Testing your Swift Code

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Testing your Swift Code M AT T N E D R I C H

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ABOUT ME AT O M I C O B J E C T M AT T N E D R I C H @ M AT T N E D R I C H M AT T. N E D R I C H @ AT O M I C O B J E C T. C O M

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GOAL Introduce basic testing approaches in Swift Unit Tests UI Tests Discuss some useful libraries Continuous Integration & Automatic Deployment

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Changing Landscape [Objective C]

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What’s the deal with Swift? ¯\_(ϑ)_/¯

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WHATS THE DEAL WITH SWIFT Limited reﬂection support Required by most mocking approaches Different runtime rules Can still write lots of great tests though

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XCTest

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https://github.com/mattnedrich/codemash-testing-demo

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XCTEST EXAMPLE

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XCTEST ASSERTIONS XCTAssertEqual(expression1, expression2, format…) XCTAssertNil(expression, format…) XCTAssertNotNil(expression, format...) XCTAssertTrue(expression, format…) XCTAssertThrows(expression, format…) XCTAssertNoThrow(expression, format...)

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XCTEST SYNCHRONOUS EXAMPLE

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XCTEST SYNCHRONOUS EXAMPLE

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XCTEST ASYNCHRONOUS EXAMPLE

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XCTEST ASYNCHRONOUS EXAMPLE

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UIViewController

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UIVIEWCONTROLLER Test outlets Test some simple UI behavior

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UIVIEWCONTROLLER

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UITABLECONTROLLER

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XCTEST SUMMARY Bare Bones, lots of boilerplate Poor test readability Can ﬁnd ways to test most scenarios

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Testing Libraries

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QUICK AND NIMBLE

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QUICK AND NIMBLE

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QUICK AND NIMBLE

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QUICK AND NIMBLE XCTEST

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PREVIOUS ASYNC EXAMPLE

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QUICK AND NIMBLE - ASYNC

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Mocking

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H T T P : / / B L O G . P R A G M AT I C E N G I N E E R . C O M / S W I F T - T H E - O N LY - M O D E R N - L A N G U A G E - W I T H - N O - M O C K I N G - F R A M E W O R K /

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SWIFT TEST MOCKING Traditional mocking support does not exist Can create sub classes and override functions Must loosely couple things and rely on protocols for everything This can be great It can also lead to a large amount of unnecessary abstraction

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MOCKING LIBRARIES Some libraries do exist Usually create types ahead of time in batch Anyone have experience with them?

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UI Testing

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UI TESTING Allow tests to perform UI interactions and assert behavior Similar to KIF tests Can work nicely as end-to-end or integration tests

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UI TESTING

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UI TESTING

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UI TESTING

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UI TESTING - PASS DATA TO TEST Use the launch arguments

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UI Testing - Recording

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Continuous Integration

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LOTS OF CI OPTIONS Circle CI Travis CI TeamCity …

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Circle CI

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STEP 1: PUT YOUR PROJECT ON GITHUB

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STEP 2: SHARE YOUR XCODE SCHEME

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STEP 3: PUSH TO GITHUB, LOG INTO CIRCLE CI

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STEP 4: SELECT YOUR PROJECT AND REPOSITORY

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STEP 5: CIRCLE CI WILL BUILD YOUR PROJECT

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STEP 5: FAILED BUILD

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STEP 6: ADD CIRCLE.YML CONFIGURATION FILE

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STEP 7: RE-RUN WITH XCODE 8.2

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CIRCLE CI IS NOW WORKING Your project will be built and tests will be run every time someone pushes to master Everyone subscribed to the Github repository will receive email notiﬁcations

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What About Deployment?

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GOAL Every time a change is pushed to master Build project Run tests If tests pass, push build to TestFlight or HockeyApp, etc. Release build to test users with the press of a button

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STEP 1: INSTALL FASTLANE

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STEP 1: INSTALL FASTLANE

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STEP 2: CREATE CERTIFICATES

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STEP 2: CREATE CERTIFICATES fastlane cert --output_path certificates This will create three ﬁles something.cer something.certSigningRequest something.p12

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STEP 2: CREATE CERTIFICATES

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STEP 3: CREATE PROVISIONING PROFILE

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STEP 3: CREATE PROVISIONING PROFILE fastlane sigh This will create something like AppStore_com.mattnedrich.codemash-testing-demo.mobileprovision