Tests "step over" functionality in debugger.

Set timer for test function.
Script execution paused.
Call stack:
    0) d (debugger-step-over.js:17)
    1) testFunction (debugger-step-over.js:23)
Stepping over...
Script execution resumed.
Script execution paused.
Call stack:
    0) d (debugger-step-over.js:18)
    1) testFunction (debugger-step-over.js:23)
Stepping over...
Script execution resumed.
Script execution paused.
Call stack:
    0) d (debugger-step-over.js:19)
    1) testFunction (debugger-step-over.js:23)
Script execution resumed.