test checking if rendered inital value of the custom field is valid

smash/web/forms/study_subject_forms.py

@@ -63,7 +63,7 @@ def create_field_for_custom_study_subject_field(study_subject_field: CustomStudy
                                     required=study_subject_field.obligatory, disabled=study_subject_field.readonly,
                                     widget=forms.DateInput(DATEPICKER_DATE_ATTRS, "%Y-%m-%d"))
     elif study_subject_field.type == CUSTOM_FIELD_TYPE_SELECT_LIST:
-        initial = None
+        initial = '0'
         for v, k in get_custom_select_choices(study_subject_field.possible_values):
             if k == val:
                 initial = v

smash/web/tests/forms/test_StudySubjectEditForm.py

@@ -5,7 +5,7 @@ from parameterized import parameterized
 from web.forms import StudySubjectEditForm
 from web.models import StudySubject
 from web.models.constants import CUSTOM_FIELD_TYPE_TEXT, CUSTOM_FIELD_TYPE_BOOLEAN, CUSTOM_FIELD_TYPE_INTEGER, \
-    CUSTOM_FIELD_TYPE_DOUBLE, CUSTOM_FIELD_TYPE_DATE, CUSTOM_FIELD_TYPE_SELECT_LIST
+    CUSTOM_FIELD_TYPE_DOUBLE, CUSTOM_FIELD_TYPE_DATE, CUSTOM_FIELD_TYPE_SELECT_LIST, CUSTOM_FIELD_TYPE_FILE
 from web.models.custom_data import CustomStudySubjectField
 from web.models.custom_data.custom_study_subject_field import get_study_subject_field_id
 from web.tests import LoggedInWithWorkerTestCase
@@ -82,6 +82,24 @@ class StudySubjectEditFormTests(LoggedInWithWorkerTestCase):
 
         self.assertEqual(expected_serialized_value, subject.get_custom_data_value(field).value)
 
+    @parameterized.expand([
+        ('text', CUSTOM_FIELD_TYPE_TEXT, 'bla', 'bla'),
+        ('bool', CUSTOM_FIELD_TYPE_BOOLEAN, True, 'True'),
+        ('int', CUSTOM_FIELD_TYPE_INTEGER, 10, '10'),
+        ('double', CUSTOM_FIELD_TYPE_DOUBLE, 30.5, '30.5'),
+        ('date', CUSTOM_FIELD_TYPE_DATE, '2020-11-05', '2020-11-05'),
+        ('select list', CUSTOM_FIELD_TYPE_SELECT_LIST, '1', 'BLA', 'BLA;BLA-BLA'),
+        ('select list empty value', CUSTOM_FIELD_TYPE_SELECT_LIST, '0', '', 'BLA;BLA-BLA'),
+        ('file', CUSTOM_FIELD_TYPE_FILE, 'bla.txt', 'bla.txt'),
+    ])
+    def test_initial_edit_with_custom_field(self, _, field_type, expected_initial_value, value, possible_values=''):
+        field = CustomStudySubjectField.objects.create(study=get_test_study(), default_value=value,
+                                                       type=field_type, possible_values=possible_values)
+
+        form = StudySubjectEditForm(instance=self.study_subject)
+
+        self.assertTrue(form[get_study_subject_field_id(field)].initial, expected_initial_value)
+
     def test_invalid_mpower_id_edit(self):
         self.study_subject.mpower_id = "mpower_002"
         self.study_subject.nd_number = "ND0002"