Cassie Shum & Rebecca Eakins - Evolving Mobile Applications with Continuous Delivery

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@ c a s s i e n d @ o h r e b e c c a g o EVOLVING MOBILE APPLICATIONS WITH CONTINUOUS DELIVERY Cassie Shum & Rebecca Eakins

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An evolutionary architecture supports incremental, guided change as a ﬁrst principle along multiple dimensions. — Neal Ford “Evolutionary Architecture” EVOLUTION

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Continuous Deployment Continuous Delivery can deploy to production do deploy to production 㱺

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•User feedback •Believable •Reduced deployment risk

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2 month’s work Many LOC Risk 1 day’s work Few LOC Risk •User feedback •Believable •Reduced deployment risk

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scope time target done •User feedback •Believable •Reduced deployment risk

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Customer developent Agile product development Eric Ries, “The Lean Startup” http://bit.ly/8ZoX5F •User feedback •Believable •Reduced deployment risk

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Release Build Deploy Test

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Continuous Deployment Continuous Delivery can deploy to production do deploy to production 㱺

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Test Testing pyramid Continuous Integration Testing on real devices

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How many tests? TESTING STACK manual

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$$$$ ¢ manual

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PUSHING DOWN THE PYRAMID! manual

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CONTINUOUS INTEGRATION

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JEZ HUMBLE’S 3-STEP TEST 1. Every developer commits to master / trunk every day 2. Every commit triggers build and test 3. Failures usually ﬁxed in minutes

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JEZ HUMBLE’S 3-STEP TEST 1. Every developer commits to master / trunk every day 2. Every commit triggers build and test 3. Failures usually ﬁxed in minutes

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CONTINUOUS DELIVERY TOOL

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FASTLANE

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IT’S GETTING BETTER? https://medium.com/xcblog/xcode9-xcode-server-comprehensive-ios-continuous-integration-3613a7973b48

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http://square.github.io/spoon/static/device_cluster.png IT’S GETTING BETTER?

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Release Build Deploy Test

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@cassiend @ohrebeccago THANK YOU

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Books: • Continuous Delivery - Jez Humble, Dave Farley • Working Effectively with Legacy Code - Michael Feathers • Release It - Michael Nygard • Domain Driven Design - Eric Evans Articles/Blogs: • Branch by Abstraction - Jez Humble: http://continuousdelivery.com/2011/05/make-large-scale-changes-incrementally-with-branch-by- abstraction/ • Branch by Abstraction - Paul Hammant: http://paulhammant.com/blog/branch_by_abstraction.html/ • Feature Toggles - Martin Fowler: http://martinfowler.com/bliki/FeatureToggle.html • Conway’s Law: http://www.melconway.com/Home/Conways_Law.html Tools: • Appium: http://appium.io/ • Kiwi: https://github.com/kiwi-bdd/Kiwi • Calabash: http://calaba.sh/ • Robolectric: http://robolectric.org/ • New Relic: https://newrelic.com/mobile-monitoring • Fastlane: https://fastlane.tools/ • Spoon: http://square.github.io/spoon/ REFERENCES