Test Calculator Edge Cases

Task

Test the situations most likely to expose bugs in calculator state.

Test these cases

Repeated decimal

Enter:

1.2.3

The calculator should not create an invalid number.

Divide by zero

Try:

10 ÷ 0 =

The application should handle the error without producing Infinity as a normal result.

Clear during a calculation

Try:

25 +

Then press C.

The calculator should return to its initial state.

Backspace at zero

Press Backspace when the display is 0.

It should remain 0.

Operator without a second number

Enter:

8 + =

The calculator should not crash.

Start a new number after equals

Try:

5 + 5 =

Then immediately enter:

2

The new input should begin a new number instead of silently becoming 102.

Test

Use both mouse and keyboard input for the cases where keyboard support applies.

Check the browser console for unexpected errors.

Checkpoint

The calculator handles common edge cases without corrupting its state or crashing the application.