Test Driven Development en Go con Ginkgo y Gomega
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The document outlines the principles and practices of Test Driven Development (TDD) in Go, emphasizing the importance of writing tests before code to enhance understanding of design and ensure quality. It provides practical tips, tools like Ginkgo and Gomega for testing, and highlights the need for mocking external components. Additionally, the author, Eddy Reyes, discusses the benefits and challenges of TDD and offers specific code examples.
Test Driven Development en Go con Ginkgo y Gomega
- 1. TDD in Go with Ginkgo and Gomega Presenta: Eddy Reyes
- 2. Eddy Reyes Founder of Mindsight ● AI for Software Project Management ● Tells you when tasks will be finished by watching code changes.
- 3. Test Driven Development ● Write the test ● Watch it fail ● Implement new code ● Test passes I CAN HAZ DESIGN??
- 4. Anatomy of a Test ● GIVEN: X is true ● WHEN: Y happens ● THEN: Z must be true
- 5. TDD What’s it Good For? ● Helps you create unit tests ● Tests are enforceable design spec ● Forces deep understanding of design before coding
- 6. TDD, Ain't Nobody Got Time For That ● TDD takes up front additional effort ● Tests are hard- code that reasons about the behavior of code ● Design must be understood before test is written
- 7. TDD Pro Tips ● Divide and Conquer! Work with the smallest piece possible ● Experiment, prototype, learn your design ● Throw away your prototype! Start fresh with tests first
- 8. Go testing Package In a file named XX_test.go: func TestMyThing(t *testing.T) { result, err := DoMyThing() if err == nil { t.Error(“Failed with error:”, err) } if !result { t.Error(“Expected true”) } }
- 9. Go Testing Capabilities (Batteries Included) Run your tests: $ go test -race … Also tells you if a race condition is detected in your code Compute test coverage: $ go test -coverprofile=coverage.out $ go tool cover -html=coverage.out
- 10. Alternative Testing Tools Ginkgo / Gomega ● Jasmine clone for Go ● Ginkgo- BDD-style test specification ● Gomega- Assertion syntax Convey ● https://github.com/smartystreets/goconvey
- 11. Example With Ginkgo / Gomega
- 12. Ginkgo Contexts
- 13. Tests with Channels + Concurrency
- 14. Mocking net/http/httptest ● Create mock HTTP servers or clients ● Mock out HTTP interactions (simulate server responses, client responses)
- 15. Mocking What about when you have a non-HTTP external component? Use Interfaces!! Here we never use the mongo library directly in code:
- 16. Mocking To test code interacting with the DB: ● Create mock implementation of DBConnection ● Pass the mock into your code from the test