text: import uuid
  
  import pytest
  from flask import json, current_app
  from freezegun import freeze_time
  from notifications_utils.url_safe_token import generate_token
  from tests import create_authorization_header
  
  
  @pytest.mark.parametrize('invitation_type', ['service', 'organisation'])
  def test_validate_invitation_token_for_expired_token_returns_400(client, invitation_type):
      with freeze_time('2016-01-01T12:00:00'):
          token = generate_token(str(uuid.uuid4()), current_app.config['SECRET_KEY'],
                                 current_app.config['DANGEROUS_SALT'])
      url = '/invite/{}/{}'.format(invitation_type, token)
      auth_header = create_authorization_header()
      response = client.get(url, headers=[('Content-Type', 'application/json'), auth_header])
  
      assert response.status_code == 400
      json_resp = json.loads(response.get_data(as_text=True))
      assert json_resp['result'] == 'error'
      assert json_resp['message'] == {
          'invitation': 'Your invitation to Catalyst Notify has expired. '
                        'Please ask the person that invited you to send you another one'}
  
  
  @pytest.mark.parametrize('invitation_type', ['service', 'organisation'])
  def test_validate_invitation_token_returns_200_when_token_valid(
          client, invitation_type, sample_invited_user, sample_invited_org_user
  ):
      invited_user = sample_invited_user if invitation_type == 'service' else sample_invited_org_user
  
      token = generate_token(str(invited_user.id), current_app.config['SECRET_KEY'],
                             current_app.config['DANGEROUS_SALT'])
      url = '/invite/{}/{}'.format(invitation_type, token)
      auth_header = create_authorization_header()
      response = client.get(url, headers=[('Content-Type', 'application/json'), auth_header])
  
      assert response.status_code == 200
      json_resp = json.loads(response.get_data(as_text=True))
      if invitation_type == 'service':
          assert json_resp['data']['id'] == str(sample_invited_user.id)
          assert json_resp['data']['email_address'] == sample_invited_user.email_address
          assert json_resp['data']['from_user'] == str(sample_invited_user.user_id)
          assert json_resp['data']['service'] == str(sample_invited_user.service_id)
          assert json_resp['data']['status'] == sample_invited_user.status
          assert json_resp['data']['permissions'] == sample_invited_user.permissions
          assert json_resp['data']['folder_permissions'] == sample_invited_user.folder_permissions
      if invitation_type == 'organisation':
          assert json_resp['data'] == sample_invited_org_user.serialize()
  
  
  @pytest.mark.parametrize('invitation_type', ['service', 'organisation'])
  def test_validate_invitation_token_returns_400_when_invited_user_does_not_exist(client, invitation_type):
      token = generate_token(str(uuid.uuid4()), current_app.config['SECRET_KEY'],
                             current_app.config['DANGEROUS_SALT'])
      url = '/invite/{}/{}'.format(invitation_type, token)
      auth_header = create_authorization_header()
      response = client.get(url, headers=[('Content-Type', 'application/json'), auth_header])
  
      assert response.status_code == 404
      json_resp = json.loads(response.get_data(as_text=True))
      assert json_resp['result'] == 'error'
      assert json_resp['message'] == 'No result found'
  
  
  @pytest.mark.parametrize('invitation_type', ['service', 'organisation'])
  def test_validate_invitation_token_returns_400_when_token_is_malformed(client, invitation_type):
      token = generate_token(
          str(uuid.uuid4()),
          current_app.config['SECRET_KEY'],
          current_app.config['DANGEROUS_SALT']
      )[:-2]
  
      url = '/invite/{}/{}'.format(invitation_type, token)
      auth_header = create_authorization_header()
      response = client.get(url, headers=[('Content-Type', 'application/json'), auth_header])
  
      assert response.status_code == 400
      json_resp = json.loads(response.get_data(as_text=True))
      assert json_resp['result'] == 'error'
      assert json_resp['message'] == {
          'invitation': 'Something’s wrong with this link. Make sure you’ve copied the whole thing.'
      }
  