'test:start' 事件
data
<Object>file
<string> | <undefined> 测试文件的路径,如果测试未通过文件运行则未定义。name
<string> 测试名称。nesting
<number> 测试的嵌套级别。
测试开始时发出。
data
<Object>file
<string> | <undefined> The path of the test file, undefined if test is not ran through a file.name
<string> The test name.nesting
<number> The nesting level of the test.
Emitted when a test starts.