Tests "step in" functionality in debugger.
Set timer for test function.
Script execution paused.
Call stack:
0) testFunction (debugger-step-in.js:19)
Stepping into...
Script execution resumed.
Script execution paused.
Call stack:
0) testFunction (debugger-step-in.js:20)
Stepping into...
Script execution resumed.
Script execution paused.
Call stack:
0) d (debugger-step-in.js:14)
1) testFunction (debugger-step-in.js:20)
Script execution resumed.