7 Steps for writing your first test
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Breaking down the unit test writing process into tiny bits. What to think about, what to focus on, and how are tools affect what we do.
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7 Steps for writing your first test
- 1. @gil_zilberfeld SELA DEVELOPER PRACTICE May 5-9, 2013 Gil Zilberfeld 7 Steps for writing your first test
- 3. @gil_zilberfeld Step 0: Prepare • Know your tools • Evaluate the risk • Choose your partner
- 4. @gil_zilberfeld Step 1: What to test • What you’re working on • Bug or feature? • Logic • Read it first • What not to test: • Multithreading • Stored procedures • UI
- 5. @gil_zilberfeld Step 2: Get ready • Pick organization strategy • Create test projects • Remove fluff • VS I’m looking at you
- 6. @gil_zilberfeld Step 3: Pick a scenario • Scenario consists of • Context • Logic • Success criteria • Pick the simplest scenario • Say it! • Name it! • Assert it! http://erpstore.codeplex.com/
- 7. @gil_zilberfeld Step 4: Identify dependencies • Read the code • Constructor parameters • Fields • Statics • Global state • Mocking strategy • None • Where to mock • How to mock
- 8. @gil_zilberfeld Step 5: Simplify design • Refactor with tools: VS, R#, DevExpress • Close down regions you’re not going to cover • Rename fields • Extract methods • Manual refactoring works too • …but more risky
- 9. @gil_zilberfeld Step 6: Here we go! • Arrange • Run • Fail • Arrange more • Run • ….. • Success!
- 10. @gil_zilberfeld Step 7: Move on! • Pick the next scenario • Say it • Name it • Assert it • Mutate the test setup • Arrange • Run • … • Win!
- 11. @gil_zilberfeld Congratulations! • This is just the beginning • Lifetime improvement • Picking scenarios • Naming • Mocking • Refactoring
- 12. @gil_zilberfeld Would you like to know more? www.typemock.com typemock.com/blog @typemock www.gilzilberfeld.com gilz@typemock.com @gil_zilberfeld