Testable Android Architecture

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Testable Android Architecture 29 Sept 2016 / Chuck Greb

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Clean code Software Craftsmanship

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Art is anything you can do well. Anything you can do with Quality. “ ” - Robert M. Pirsig

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Clean Architecture MVC <> MVP <> MVVM

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In the beginning

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Activity

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Activity Activity Lifecycle System Services

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Activity EditText Button Activity Lifecycle System Services

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Activity EditText Button Web Service Storage AsyncTask Activity Lifecycle System Services

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Fragment Activity EditText Button Web Service Storage AsyncTask Activity Lifecycle System Services Fragment Fragment Lifecycle

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Fragment Activity EditText Button Web Service Storage AsyncTask Activity Lifecycle System Services Fragment Fragment Lifecycle User Input Input Validation

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Fragment Activity Web Service Storage AsyncTask Activity Lifecycle System Services Fragment Fragment Lifecycle User Input setRetainInstance(true) EditText Button Input Validation

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Fragment Activity Web Service Storage AsyncTask Activity Lifecycle System Services Fragment Fragment Lifecycle User Input setRetainInstance(true) Intent Parcelable Extras EditText Button Input Validation

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Web Service Storage Activity Fragment Fragment AsyncTask setRetainInstance(true) Activity Lifecycle Fragment Lifecycle System Services User Input Intent ActivityInstrumentati onTestCase2 Parcelable Extras EditText Button Input Validation

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There has to be a better way

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Activity Logic

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Activity Logic Data

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Activity Logic Data View

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View (Activity) Controller (Logic) Model (Data) View

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View (Activity) Presenter (Logic) Model (Data) View

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View (Activity) ViewModel (Logic) Model (Data) View

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Controller (Activity) Subcontroller (Logic) Model (Data) View

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- Phil Karlton There are two hard things in computer science: cache invalidation, naming things, [and errors off by one.] “ ”

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Clean Architecture Model View Presenter Controller MVP(C)

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Controller (Activity) Presenter (Logic) Model (Data) View

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Activity Presenter (Logic) Model (Data) View Controller

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Web Service Storage Activity Activity Lifecycle System Services User Input Presenter View Model Controller Button EditText Thread Input Validation

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Web Service Storage Activity Activity Lifecycle System Services User Input Presenter View Model Controller Thread Button EditText Input Validation

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Mock Service Mock Storage Test Controller Presenter Model Controller Thread JUnit TestRunner

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A test is not a unit test if: → It talks to the database → It communicates across the network → It touches the file system → It can't run at the same time as any of your other unit tests → You have to do special things to your environment (such as editing config files) to run it. Michael Feathers, 2005 A Set of Unit Test Rules

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