UNIT TESTING is a level of software testing where individual units/ components of a software are tested. The purpose is to validate that each unit of the software performs as designed. A unit is the smallest testable part of any software. It usually has one or a few inputs and usually a single output. What's a unit test, how to write a good unit test, tools for testing.

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Unit Test
Danna Wang

2. 2
Problems when you add a logic or
finish a function

3. 3
PROBLEMS

4. Why
Unit Test
● Satisfy with requirement，verification function
implementation
● Protecting business value
● Confidence in making change
● Protect existing functions from being broken
● Communication to next developer
● Quickly know if the software is broken
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5. “I need someone who
has a different perspective to show me what I’ve missed.”
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Still need QA(Quality Assurance)

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Agile Testing
手动测试
黑盒测试
集成测试
冒烟测试
…...

7. Types of testing
7

8. TYPES
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● Integration test
● Automated test
● Regression test
● Manual test
● Smoke test
● UI test
● E2E test
● Contract test
● UAT(User Acceptance Test)

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Test
pyramid
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测试金字塔
一个健康、快速、可维护的测试组合
独立

10. What’s a good unit test
10

11. “A unit test is an automated piece
of code that invokes a unit of work
in the system and then checks a
single assumption about the
behavior of that unit of work.
- Roy Osherove (Art of unit testing)”
Unit Test 是指对软件中的最小可测试单元进行检查和验证。
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12. What’s a Unit
12
DIRECT AGENT/
FLEET ENGAGEMENT
SPEED OF
DELIVERY
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● 一个 Function？
● 一个 Class？
● 一个最小的业务单元？
“ 一千个人心中有一千种单元测试 ”

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DIRECT AGENT/
FLEET ENGAGEMENT
SPEED OF
DELIVERY
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14. Principle
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SUPPLY
AUTOMATION
DIRECT AGENT/
FLEET ENGAGEMENT
SPEED OF
DELIVERY

15. What’s a good Unit test
15
SUPPLY
AUTOMATION
DIRECT AGENT/
FLEET ENGAGEMENT
SPEED OF
DELIVERY
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● 避免进行真实的数据库操作、文件系统操作
● 独立地测试代码库的每一小块
● 正确重演业务，Do & Not do
● 包括正常 Case 和边缘 Case
● 测 “1+1=2” 这种没营养的单元吗? 100%？

16. How to write a good Unit test
16
SUPPLY
AUTOMATION
SPEED OF
DELIVERY
● Arrange
● Act
● Assert
● Given
● When
● Then

17. Basic test skeleton
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18. Unit test example
18
DIRECT AGENT/
FLEET ENGAGEMENT
SPEED OF
DELIVERY
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19. Tools for testing
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20. Tools for Testing
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● Jasmine
● Mocha
● JUnit
● Selenium
● REST-assured

21. Examples
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22. Example No.1
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23. Example No.2
User need a tool, so they can calculate the max number in any array.
Scenario User start to type a array
Given a array with 5 different number
When user use this tool
Then user should get the max number
Given a empty array
When user use this tool
Then user should be informed they input a empty array
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24. Practice time
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请补全 Average 函数的测试

25. 25
Happy testing

26. Thank you
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