We all love when everything works smoothly…
But in real life, users don’t follow the perfect flow and that’s where most bugs hide. Many bugs appear only when users do something unexpected and testing only the “correct” flow hides many issues.
Why it matters:
- Users don’t always follow the ideal path.
- Unexpected inputs can reveal validation issues.
- Edge cases often expose hidden bugs in forms, workflows, and data handling.
How to test:
- Enter unexpected inputs
- Use special characters, long text, or unusual formats.
- Leave fields empty
- Verify if the system correctly validates required fields.
- Use boundary values
- Test very short or very long inputs.
- Try unusual combinations
- Fill some fields correctly while leaving others incorrect.
Real Example:
In a contact form, the system may only check if fields are filled.
A tester enters spaces or special characters like !!! in the “First Name” field, and the form still accepts it.
The Contact Form was submitted successfully, but the database now stores invalid customer data. This bug appears only when testing outside the happy path.
Pro Tip:
If you only test the happy path, you’re only testing the best-case scenario not the real user behaviour.
Always break the flow on purpose.