Can You Hear Me Now? Tackling Telephony Testing
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The document discusses testing for telephony applications. It notes that telephony apps are long-running with both constrained and unconstrained inputs, as well as external call interactions happening concurrently. Testing approaches include integration testing using tools like sipp and Cucumber-VoIP, functional testing of single classes, and unit testing of methods with various input types. It recommends designing for concurrency, using state machines, and mocking dependencies for testing concurrency.
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Can You Hear Me Now? Tackling Telephony Testing
- 1. Can You Hear Me Now? Tackling Testing Telephony Ben Klang bklang@mojolingo.com Friday, August 10, 12
- 2. How Telephony Testing Is Different Friday, August 10, 12
- 3. How Telephony Testing Is Different • Apps are long-running code Friday, August 10, 12
- 4. How Telephony Testing Is Different • Apps are long-running code • Inputs may be more constrained (DTMF) Friday, August 10, 12
- 5. How Telephony Testing Is Different • Apps are long-running code • Inputs may be more constrained (DTMF) • Or they may be less constrained (IM, Voice) Friday, August 10, 12
- 6. How Telephony Testing Is Different • Apps are long-running code • Inputs may be more constrained (DTMF) • Or they may be less constrained (IM, Voice) • Lots of things are happening concurrently Friday, August 10, 12
- 7. How Telephony Testing Is Different • Apps are long-running code • Inputs may be more constrained (DTMF) • Or they may be less constrained (IM, Voice) • Lots of things are happening concurrently • External call interactions (conf, barge) Friday, August 10, 12
- 8. How Telephony Testing Is Different • Apps are long-running code • Inputs may be more constrained (DTMF) • Or they may be less constrained (IM, Voice) • Lots of things are happening concurrently • External call interactions (conf, barge) • XMPP Events Friday, August 10, 12
- 9. How Telephony Testing Is Familiar Friday, August 10, 12
- 10. How Telephony Testing Is Familiar • Same Tooling: rspec, mocha, cucumber, factory_girl, guard, rcov, rake Friday, August 10, 12
- 11. How Telephony Testing Is Familiar • Same Tooling: rspec, mocha, cucumber, factory_girl, guard, rcov, rake • Still draw lines between M, V and C Friday, August 10, 12
- 12. How Telephony Testing Is Familiar • Same Tooling: rspec, mocha, cucumber, factory_girl, guard, rcov, rake • Still draw lines between M, V and C • Good class design is important Friday, August 10, 12
- 13. How Telephony Testing Is Familiar • Same Tooling: rspec, mocha, cucumber, factory_girl, guard, rcov, rake • Still draw lines between M, V and C • Good class design is important Friday, August 10, 12
- 14. How Telephony Testing Is Familiar • Same Tooling: rspec, mocha, cucumber, factory_girl, guard, rcov, rake • Still draw lines between M, V and C • Good class design is important • It’s Just Ruby Friday, August 10, 12
- 15. Philosophy: SRP Friday, August 10, 12
- 16. Philosophy: SRP • Single Responsibility Principle Friday, August 10, 12
- 17. Philosophy: SRP • Single Responsibility Principle • If you need to use “and” to describe the purpose of a class, you are probably breaking this rule Friday, August 10, 12
- 18. Philosophy: SRP • Single Responsibility Principle • If you need to use “and” to describe the purpose of a class, you are probably breaking this rule • SRP is key to making classes testable Friday, August 10, 12
- 19. SRP Example Friday, August 10, 12
- 20. SRP Example • Class purpose: “To schedule calls and to place them” Friday, August 10, 12
- 21. SRP Example • Class purpose: “To schedule calls and to place them” • Testing requires mocking methods within the same class Friday, August 10, 12
- 22. SRP Example • Class purpose: “To schedule calls and to place them” • Testing requires mocking methods within the same class • Non-trivial work to swap calling mechanism Friday, August 10, 12
- 23. Philosophy: Tell, Don’t Ask Friday, August 10, 12
- 24. Philosophy: Tell, Don’t Ask • Tell an object to do its work Friday, August 10, 12
- 25. Philosophy: Tell, Don’t Ask • Tell an object to do its work • Don’t ask for its state then ask it to do something Friday, August 10, 12
- 26. Philosophy: Tell, Don’t Ask • Tell an object to do its work • Don’t ask for its state then ask it to do something • Works Hand-in-Hand with SRP Friday, August 10, 12
- 27. Philosophy: Tell, Don’t Ask • Tell an object to do its work • Don’t ask for its state then ask it to do something • Works Hand-in-Hand with SRP Friday, August 10, 12
- 28. Philosophy: Tell, Don’t Ask • Tell an object to do its work • Don’t ask for its state then ask it to do something • Works Hand-in-Hand with SRP Friday, August 10, 12
- 29. Philosophy: Prefer/Share Immutable Friday, August 10, 12
- 30. Philosophy: Prefer/Share Immutable • Methods should only use passed-in data Friday, August 10, 12
- 31. Philosophy: Prefer/Share Immutable • Methods should only use passed-in data • Avoid instance vars or other shared state Friday, August 10, 12
- 32. Philosophy: Prefer/Share Immutable • Methods should only use passed-in data • Avoid instance vars or other shared state • Especially helpful with concurrent code Friday, August 10, 12
- 33. Philosophy: Prefer/Share Immutable • Methods should only use passed-in data • Avoid instance vars or other shared state • Especially helpful with concurrent code • ... but makes testing in general easier Friday, August 10, 12
- 34. Prefer/Share Immutable Example Friday, August 10, 12
- 35. Prefer/Share Immutable Example Friday, August 10, 12
- 36. Prefer/Share Immutable Example Friday, August 10, 12
- 37. Prefer/Share Immutable Example Friday, August 10, 12
- 38. Levels of Testing Friday, August 10, 12
- 39. Levels of Testing Integration Friday, August 10, 12
- 40. Levels of Testing Integration Functional Friday, August 10, 12
- 41. Levels of Testing Integration Functional Unit Friday, August 10, 12
- 42. Levels of Testing Friday, August 10, 12
- 43. Levels of Testing • Integration Testing Friday, August 10, 12
- 44. Levels of Testing • Integration Testing • End-to-End Friday, August 10, 12
- 45. Levels of Testing • Integration Testing • End-to-End • Provide predefined inputs Friday, August 10, 12
- 46. Levels of Testing • Integration Testing • End-to-End • Provide predefined inputs • Verify outputs Friday, August 10, 12
- 47. Levels of Testing • Integration Testing • End-to-End • Provide predefined inputs • Verify outputs • Mock as little as possible Friday, August 10, 12
- 48. Integration Testing Tools for Telephony Friday, August 10, 12
- 49. Integration Testing Tools for Telephony • sipp: sipp.sourceforge.net Friday, August 10, 12
- 50. Integration Testing Tools for Telephony • sipp: sipp.sourceforge.net • Loadbot: github.com/mojolingo/ahn-loadbot Friday, August 10, 12
- 51. Integration Testing Tools for Telephony • sipp: sipp.sourceforge.net • Loadbot: github.com/mojolingo/ahn-loadbot • Cucumber-VoIP: github.com/benlangfeld/cucumber-voip Friday, August 10, 12
- 52. Functional Testing Friday, August 10, 12
- 53. Functional Testing • Test just one unit in isolation Friday, August 10, 12
- 54. Functional Testing • Test just one unit in isolation • Typical unit is a single class Friday, August 10, 12
- 55. Functional Testing • Test just one unit in isolation • Typical unit is a single class • Test function of class but do not make assertions about internal state Friday, August 10, 12
- 56. Unit Testing Friday, August 10, 12
- 57. Unit Testing • Most common form of testing Friday, August 10, 12
- 58. Unit Testing • Most common form of testing • Test that a given unit (typically: method) behaves the way you expect Friday, August 10, 12
- 59. Unit Testing • Most common form of testing • Test that a given unit (typically: method) behaves the way you expect • Make sure to test: Friday, August 10, 12
- 60. Unit Testing • Most common form of testing • Test that a given unit (typically: method) behaves the way you expect • Make sure to test: • Valid inputs Friday, August 10, 12
- 61. Unit Testing • Most common form of testing • Test that a given unit (typically: method) behaves the way you expect • Make sure to test: • Valid inputs • Invalid inputs Friday, August 10, 12
- 62. Unit Testing • Most common form of testing • Test that a given unit (typically: method) behaves the way you expect • Make sure to test: • Valid inputs • Invalid inputs • Error Conditions Friday, August 10, 12
- 63. Unit Testing Example Friday, August 10, 12
- 64. Unit Testing Example Friday, August 10, 12
- 65. Testing Concurrency Friday, August 10, 12
- 66. Testing Concurrency • Design with a concurrency model or library Friday, August 10, 12
- 67. Testing Concurrency • Design with a concurrency model or library • Celluloid, EventMachine Friday, August 10, 12
- 68. Testing Concurrency • Design with a concurrency model or library • Celluloid, EventMachine • Use State Machines to guarantee sequence Friday, August 10, 12
- 69. Testing Concurrency • Design with a concurrency model or library • Celluloid, EventMachine • Use State Machines to guarantee sequence • Mock non-blocking dependent operations with blocking mocks Friday, August 10, 12
- 70. Testing Concurrency • Design with a concurrency model or library • Celluloid, EventMachine • Use State Machines to guarantee sequence • Mock non-blocking dependent operations with blocking mocks • Always provide a timeout Friday, August 10, 12
- 71. Testing Concurrency https://github.com/benlangfeld/countdownlatch Friday, August 10, 12
- 72. Testing Concurrency https://github.com/benlangfeld/countdownlatch Friday, August 10, 12
- 74. Can You Hear Me Now? Tackling Testing Telephony Ben Klang bklang@mojolingo.com spkr8.com/t/12971 @bklang Github/Twitter Thanks to Ben Langfeld for his assistance with this presentation @benlangfeld Friday, August 10, 12