code: def testBacktestingLog1(self):
      code = """from testcases import logger_test_1
  logger_test_1.main()
  """
      res = common.run_python_code(code)
      expectedLines = [
          "2000-01-01 00:00:00 strategy [INFO] bla",
          "2000-01-01 00:00:00 custom [INFO] ble",
      ]
      self.assertEqual(res.get_output_lines(), expectedLines)
      self.assertTrue(res.exit_ok())
  
imports: import datetime
  from testcases import common
label_desc: Use image node_id 1 for calling the TestCase obj's underlying member method code with example usage: obj.testBacktestingLog1() without return types