The document provides information about the Go programming language, including that it was created due to frustration with existing languages for systems programming and was open-sourced by Google in 2009. It is statically typed but sometimes allows type inference, focuses on readability and performance, and has garbage collection and native concurrency support using coroutines and channels. The document also discusses smoke testing in Go using the Ginkgo testing framework and describes how to connect to a web driver and interact with page elements when testing web applications using the Agouti library.

1. WITH GO
SMOKE TESTING

2. GO

3. GO WAS CONCEIVED WHILE
WAITING FOR C++ TO
COMPILE
it is said that

4. “BORN OUT OF FRUSTRATION WITH
EXISTING LANGUAGES AND
ENVIRONMENTS FOR SYSTEMS
PROGRAMMING”
2007

5. OPEN-SOURCED BY GOOGLE
2009

6. COMPILED

7. STATICALLY-TYPED
SOMETIMES THE TYPE IS INFERRED FROM THE CONTEXT

8. FOCUS ON READABILITY
AND PERFORMANCE
DESIGNED FOR GOOGLE-SCALE CODEBASES

9. GARBAGE-COLLECTED

10. NATIVE CONCURRENCY SUPPORT
COROUTINES, CHANNELS

11. SYNTAX ENFORCES READABILITY
NO TERNARY OPERATOR
VAR++ DOES NOT RETURN VALUE

12. SMART DEPENDENCY LINKING
FAST COMPILATION

13. WHAT DOES IT LOOK LIKE?

15. GAINING POPULARITY:

16. TESTING
FRAMEWORKS

19. GINGKO TEST STRUCTURE
▸ Describe()
▸ Context()
▸ It()
▸ By()
▸ Describe()
▸ …

20. THE USUAL
▸ BeforeSuite()
▸ BeforeEach()
▸ AfterEach()
▸ AfterSuite()

21. FOCUSED SPECS
▸ FDescribe()
▸ FContext()
▸ FIt()

22. RUNNING TEST SUITE
go test

24. MAKING ASSERTIONS
‣ Expect(ACTUAL).To(Equal(EXPECTED))
‣ Expect(ACTUAL).NotTo(Equal(EXPECTED))
‣ Expect(ACTUAL).ToNot(Equal(EXPECTED))

25. ASSERTING EQUIVALENCE
‣ Equal(...)
‣ BeEquivalentTo(...)
‣ BeAssignableToTypeOf(...)

26. ASSERTING PRESENCE
‣ BeNil()
‣ BeZero()

27. ASSERTING TRUTHINESS
‣ BeTrue()
‣ BeFalse()

28. ASSERTING ON ERRORS
‣ HaveOccurred()
‣ Succeed()
‣ MatchError(...)

29. MAKING ASYNCHRONOUS ASSERTIONS
▸ Eventually()
▸ Consistently()

30. EVENTUALLY
Eventually(func() []int {
return thing.SliceImMonitoring
}, TIMEOUT, POLLING_INTERVAL).Should(HaveLen(2))

31. CONSISTENTLY
Consistently(func() []int {
return thing.MemoryUsage()
}).Should(BeNumerically("<", 10))

34. PROCESS
‣ Connect to the web driver
‣ Create page object
‣ Find / select elements on the page to interact with
‣ Interact (click, fill in text, submit form, …)
‣ Make assertions about the expected result
‣ Destroy page object

35. CONNECTING TO THE WEB DRIVER
var err error
capabilities :=
agouti.NewCapabilities().Browser("firefox").Platform("linux").
With("javascriptEnabled")
page, err = agouti.NewPage("http://selenium:4444/wd/
hub", agouti.Desired(capabilities))
Expect(err).NotTo(HaveOccurred())
page.Size(1360, 768)

36. FINDING ELEMENTS
‣ page.First(“#project-toggle")
‣ page.FindByLabel(“Password")

37. MORE FINDERS
‣ FindByButton(text string) *Selection
‣ FindByLabel(text string) *Selection
‣ FindByLink(text string) *Selection
‣ FindByName(name string) *Selection
‣ FindByXPath(selector string) *Selection
‣ and many more…

38. THINGS TO DO WITH THE PAGE
‣ GetCookies() ([]*http.Cookie, error)
‣ Navigate(url string) error
‣ RunScript(body string, arguments map[string]interface{},
result interface{}) error
‣ Screenshot(filename string) error
‣ SetCookie(cookie *http.Cookie) error
‣ Size(width, height int) error
‣ and so on…

39. THINGS TO DO WITH THE SELECTION
‣ Check() error
‣ Click() error
‣ Fill(text string) error
‣ Submit() error
‣ UploadFile(filename string) error
‣ FlickFinger(xOffset, yOffset int, speed uint) error
‣ and so on…

40. OUR SETUP

41. DOCKER COMPOSE
SELENIUM
HEADLESS FIREFOX
GO RUNTIME
LIBRARIES
TEST SUITE
CAMATO

42. ENVIRONMENT VARIABLES
‣ ENV: {staging, review, integration, www}
‣ which server to test against
‣ SCREENSHOT: {yes, no}
‣ whether or not to record screenshots

43. IN DOCKER-COMPOSE.YML
kitten:
<<: *smoketests
command: go test -test.timeout 15m -ginkgo.progress -ginkgo.v -
ginkgo.focus Kitten
campaign_management:
<<: *smoketests
command: go test -test.timeout 15m -ginkgo.progress -ginkgo.v -
ginkgo.focus Campaign

44. FROM THE COMMAND LINE
docker-compose run -e ENV=staging -e SCREENSHOT=yes all
docker-compose run -e ENV=staging -e SCREENSHOT=yes kitten
docker-compose run -e ENV=staging -e SCREENSHOT=yes campaign_management

45. DEMO

46. THANKS!