Test to Break Principles

There are two types of tests a developer can write, ‘test to work’ and ‘test to break’. Both are essential to robust development, but many developers only use the former and not the latter. This talk explains why ‘test to break’ principles are essential to ensure robust application development.

Transcript

1. W: rbrt.wllr.info | T: @RobDWaller Test to Break Principles Why You Should Crash Your Car Into a Tree
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4. W: rbrt.wllr.info | T: @RobDWaller What is a Unit Test?
5. W: rbrt.wllr.info | T: @RobDWaller 3 Types of Test
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7. W: rbrt.wllr.info | T: @RobDWaller TDD Tips Test Business Logic Test Private Methods Test Input / Output Test Big Methods Do Don’t
8. W: rbrt.wllr.info | T: @RobDWaller Test to Work
9. W: rbrt.wllr.info | T: @RobDWaller Example 1. Given the driver has a valid car key. When they insert the key into the ignition. And they turn the key. Then the car's engine starts.
10. W: rbrt.wllr.info | T: @RobDWaller Example 2. Given the driver has an invalid car key. When they insert the key into the ignition. And they turn the key. Then the car's engine will not start.
11. W: rbrt.wllr.info | T: @RobDWaller Test to Break
12. W: rbrt.wllr.info | T: @RobDWaller Example 1. Given the driver has a screwdriver. When they insert it into the ignition. And turn the screwdriver. Then the car's engine will not start.
13. W: rbrt.wllr.info | T: @RobDWaller Example 2. Given a car is traveling at 30 mph. When it hits a tree. Then all the seat belts tighten. And the airbags deploy.
14. W: rbrt.wllr.info | T: @RobDWaller Code Example
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21. W: rbrt.wllr.info | T: @RobDWaller Good software functions well and is bug free.
22. W: rbrt.wllr.info | T: @RobDWaller Ignorance Complexity
23. W: rbrt.wllr.info | T: @RobDWaller Ignorance is natural Complexity is standard Test to break helps
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25. W: rbrt.wllr.info | T: @RobDWaller Rules 1. Cars can only be black. 2. Cars can have two or four doors. 3. Cars must have four wheels.
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28. W: rbrt.wllr.info | T: @RobDWaller Summary ‘Working’ software is not good enough. Writing good software is hard. You are ignorant. Your problems are complicated. Always write tests. Stress and break your business logic. Code will work in one way always.
29. W: rbrt.wllr.info | T: @RobDWaller
30. W: rbrt.wllr.info | T: @RobDWaller Rob Waller T: @RobDWaller W: rbrt.wllr.info