tdd-workshop-exercises/password_validator

Feature A — Password Validator

Your goal

Implement PasswordValidator using strict TDD. Do not write any production code before you have a failing test.

Rules to implement (in order)

Step	Rule	Error message
1	At least 8 characters long	Must be at least 8 characters long
2	At least one uppercase letter (A–Z)	Must contain at least one uppercase letter
3	At least one digit (0–9)	Must contain at least one digit
4	At least one special character (!@#$%^&*)	Must contain at least one special character (!@#$%^&*)
5	No spaces	Must not contain spaces
6	All errors reported at once (refactor)	—

The rhythm — repeat for every rule

1. Uncomment the next test → run → watch it FAIL (Red)
2. Write the minimum code to make it pass → run → GREEN
3. Refactor if needed → run → still GREEN
4. Move to the next test

Running the tests

dart pub get
dart test

Files

• lib/password_validator.dart — your implementation goes here
• test/password_validator_test.dart — uncomment tests one at a time

Hint for Step 6 (the refactor insight)

Once all 5 rules pass, you'll likely have 5 separate if blocks in validate(). Think about how to represent each rule as data instead of code. What if each rule were just a function in a list?