Can You Hear Me Now? Tackling Telephony Testing

Can You Hear Me Now?

Tackling Testing TelephonyBen Klang

bklang@mojolingo.com

Friday, August 10, 12

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

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

Philosophy: SRP

•Single Responsibility Principle

Philosophy: SRP

• If you need to use “and” to describe the purpose of a class, you are probably breaking this rule

Philosophy: SRP

• 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

SRP Example

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

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

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

Prefer/Share Immutable Example

Levels of Testing

Integration

Levels of Testing

Integration

Functional

Levels of Testing

Integration

Functional

Levels of Testing

• Integration Testing

Levels of Testing

•End-to-End

Levels of Testing

•End-to-End

•Provide predefined inputs

Levels of Testing

•End-to-End

•Verify outputs

Levels of Testing

•End-to-End

•Verify outputs

•Mock as little as possible

Integration Testing Tools for Telephony

Integration Testing Tools for Telephony• sipp:sipp.sourceforge.net

• Loadbot:github.com/mojolingo/ahn-loadbot

• Cucumber-VoIP:github.com/benlangfeld/cucumber-voip

Functional Testing

•Test just one unit in isolation

Functional Testing

•Typical unit is a single class

Functional Testing

•Typical unit is a single class

•Test function of classbut do not makeassertions about internal state

Unit Testing

•Most common form of testing

Unit Testing

•Test that a given unit (typically: method) behaves the way you expect

Unit Testing

•Make sure to test:

Unit Testing

•Make sure to test:•Valid inputs

Unit Testing

•Make sure to test:•Valid inputs• Invalid inputs

Unit Testing

•Make sure to test:•Valid inputs• Invalid inputs•Error Conditions

Unit Testing Example

Testing Concurrency

•Design with a concurrency model or library

Testing Concurrency

•Celluloid, EventMachine

Testing Concurrency

•Use State Machines to guarantee sequence

Testing Concurrency

•Mock non-blocking dependent operations with blocking mocks

Testing Concurrency

•Mock non-blocking dependent operations with blocking mocks

•Always provide a timeout

Testing Concurrency

https://github.com/benlangfeld/countdownlatch

Testing Concurrency

https://github.com/benlangfeld/countdownlatch

http://adhearsion.com/conference/2012

Can You Hear Me Now?

Tackling Testing Telephony Ben Klangbklang@mojolingo.com@bklang Github/Twitterspkr8.com/t/12971

Thanks to Ben Langfeld for his assistance with this presentation@benlangfeld

Can You Hear Me Now? Tackling Telephony Testing

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