Junit is not working

Hi,
1. i've downloaded junit-4.12.jar file
2. Then right click on the project->Java Build Path->Add External Jars->Found jar file and added it to the project
Didn't work

Then:
1. I went to Add Library and added JUnit library to the project
Didn't work

i even reinstall Eclipse -- Same result
when i hover over on [@Test] i'm getting error (see attached)
in attached screen shot you can see that junit jar file and library are attached to the project.
So why it's not working? What i'm doing wrong?

Thanks