AttributeError: module 'HtmlTestRunner' has no attribute 'HTMLTestRunner'

[yatouxingren]

• HtmlTestRunner version:1.2.1
• Python version:3.7.8
• Operating System:windows

Description

运行unittest报告 报错AttributeError: module 'HtmlTestRunner' has no attribute 'HTMLTestRunner'

代码如下
test_case = unittest.TestLoader().loadTestsFromName(self.case)
suite = unittest.TestSuite()
suite.addTest(test_case)
runner = HtmlTestRunner.HTMLTestRunner(output=report_dir, report_title=self.case)
result = runner.run(suite)