new_contents: import wee_slack
  import pytest
  
  
  @pytest.mark.parametrize('case', (
      {
          'input_message': {'attachments': [{
              'title': 'Title',
          }]},
          'input_text_before': "Text before",
          'output': "\n".join([
              "",
              "Title",
          ]),
      },
      {
          'input_message': {'attachments': [{
              'title': 'Title',
              'text': 'Attachment text',
              'title_link': 'http://title.link',
              'from_url': 'http://from.url',
              'fallback': 'Fallback',
          }]},
          'input_text_before': "",
          'output': "\n".join([
              "Title (http://title.link)",
              "http://from.url",
              "Attachment text",
          ]),
      },
      {
          'input_message': {'attachments': [{
              'title': 'Title',
              'text': 'Attachment text',
              'title_link': 'http://link',
              'from_url': 'http://link',
          }]},
          'input_text_before': "http://link",
          'output': "\n".join([
              "",
              "Title",
              "Attachment text",
          ]),
      },
      {
          'input_message': {'attachments': [{
              'title': 'Title',
              'text': 'Attachment text\n\n\nWith multiple lines',
          }]},
          'input_text_before': "",
          'output': "\n".join([
              "Title",
              "Attachment text\nWith multiple lines",
          ]),
      },
      {
          'input_message': {'attachments': [{
              'title': 'Title',
              'author_name': 'Author',
              'pretext': 'Pretext',
              'text': 'Attachment text',
              'title_link': 'http://title.link',
              'from_url': 'http://from.url',
          }]},
          'input_text_before': "",
          'output': "\n".join([
              "Pretext",
              "Author: Title (http://title.link)",
              "http://from.url",
              "Attachment text",
          ]),
      },
      {
          'input_message': {'attachments': [{
              'author_name': 'Author',
              'text': 'Attachment text',
              'title_link': 'http://title.link',
              'from_url': 'http://from.url',
          }]},
          'input_text_before': "",
          'output': "\n".join([
              "http://from.url",
              "Author: Attachment text",
          ]),
      },
      {
          'input_message': {'attachments': [{
              'fallback': 'Fallback',
          }]},
          'input_text_before': "",
          'output': "Fallback",
      },
      {
          'input_message': {'attachments': [{
              'title': 'Title',
              'fields': [{
                  'title': 'First field title',
                  'value': 'First field value',
              }, {
                  'title': '',
                  'value': 'Second field value',
              }],
          }]},
          'input_text_before': "",
          'output': "\n".join([
              "Title",
              "First field title First field value",
              "Second field value",
          ]),
      },
  ))
  def test_unwrap_attachments(case):
      result = wee_slack.unwrap_attachments(
          case['input_message'], case['input_text_before'])
      assert result == case['output']
  
subject: Add tests for unwrap_attachments