Step Into is a debugger command that enters the function currently being called, so you can follow its statements one at a time and inspect what happens inside. section 36.3
Finding the missing case
Set a breakpoint, start debugging, and go to that breakpoint. When a test calls absolute_value(0), click Step Into. The variable explorer shows n = 0. Stepping twice more reaches the conditional branches: n is neither less than nor greater than 0, so no return statement runs and the function returns None. section 36.3
Use Step Into when a failing test may be caused inside a function call:
- Set a breakpoint at an appropriate line. section 36.3
- Run the debugger and continue to the breakpoint. section 36.3
- Step into the function and continue until the incorrect behavior becomes visible. section 36.3
