definizione_test.py

test = '''
    - algorithm: qgis:polygonstolines
      name: Test (qgis:polygonstolines)
      params:
          INPUT:
              name: polys.gml
              type: vector
      results:
          OUTPUT:
              name: expected/polys2lines.gml
              type: vector
'''
with open(os.path.join(repo_dir, definition_file), 'a') as f:
    f.write('\n\n' + test)