The document discusses different types of software testing including unit testing. It provides an overview of unit testing, how to write good unit tests, examples of unit testing FizzBuzz and Rock Paper Scissors Lizard Spock, and how to do unit testing on Android including mocking and test-driven development. It also briefly discusses test automation and using Calabash for cross-platform mobile app testing.

2. Jose García
@jgarciabt
Manuel Vivo
@manuelvicnt

4. What is it?
Part of the Software Development Process
Requirements – Design – Construction – Testing – Deployment
Provides information about the quality of the
product or service under test
Test techniques include the process of executing
a program or application with the intent of finding
software bugs (errors or other defects)

5. Why bother? (as an Indie developer)
Find problems early
Cost of fixing the problem increases
Documentation: Your unit tests should be a
documentation for others
Facilitates change: Have the certainty that you
don’t break anything
Grow resiliently

6. Why bother? (as part of a company)
Your code meets the
requirements that
guided its design and
development
Achieves the general
result its
stakeholders desire
Regression
Testing
Automation
Testing

7. Why bother? (as part of a company)
Performs its
functions within an
acceptable time
Responds correctly
to all kinds of inputs
Performance
Testing
Unit Testing

8. Other Testing types
Alpha/Beta testing
Multi-variant testing
Accessibility testing
Security testing
Destructive testing
…

10. What is it?
Main Goal: Test classes in isolation
Individual units of source code are tested
Data validation
Interactions with other objects
Each test case is independent from the others

11. Example

12. How to write good UT
Answer these questions
What are you testing?

13. How to write good UT
Answer these questions
What are you testing?
What should it do?

14. How to write good UT
Answer these questions
What are you testing?
What should it do?
What is the actual output?
How can you get the output?

15. How to write good UT
Answer these questions
What are you testing?
What should it do?
What is the actual output?
How can you get the output?
Is that output expected?

16. How to write good UT
Write the tests before coding following the
requirements
Always follow the same approach
Arrange / Act / Assert
Given / When / Then

20. Fizz Buzz
Interview question designed to help filter out the
99.5% of programming job candidates
Take turns to count incrementally, replacing any
number divisible by 3 with the word “fizz”, and
any number divisible by five with the word “buzz”
Example: 1, 2, Fizz, 4, Buzz, Fizz, 7, 8, Fizz, Buzz,
11, Fizz, 13, 14, FizzBuzz, …

21. Rock Paper Scissors Lizard Spock

22. Check out the repo: https://github.com/jgarciabt/FizzBuzz

23. Code structure
Game Controller
FizzBuzz
Helper
RPSLS
Helper
- getFizzBuzz() - whoWins()
- getFizzBuzz()
- whoWins()

25. Mocking
Mock external dependencies
It creates fake objects which allows you to:
Verify that a method has been called on that object
Return a specific result when you call the method
on a fake object
Throw an exception when you call the method on a
fake object

27. What to Unit test in Mobile
Value testing your Business Logic
Everything but
Views
Basic getters and setters
Interactions with the platform specific classes /
frameworks (JVM, Android or iOS classes)

28. Unit Testing on Android
JUnit
Unit testing framework for Java. It runs on the
JVM, no need to have Android devices connected
InstrumentationTestCase
Class provided by the Android SDK which allows
us to access the Android instrumentation (e.g.
Context)

29. Test Driven Development (TDD)
Write the test before the implementation
The test will fail
Implement the solution to make the test pass
(usually with the minimum amount of effort)
The test will pass
Refactor the code to acceptable standards
Do it again

32. UT/TDD in Practice
Avoid unreliable Tests
People with experience on TDD and confidence
on the quality of their code usually write the
code first and then they cover it with Unit Tests

33. All advantages?
Takes a lot of time and dedication
Mocking frameworks don’t always work as you
expect and some of them have restrictions
Extra methods in your classes to allow testing
All the methods to be tested public? :(

35. What is it?
Use of external software to control the execution
of tests
Play back predefined actions on the product /
service
Compare the results to the expected behaviour
Important for Continuous Integration (CI)

36. Why bother?
Regression testing can be laborious and time
consuming
Time == $;
Automation vs Manual testing

37. In Mobile dev
Test Views & check what is on the screen is
correct
Test App behaviour
Automate manual testing

38. Cross platform Testing
Calabash is a software for Automated testing for
mobile apps
Enables you to write and execute tests defined
using natural language that can be understood
by business experts and non-technical staff

39. Calabash
Check out the repo with our example:
https://github.com/jgarciabt/FizzBuzz_automation

41. @jgarciabt
@manuelvicnt