert 'accept="image/jpeg"' in widget.render(name='file', value='test.jpg')
        assert {"Content-Type": 'image/jpeg'} in widget.get_conditions('image/jpeg')

        widget = ClearableFileInput(attrs={'accept': 'application/pdf,image/*'})
        assert 'accept="application/pdf,image/*"' in widget.render(name='file', value='test.jpg')
        assert ["starts-with", "$Content-Type", ""] in widget.get_conditions(
            'application/pdf,image/*')
        assert {"Content-Type": 'application/pdf'} not in widget.get_conditions(
            'application/pdf,image/*')