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Mobile App Continuous Delivery PRESENTED BY QC Li⎪ February 03, 2017

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About me QC Li Yahoo! Mobile App Engineer qcli @ yahoo-inc . com

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Outline ■ Continuous Delivery ■ Continuous Delivery Pipeline ■ Mobile App Continuous Delivery Pipeline

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Continuous Delivery

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CD https://commons.wikimedia.org/wiki/File:Compact_disc.svg

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Continuous Delivery Continuous Delivery (CD) is a software engineering approach in which teams keep producing valuable software in short cycles and ensure that the software can be reliably released at any time. “ — Wikipedia

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Continuous Delivery What we want is … ■ Low Cycle Time ● Cycle time: The time from deciding that you need to make a change to having it in production. ■ High Quality

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Continuous Delivery Automation almost everything

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Continuous Delivery Commit to Production without human intervention

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Continuous Delivery Pipeline

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Continuous Delivery Pipeline ■ Workflow of tasks ■ Automatically delivers code from commit to production Automation Commit Task A Task B Task C Production Candidate Release

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Automation Version Control Ready for release Continuous Delivery Pipeline ■ Keep everything in Version Control Commit A Task A Task B Task C Production Candidate A

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Automation Automation Version Control Ready for release Continuous Delivery Pipeline ■ Keep everything in Version Control Commit A Task A Task B Task C Commit B Task A Task B Task C Production Candidate B Production Candidate A

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Continuous Delivery Pipeline ■ Each change should propagate through the pipeline instantly Trigger Commit A Task A Task B Task C

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Continuous Delivery Pipeline ■ If any part of the pipeline fail, stop the line Trigger Commit A Task A Task B Task C Trigger Feedback

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Continuous Delivery Pipeline ■ If any part of the pipeline fail, stop the line Trigger Production Candidate Commit A Task A Task B Task C Trigger Trigger Trigger Trigger Trigger Commit B Commit C Trigger Trigger Feedback

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Continuous Delivery Pipeline ■ Let the state of pipeline visible Trigger Production Candidate Commit A Task A Task B Task C Trigger Trigger Trigger Trigger Trigger Commit B Commit C Trigger Trigger Feedback https://commons.wikimedia.org/wiki/File:Eye_iris.jpg

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Continuous Delivery Pipeline ■ Let the state of pipeline visible ● Dashboard https://commons.wikimedia.org/wiki/File:Eye_iris.jpg

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Continuous Delivery Pipeline ■ Let the state of pipeline visible ● Physically

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Continuous Delivery Pipeline ■ Let the state of pipeline visible ● Physically https://youtu.be/2ygPkb8KW70?t=2m55s

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Continuous Delivery Pipeline ■ Quick feedback ■ Everyone is responsible for the quality ■ Everyone is responsible for the delivery process

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Continuous Delivery Pipeline — Plasma Chen, 2014 Generated by 萌典字圖

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Continuous Delivery Pipeline ■ Automatically delivers code from commit to production ● Build production from code ● Testing Automation Commit Task A Task B Task C Production Candidate Release

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Continuous Delivery Pipeline ■ Automatically delivers code from commit to production ● Build production from code ● Testing Automation Commit Build Testing Production Candidate Release

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Mobile App Continuous Delivery Pipeline ■ Automatically delivers code from commit to production ● Commit Stage ● Automated Acceptance Testing Stage ● Automated Non-functional Testing Stage Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release

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Mobile App Continuous Delivery Pipeline ■ Commit Stage ● Build App ● Assert App works at technical level Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release

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Mobile App Continuous Delivery Pipeline ■ Automated Acceptance Testing Stage ● Assert App works at functional level Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release

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Mobile App Continuous Delivery Pipeline ■ Automated Non-functional Testing Stage ● Assert App works at non-functional level Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release

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Pre Commit

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Pre Commit ■ Developing, make changes ■ Build locally ■ Test locally (e.g. Unit test) ■ Commit after it can be built successfully and passing test Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release

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Pull Request ■ After commit change locally, create a pull request Commit Commit

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Code Review ■ Changes need be reviewed by other developers ■ DO NOT merge it without code review

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Code Review ■ Changes need be reviewed by other developers ■ DO NOT merge it without code review

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Merge ■ Merge after it can be built successfully and passing test

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Merge ■ Merge after it can be built successfully and passing test

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Commit Stage

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Commit Stage ■ Assert App works at technical level ■ Build ■ Unit test Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release

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Build ■ Compile source code to build App Source Code Source Code Source Code .apk .ipa

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Unit Test ■ Test a method with input, then check if the output is expected ■ Don’t repeat yourself ■ Arrange-Act-Assert pattern

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Unit Test

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Analysis ■ Check its health ● Test coverage ● Duplicated code ● Number of warnings ● ...

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Automated Acceptance Testing Stage

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Automated Acceptance Testing Stage ■ Assert App delivers the value to user is expected ■ Smoke test ■ Functional test Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release

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Smoke Test ■ Check App can provide most important features ■ Test through UI automation ✔

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Functional Test ■ Check App provide main features we want to deliver ■ Test through UI automation ✔

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Automated Non-functional Testing Stage

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Automated Non-functional Testing Stage ■ Assert App works at non-functional level ■ Stability Test ■ Performance Test Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release

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Stability Test ■ Monkey test https://commons.wikimedia.org/wiki/File:Monkey-typing.jpg

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Stability Test ■ Monkey test

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Performance Test ■ Cold start time ■ Memory usage ■ FPS ■ ...

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Release

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Mobile App Continuous Delivery Pipeline ■ There is always a gap between ideal and reality Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release

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Mobile App Continuous Delivery Pipeline ■ There is always a gap between ideal and reality Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release Manual Testing

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Manual Testing ■ Something can not be tested automatically

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Release ■ Submit the production candidate to Google Play / App Store .apk .ipa

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After Release ■ If find an error in production... — 《論語》 Generated by 萌典字圖

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After Release ■ Add test cases to prevent it, 「不貳過」 — 《論語》 Generated by 萌典字圖

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Mobile App Continuous Delivery Pipeline ■ Low cycle time ■ High quality Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release Manual Testing

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Mobile App Continuous Delivery Pipeline Automation Commit Commit Stage Acceptance Testing Non-functional Testing Production Candidate Release Manual Testing Commit to Production (almost) without human intervention

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Q & A ._./