Testing & Debugging Flashcards
What is the definition of Unit Testing?
Testing individual UNITS of code to determine whether they are FIT to use.
Is Unit Testing a method of White or Black Box testing and why?
It’s White Box Testing as the STRUCTURE of the code fragment is tested rather than the FUNCTIONALITY
Steps to replicating and fixing issues during unit testing? (4)
- Manually replicate issue
- FIND or WRITE failing tests
- FIX production code
- Check tests PASS
Definition of testing?
a PROCESS intended to SHOW that a computer system (hardware & or software) DOES or DOESN’T work
Definition of debugging?
the PROCESS of FINDING and FIXING ERRORS in a computer system so that it behaves as expected.
Should unit tests rely on each other?
No they should each be INDEPENDENT. The test case methods should give the same result regardless of the ORDER in which they are executed.
Should test case methods start with the word “test”?
Not necessarily
After failing tests show the problem exists, what strategies can we use to isolate the source? (5)
Architectural Back tracking Brute Force Binary Search Cause Elimination
After deciding on a debugging strategy we must pick a tactic, our options? (8)
Print Statements Rubber Ducking Minimise execution path Looking for Common Problems Online Debugger Test Cases Git Commits & Blame Profiling
What does the Architectural debug strategy refer to?
Narrowing down the location in the ARCHITECTURE
Meaning of the Backtracking strategy?
Find ERROR LINE and WORK BACKWARDS through code till you find CAUSE 321 (1234567)
Meaning of Brute Force Strategy?
Read code from start to finish 1234567
Meaning of Binary Search strategy?
start at MIDDLE of execution 4
- if problem has manifested at this point look for error in 1234
- else in 4567
Meaning of Cause elimination?
- IDENTIFY all possible causes
- Rule them out one by one
Meaning of rubber ducking as a tactic?
Explain exactly what the code is doing to someone else
Meaning of profiling as a tactic?
Dynamic program analysis like in C (e.g memory or time complexity )
What is the 3 Layer Architecture in Stendhal? Where does middle out testing fit in?
Presentation Logic
Service Layer API : Acceptance test
Business Logic
Data Logic
How can you control the scope of a new feature to minimize risk (of regression) ?
Make the feature accessible to object(s) of a specific type at first
What is test first development?
Writing test first to use on stubs
Acceptance Test vs Unit
feature/design
customer/technology
specification/design
What is the anatomy of an automated test?
setup
execution
validation
cleanup
How is minimizing the scope a form of incremental development?
- bring simple (useable) version online first
- fix issues
- expand
- B class is ready
- A is supposed to call it
- A is not ready for testing yet
- solution??
Create a DRIVER for B , this can call B
Driver B -> B
later:
A->B
What is a Driver if you think about it hard enough?
The driver is actually a test for B. This is an example of test after dev
When is a stub of class B necessary?
when Test B is ready but B isn’t ready for testin’
Will test code with stubs compile?
Yas
What is the concept of Wishful Thinking?
When writing tests for code that doesn’t exist:
- decide what the “perfect classes/methods” would be like
- write the test AS THOUGH THEY EXIST
When are failing acceptance tests not a problem?
When the tests describe features that are needed but not yet fully implemented
When are failing acceptance tests a problem?
When they describe COMPLETED features that have been added to the game
Benefits of Test First approach?
- client-centred design
- we never “forget” to write tests
What is the only difference between TFirstD and TDrivenD?
Tests DRIVE the design
Red phase: design client API
Green: refactor
