As screenshot, errors are shown when a @IsTest is on the same line of a test method

[Peter Lin]

And the auto complete does not prompt "static" properly.

[Scott Wells]

Peter, in the example you show the syntax is invalid. You have an annotation, a modifier, and a return type, but no method name or params. If you finish the method signature the errors should go away.

[Scott Wells]

I think this is working properly. Please feel free to reopen if you see it happen with valid Apex.

[Peter Lin]

Thank you, Scott.

Yes. After I have typed in the method name, the errors went away. I should not say it is a bug. It just shows errors before completing the method name. Thanks again.