Service Dialog Element Type tests

You could do something like this.....

```python
# Set up mapping for extra fields
mapping = {"Text Box": ['default_text_box', 'some_other_field'], ..........}

# Check mapping choice is in the mapping dict
if self.choose_type in mapping:
    m_dict = {'ele_label': self.ele_label,
    'ele_name': self.ele_name,
    'ele_desc': self.ele_desc,
    'choose_type': self.choose_type}
    # Iterate through the extra "simple" fields
    for attribute in mapping[self.choose_type]:
        m_dict[attribute] = getattr(self, self.choose_type)
fill(element_form, m_dict)

# Then deal with special cases after this that need extra clicks or other things
```