Add test for placeholder

Author: benmurden

testapp/forms.py

@@ -9,7 +9,7 @@ class TelForm(forms.Form):
 
 class TelFormAttrs(forms.Form):
     tel_number = forms.CharField(widget=IntlTelInputWidget(
-        attrs={'title': 'Telephone number'},
+        attrs={'title': 'Telephone number', 'placeholder': 'foobar'},
         preferred_countries=['jp'],
         default_code='jp'
     ))

testapp/tests.py

@@ -50,6 +50,7 @@ def test_with_attrs(self):
         self.assertIn('data-default-code="jp"', r.content.decode('utf-8'))
         self.assertIn('data-preferred-countries="["jp"]"',
                       r.content.decode('utf-8'))
+        self.assertIn('placeholder="foobar"', r.content.decode('utf-8'))
 
     def test_with_initial(self):
         r = self.client.get('/initial-test/')