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Lib/site-packages/crispy_forms/tests/test_utils.py

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+from django import forms
+from django.template.base import Template
+from django.template.context import Context
+from django.test import SimpleTestCase
+
+from crispy_forms.helper import FormHelper
+from crispy_forms.layout import Layout
+from crispy_forms.tests.utils import contains_partial
+from crispy_forms.utils import list_difference, list_intersection, render_field
+
+
+def test_list_intersection():
+    assert list_intersection([1, 3], [2, 3]) == [3]
+
+
+def test_list_difference():
+    assert list_difference([3, 1, 2, 3], [4, 1]) == [3, 2]
+
+
+def test_render_field_with_none_field():
+    rendered = render_field(field=None, form=None, form_style=None, context=None)
+    assert rendered == ""
+
+
+def test_custom_bound_field():
+    from django.forms.boundfield import BoundField
+
+    extra = "xyxyxyxyxyx"
+
+    class CustomBoundField(BoundField):
+        @property
+        def auto_id(self):
+            return extra
+
+    class MyCharField(forms.CharField):
+        def get_bound_field(self, form, field_name):
+            return CustomBoundField(form, self, field_name)
+
+    class MyForm(forms.Form):
+        f = MyCharField()
+
+        def __init__(self, *args, **kwargs):
+            super().__init__(*args, **kwargs)
+            self.helper = FormHelper()
+            self.helper.layout = Layout("f")
+
+    template = Template('{% load crispy_forms_tags %}\n{% crispy form "bootstrap3" %}')
+    rendered = template.render(Context({"form": MyForm(data={"f": "something"})}))
+
+    assert extra in rendered
+
+
+def test_contains_partial():
+    c = SimpleTestCase()
+    needle = "<span></span>"
+    html = "<form>%s</form>"
+    c.assertTrue(contains_partial(html % needle, needle))
+
+    needle = "<span></span><b></b>"
+    c.assertRaises(NotImplementedError, contains_partial, html % needle, needle)
+
+    needle = "<span>a</span>"
+    c.assertRaises(NotImplementedError, contains_partial, html % needle, needle)
+
+    needle = '<span id="e"></span>'
+    html = '<form id="tt"><span id="f"></span>%s</form>'
+    c.assertTrue(contains_partial(html % needle, needle))
+
+    missing = "<script></script>"
+    c.assertFalse(contains_partial(html % missing, needle))
+
+    needle = '<span id="e"></span>'
+    html = '<form id="tt"><span id="f"></span>%s</form>'
+    missing = '<span id="g"></span>'
+    c.assertFalse(contains_partial(html % missing, needle))
+
+    needle = '<div id="r"><span>toto</span></div>'
+    html = '<form><div id="r"></div></form>'
+    c.assertRaises(NotImplementedError, contains_partial, html, needle)
+    # as we do not look at the children, needle is equivalent to <div id="r"></div> which IS in html
+    c.assertTrue(contains_partial(html, needle, ignore_needle_children=True))