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Dave Farley http://www.davefarley.net @davefarley77 http://www.continuous-delivery.co.uk Acceptance Testing for Continuous Delivery http://www.continuous-delivery.co.uk

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Page 1: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Dave Farley http://www.davefarley.net @davefarley77

http://www.continuous-delivery.co.uk

Acceptance Testing for Continuous Delivery

http://www.continuous-delivery.co.uk

Page 2: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

The Role of Acceptance Testing

Local Dev. Env.

Source Repository

Page 3: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

The Role of Acceptance Testing

Artifact Repository

Local Dev. Env.

Deployment PipelineCommit

Production Env.

Deployment App.

CommitAcceptance

Manual

Perf1Perf2

Staged

Production

Source Repository

Acceptance

Component Performance

System Performance

Staging Env.

Deployment App.

Manual Test Env.

Deployment App.

Page 4: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

The Role of Acceptance Testing

Artifact Repository

Local Dev. Env.

Deployment PipelineCommit

Production Env.

Deployment App.

CommitAcceptance

Manual

Perf1Perf2

Staged

Production

Source Repository

Acceptance

Component Performance

System Performance

Staging Env.

Deployment App.

Manual Test Env.

Deployment App.

Staging Env.

Deployment App.

Manual Test Env.

Deployment App.

Component Performance

System Performance

Acceptance

Page 5: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

The Role of Acceptance Testing

Artifact Repository

Local Dev. Env.

Deployment PipelineCommit

Production Env.

Deployment App.

CommitAcceptance

Manual

Perf1Perf2

Staged

Production

Source Repository

Acceptance

Component Performance

System Performance

Staging Env.

Deployment App.

Manual Test Env.

Deployment App.

Staging Env.

Deployment App.

Manual Test Env.

Deployment App.

Component Performance

System Performance

Acceptance

Page 6: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

What is Acceptance Testing?• Asserts that the code does what the users want.

• An automated “definition of done”

• Asserts that the code works in a “production-like” test environment.

• A test of the deployment and configuration of a whole system.

• Provides timely feedback on stories - closes a feedback loop.

• Acceptance Testing, ATDD, BDD, Specification by Example, Executable Specifications.

Page 7: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

What is Acceptance Testing?

A Good Acceptance Test is:

An Executable Specification of the Behaviour of the System

Page 8: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

What is Acceptance Testing?

Unit Test CodeIdea Executable spec. Build Release

Page 9: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

What is Acceptance Testing?

Unit Test CodeIdea Executable spec. Build Release

Page 10: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

What is Acceptance Testing?

Unit Test CodeIdea Executable spec. Build Release

Page 11: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

So What’s So Hard?• Tests break when the SUT changes (Particularly UI)

• Tests are complex to develop

• This is a problem of design, the tests are too tightly-coupled to the SUT!

• The history is littered with poor implementations:

• UI Record-and-playback Systems

• Record-and-playback of production data

• Dumps of production data to test systems

• Nasty automated testing products.

Page 12: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

So What’s So Hard?• Tests break when the SUT changes (Particularly UI)

• Tests are complex to develop

• This is a problem of design, the tests are too tightly-coupled to the SUT!

• The history is littered with poor implementations:

• UI Record-and-playback Systems

• Record-and-playback of production data

• Dumps of production data to test systems

• Nasty automated testing products.

Anti-Pattern!Anti-Pattern!Anti-Pattern!Anti-Pattern!

Page 13: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Who Owns the Tests?

• Anyone can write a test

• Developers are the people that will break tests

• Therefore Developers own the responsibility to keep them working

• Separate Testing/QA team owning automated tests

Page 14: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Who Owns the Tests?

• Anyone can write a test

• Developers are the people that will break tests

• Therefore Developers own the responsibility to keep them working

• Separate Testing/QA team owning automated tests Anti-Pattern!

Page 15: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Who Owns the Tests?

Developers Own Acceptance Tests!

Page 16: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

Page 17: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

Page 18: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Public API FIX APITrade

Reporting Gateway

“What” not “How”

API Traders Clearing Destination

Other external

end-pointsMarket Makers

UI Traders

Page 19: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Public API FIX APITrade

Reporting Gateway

“What” not “How”

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case Test

Case

Test Case

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Page 20: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Public API FIX APITrade

Reporting Gateway

…FIX API

“What” not “How”

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case Test

Case

Test Case

Test Case

Test Case

Test Case

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Test Case Test

Case

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Test Case

Test Case

Page 21: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Public API FIX APITrade

Reporting Gateway

“What” not “How”

API Traders Clearing Destination

Other external

end-pointsMarket Makers

UI Traders

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case Test

Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Page 22: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Public API FIX APITrade

Reporting Gateway

“What” not “How”

FIX API

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case Test

Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

API External StubsFIX-APIUI FIX-APIFIX-API

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case Test

Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Page 23: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Public API FIX APITrade

Reporting Gateway

“What” not “How”

FIX API

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case Test

Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

API External StubsFIX-APIUI FIX-API

Page 24: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Public API FIX APITrade

Reporting Gateway

“What” not “How”Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case Test

Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

Test Case

API External StubsFIX-APIUI FIX-API

Page 25: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Public API FIX APITrade

Reporting Gateway

“What” not “How”

API External StubsFIX-APIUI FIX-API

Test infrastructure common to all acceptance tests

Page 26: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

“What” not “How” - Separate Deployment from Testing

• Every Test should control its start conditions, and so should start and init the app.

• Acceptance Test deployment should be a rehearsal for Production Release

• This separation of concerns provides an opportunity for optimisation

• Parallel tests in a shared environment

• Lower test start-up overhead

Page 27: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

“What” not “How” - Separate Deployment from Testing

• Every Test should control its start conditions, and so should start and init the app.

• Acceptance Test deployment should be a rehearsal for Production Release

• This separation of concerns provides an opportunity for optimisation

• Parallel tests in a shared environment

• Lower test start-up overhead

Anti-Pattern!

Page 28: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

Page 29: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

Page 30: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation• Any form of testing is about evaluating

something in controlled circumstances

• Isolation works on multiple levels

• Isolating the System under test

• Isolating test cases from each other

• Isolating test cases from themselves (temporal isolation)

• Isolation is a vital part of your Test Strategy

Page 31: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Isolating the System Under Test

Page 32: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Isolating the System Under Test

External System ‘A’

External System ‘C’

System Under Test ‘B’

Page 33: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Isolating the System Under Test

External System ‘A’

External System ‘C’

System Under Test ‘B’

Page 34: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Isolating the System Under Test

External System ‘A’

External System ‘C’

System Under Test ‘B’

Page 35: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Isolating the System Under Test

External System ‘A’

External System ‘C’

System Under Test ‘B’?

Page 36: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Isolating the System Under Test

External System ‘A’

External System ‘C’

System Under Test ‘B’Anti-Pattern!

Page 37: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Isolating the System Under Test

System Under Test ‘B’Test Cases Verifiable

Output

Page 38: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Validating The Interfaces

Page 39: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Validating The Interfaces

External System ‘A’

External System ‘C’

System Under Test ‘B’

Page 40: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Validating The Interfaces

External System ‘A’

External System ‘C’

System Under Test ‘B’

Page 41: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Validating The Interfaces

External System ‘A’

External System ‘C’

Test Cases Verifiable Output

System Under Test ‘B’

Test Cases Verifiable Output

Test Cases Verifiable Output

Page 42: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Validating The Interfaces

External System ‘A’

External System ‘C’

Test Cases Verifiable Output

System Under Test ‘B’

Test Cases Verifiable Output

Test Cases Verifiable Output

Page 43: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Isolation - Isolating Test Cases• Assuming multi-user systems…

• Tests should be efficient - We want to run LOTS!

• What we really want is to deploy once, and run LOTS of tests

• So we must avoid ANY dependencies between tests…

• Use natural functional isolation e.g.

• If testing Amazon, create a new account and a new book/product for every test-case

• If testing eBay create a new account and a new auction for every test-case

• If testing GitHub, create a new account and a new repository for every test-case

• …

Page 44: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

• We want repeatable results

• If I run my test-case twice it should work both times

Test Isolation - Temporal Isolation

Page 45: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

• We want repeatable results

• If I run my test-case twice it should work both times

Test Isolation - Temporal Isolation

def test_should_place_an_order(self): self.store.createBook(“Continuous Delivery”);

order = self.store.placeOrder(book=“Continuous Delivery")

self.store.assertOrderPlaced(order)

Page 46: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

• We want repeatable results

• If I run my test-case twice it should work both times

Test Isolation - Temporal Isolation

def test_should_place_an_order(self): self.store.createBook(“Continuous Delivery”);

order = self.store.placeOrder(book=“Continuous Delivery")

self.store.assertOrderPlaced(order)

Page 47: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

• We want repeatable results

• If I run my test-case twice it should work both times

Test Isolation - Temporal Isolation

def test_should_place_an_order(self): self.store.createBook(“Continuous Delivery”);

order = self.store.placeOrder(book=“Continuous Delivery")

self.store.assertOrderPlaced(order)

Page 48: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

• We want repeatable results

• If I run my test-case twice it should work both times

Test Isolation - Temporal Isolation

def test_should_place_an_order(self): self.store.createBook(“Continuous Delivery”);

order = self.store.placeOrder(book=“Continuous Delivery")

self.store.assertOrderPlaced(order)

Continuous Delivery

Page 49: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

• We want repeatable results

• If I run my test-case twice it should work both times

Test Isolation - Temporal Isolation

def test_should_place_an_order(self): self.store.createBook(“Continuous Delivery”);

order = self.store.placeOrder(book=“Continuous Delivery")

self.store.assertOrderPlaced(order)

Continuous Delivery

Page 50: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

• We want repeatable results

• If I run my test-case twice it should work both times

Test Isolation - Temporal Isolation

def test_should_place_an_order(self): self.store.createBook(“Continuous Delivery”);

order = self.store.placeOrder(book=“Continuous Delivery")

self.store.assertOrderPlaced(order)

Continuous Delivery1234

Page 51: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

• We want repeatable results

• If I run my test-case twice it should work both times

Test Isolation - Temporal Isolation

def test_should_place_an_order(self): self.store.createBook(“Continuous Delivery”);

order = self.store.placeOrder(book=“Continuous Delivery")

self.store.assertOrderPlaced(order)

Continuous Delivery1234Continuous Delivery6789

Page 52: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

• We want repeatable results

• If I run my test-case twice it should work both times

Test Isolation - Temporal Isolation

def test_should_place_an_order(self): self.store.createBook(“Continuous Delivery”);

order = self.store.placeOrder(book=“Continuous Delivery")

self.store.assertOrderPlaced(order)

Continuous Delivery1234Continuous Delivery6789

• Alias your functional isolation entities

• In your test case create account ‘Dave’ in reality, in the test infrastructure, ask the application to create account ‘Dave2938472398472’ and alias it to ‘Dave’ in your test infrastructure.

Page 53: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

Page 54: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

Page 55: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Repeatability - Test Doubles

External System

Page 56: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Repeatability - Test Doubles

External System

Local Interface to External System

Page 57: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Repeatability - Test Doubles

External System

Local Interface to External System

Communications to External System

Page 58: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Repeatability - Test Doubles

External System

Local Interface to External System

Communications to External System

TestStub Simulating External

System

Local Interface to External System

Page 59: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Repeatability - Test Doubles

External System

Local Interface to External System

Communications to External System

TestStub Simulating External

System

Local Interface to External System

Production

Test Enviro

nment

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Page 60: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Doubles As Part of Test Infrastructure

TestStub Simulating External

System

Local Interface to External System

Page 61: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Doubles As Part of Test Infrastructure

TestStub Simulating External

System

Local Interface to External System

Page 62: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Doubles As Part of Test Infrastructure

TestStub Simulating External

System

Local Interface to External System

Public Interface

Page 63: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Doubles As Part of Test Infrastructure

TestStub Simulating External

System

Local Interface to External System

Public Interface

Page 64: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Doubles As Part of Test Infrastructure

TestStub Simulating External

System

Local Interface to External System

Test Infrastructure

Test Case

Test Case

Test Case

Test Case

Test Infrastructure Back-Channel

Public InterfaceSystem Under Test

Page 65: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

Page 66: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

Page 67: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Language of the Problem Domain - DSL

• A Simple ‘DSL’ Solves many of our problems • Ease of TestCase creation • Readability • Ease of Maintenance • Separation of “What” from “How” • Test Isolation • The Chance to abstract complex set-up and scenarios • …

Page 68: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Language of the Problem Domain - DSL @Test public void shouldSupportPlacingValidBuyAndSellLimitOrders() { trading.selectDealTicket("instrument"); trading.dealTicket.placeOrder("type: limit", ”bid: 4@10”); trading.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to buy 4.00 contracts at 10.0"); trading.dealTicket.dismissFeedbackMessage();

trading.dealTicket.placeOrder("type: limit", ”ask: 4@9”); trading.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to sell 4.00 contracts at 9.0"); }

Page 69: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Language of the Problem Domain - DSL @Test public void shouldSupportPlacingValidBuyAndSellLimitOrders() { trading.selectDealTicket("instrument"); trading.dealTicket.placeOrder("type: limit", ”bid: 4@10”); trading.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to buy 4.00 contracts at 10.0"); trading.dealTicket.dismissFeedbackMessage();

trading.dealTicket.placeOrder("type: limit", ”ask: 4@9”); trading.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to sell 4.00 contracts at 9.0"); }

@Test public void shouldSuccessfullyPlaceAnImmediateOrCancelBuyMarketOrder() { fixAPIMarketMaker.placeMassOrder("instrument", "ask: 11@52", "ask: 10@51", "ask: 10@50", "bid: 10@49");

fixAPI.placeOrder("instrument", "side: buy", "quantity: 4", "goodUntil: Immediate", "allowUnmatched: true"); fixAPI.waitForExecutionReport("executionType: Fill", "orderStatus: Filled", "side: buy", "quantity: 4", "matched: 4", "remaining: 0", "executionPrice: 50", "executionQuantity: 4"); }

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Language of the Problem Domain - DSL @Test public void shouldSupportPlacingValidBuyAndSellLimitOrders() { trading.selectDealTicket("instrument"); trading.dealTicket.placeOrder("type: limit", ”bid: 4@10”); trading.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to buy 4.00 contracts at 10.0"); trading.dealTicket.dismissFeedbackMessage();

trading.dealTicket.placeOrder("type: limit", ”ask: 4@9”); trading.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to sell 4.00 contracts at 9.0"); }

@Test public void shouldSuccessfullyPlaceAnImmediateOrCancelBuyMarketOrder() { fixAPIMarketMaker.placeMassOrder("instrument", "ask: 11@52", "ask: 10@51", "ask: 10@50", "bid: 10@49");

fixAPI.placeOrder("instrument", "side: buy", "quantity: 4", "goodUntil: Immediate", "allowUnmatched: true"); fixAPI.waitForExecutionReport("executionType: Fill", "orderStatus: Filled", "side: buy", "quantity: 4", "matched: 4", "remaining: 0", "executionPrice: 50", "executionQuantity: 4"); }

@Before public void beforeEveryTest() { adminAPI.createInstrument("name: instrument"); registrationAPI.createUser("user"); registrationAPI.createUser("marketMaker", "accountType: MARKET_MAKER"); tradingUI.loginAsLive("user"); }

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Language of the Problem Domain - DSL public void placeOrder(final String... args) { final DslParams params = new DslParams(args, new OptionalParam("type").setDefault("Limit").setAllowedValues("limit", "market", "StopMarket"), new OptionalParam("side").setDefault("Buy").setAllowedValues("buy", "sell"), new OptionalParam("price"), new OptionalParam("triggerPrice"), new OptionalParam("quantity"), new OptionalParam("stopProfitOffset"), new OptionalParam("stopLossOffset"), new OptionalParam("confirmFeedback").setDefault("true"));

getDealTicketPageDriver().placeOrder(params.value("type"), params.value("side"), params.value("price"), params.value("triggerPrice"), params.value("quantity"), params.value("stopProfitOffset"), params.value("stopLossOffset"));

if (params.valueAsBoolean("confirmFeedback")) { getDealTicketPageDriver().clickOrderFeedbackConfirmationButton(); }

LOGGER.debug("placeOrder(" + Arrays.deepToString(args) + ")"); }

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Language of the Problem Domain - DSL @Test public void shouldSupportPlacingValidBuyAndSellLimitOrders() { tradingUI.showDealTicket("instrument"); tradingUI.dealTicket.placeOrder("type: limit", ”bid: 4@10”); tradingUI.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to buy 4.00 contracts at 10.0"); tradingUI.dealTicket.dismissFeedbackMessage();

tradingUI.dealTicket.placeOrder("type: limit", ”ask: 4@9”); tradingUI.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to sell 4.00 contracts at 9.0"); }

@Test public void shouldSuccessfullyPlaceAnImmediateOrCancelBuyMarketOrder() { fixAPIMarketMaker.placeMassOrder("instrument", "ask: 11@52", "ask: 10@51", "ask: 10@50", "bid: 10@49");

fixAPI.placeOrder("instrument", "side: buy", "quantity: 4", "goodUntil: Immediate", "allowUnmatched: true"); fixAPI.waitForExecutionReport("executionType: Fill", "orderStatus: Filled", "side: buy", "quantity: 4", "matched: 4", "remaining: 0", "executionPrice: 50", "executionQuantity: 4"); }

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Language of the Problem Domain - DSL @Test public void shouldSupportPlacingValidBuyAndSellLimitOrders() { tradingUI.showDealTicket("instrument"); tradingUI.dealTicket.placeOrder("type: limit", ”bid: 4@10”); tradingUI.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to buy 4.00 contracts at 10.0"); tradingUI.dealTicket.dismissFeedbackMessage();

tradingUI.dealTicket.placeOrder("type: limit", ”ask: 4@9”); tradingUI.dealTicket.checkFeedbackMessage("You have successfully sent a limit order to sell 4.00 contracts at 9.0"); }

@Test public void shouldSuccessfullyPlaceAnImmediateOrCancelBuyMarketOrder() { fixAPIMarketMaker.placeMassOrder("instrument", "ask: 11@52", "ask: 10@51", "ask: 10@50", "bid: 10@49");

fixAPI.placeOrder("instrument", "side: buy", "quantity: 4", "goodUntil: Immediate", "allowUnmatched: true"); fixAPI.waitForExecutionReport("executionType: Fill", "orderStatus: Filled", "side: buy", "quantity: 4", "matched: 4", "remaining: 0", "executionPrice: 50", "executionQuantity: 4"); }

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Language of the Problem Domain - DSL

@Channel(fixApi, dealTicket, publicApi) @Test public void shouldSuccessfullyPlaceAnImmediateOrCancelBuyMarketOrder() { trading.placeOrder("instrument", "side: buy", “price: 123.45”, "quantity: 4", "goodUntil: Immediate”);

trading.waitForExecutionReport("executionType: Fill", "orderStatus: Filled", "side: buy", "quantity: 4", "matched: 4", "remaining: 0", "executionPrice: 123.45", "executionQuantity: 4"); }

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Language of the Problem Domain - DSL

@Channel(fixApi, dealTicket, publicApi) @Test public void shouldSuccessfullyPlaceAnImmediateOrCancelBuyMarketOrder() { trading.placeOrder("instrument", "side: buy", “price: 123.45”, "quantity: 4", "goodUntil: Immediate”);

trading.waitForExecutionReport("executionType: Fill", "orderStatus: Filled", "side: buy", "quantity: 4", "matched: 4", "remaining: 0", "executionPrice: 123.45", "executionQuantity: 4"); }

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Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

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Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

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Testing with Time

• Test Cases should be deterministic

• Time is a problem for determinism - There are two options:

• Ignore time

• Control time

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Testing With Time - Ignore TimeMechanism

Filter out time-based values in your test infrastructure so that they are ignored

Pros:• Simple!

Cons:• Can miss errors • Prevents any hope of testing complex time-based

scenarios

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Mechanism

Treat Time as an external dependency, like any external system - and Fake it!

Pros:• Very Flexible! • Can simulate any time-based scenario, with time under the

control of the test case.

Cons:• Slightly more complex infrastructure

Testing With Time - Controlling Time

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Testing With Time - Controlling Time

@Test public void shouldBeOverdueAfterOneMonth() {

book = library.borrowBook(“Continuous Delivery”); assertFalse(book.isOverdue());

time.travel(“+1 week”); assertFalse(book.isOverdue());

time.travel(“+4 weeks”); assertTrue(book.isOverdue());

}

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Testing With Time - Controlling Time

@Test public void shouldBeOverdueAfterOneMonth() {

book = library.borrowBook(“Continuous Delivery”); assertFalse(book.isOverdue());

time.travel(“+1 week”); assertFalse(book.isOverdue());

time.travel(“+4 weeks”); assertTrue(book.isOverdue());

}

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Testing With Time - Controlling Time

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Testing With Time - Controlling Time

Test Infrastructure

Test Case

Test Case

Test Case

Test Case

System Under Test

public void someTimeDependentMethod() {

time = System.getTime(); }

System Under Test

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Testing With Time - Controlling Time

Test Infrastructure

Test Case

Test Case

Test Case

Test Case

System Under Test

include Clock;

public void someTimeDependentMethod() {

time = Clock.getTime(); }

System Under Test

Page 86: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Testing With Time - Controlling Time

Test Infrastructure

Test Case

Test Case

Test Case

Test Case

System Under Test include Clock;

public void someTimeDependentMethod() {

time = Clock.getTime(); }

public class Clock { public static clock = new SystemClock();

public static void setTime(long newTime) { clock.setTime(newTime); }

public static long getTime() { return clock.getTime(); } System Under Test

Page 87: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Testing With Time - Controlling Time

Test Infrastructure

Test Case

Test Case

Test Case

Test Case

System Under Test include Clock;

public void someTimeDependentMethod() {

time = Clock.getTime(); }

public void onInit() { // Remote Call - back-channel systemUnderTest.setClock(new TestClock()); } public void time-travel(String time) { long newTime = parseTime(time); // Remote Call - back-channel systemUnderTest.setTime(newTime); }

Test Infrastructure Back-Channel

public class Clock { public static clock = new SystemClock();

public static void setTime(long newTime) { clock.setTime(newTime); }

public static long getTime() { return clock.getTime(); } System Under Test

Page 88: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Environment Types• Some Tests need special treatment.

• Tag Tests with properties and allocate them dynamically:

Page 89: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Environment Types• Some Tests need special treatment.

• Tag Tests with properties and allocate them dynamically:

@TimeTravel @Test public void shouldDoSomethingThatNeedsFakeTime() …

@Destructive @Test public void shouldDoSomethingThatKillsPartOfTheSystem() …

@FPGA(version=1.3) @Test public void shouldDoSomethingThatRequiresSpecificHardware() …

Page 90: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Test Environment Types• Some Tests need special treatment.

• Tag Tests with properties and allocate them dynamically:

@TimeTravel @Test public void shouldDoSomethingThatNeedsFakeTime() …

@Destructive @Test public void shouldDoSomethingThatKillsPartOfTheSystem() …

@FPGA(version=1.3) @Test public void shouldDoSomethingThatRequiresSpecificHardware() …

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Test Environment Types

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Test Environment Types

Page 93: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

Page 94: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Properties of Good Acceptance Tests• “What” not “How”

• Isolated from other tests

• Repeatable

• Uses the language of the problem domain

• Tests ANY change

• Efficient

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Production-like Test Environments

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Production-like Test Environments

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Production-like Test Environments

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Production-like Test Environments

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Production-like Test Environments

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Production-like Test Environments

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Production-like Test Environments

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Make Test Cases Internally Synchronous

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Make Test Cases Internally Synchronous

• Look for a “Concluding Event” listen for that in your DSL to report an async call as complete

Page 104: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Make Test Cases Internally Synchronous

Example DSL level Implementation…

public String placeOrder(String params…) {

orderSent = sendAsyncPlaceOrderMessage(parseOrderParams(params)); return waitForOrderConfirmedOrFailOnTimeOut(orderSent); }

• Look for a “Concluding Event” listen for that in your DSL to report an async call as complete

Page 105: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Make Test Cases Internally Synchronous

Example DSL level Implementation…

public String placeOrder(String params…) {

orderSent = sendAsyncPlaceOrderMessage(parseOrderParams(params)); return waitForOrderConfirmedOrFailOnTimeOut(orderSent); }

• Look for a “Concluding Event” listen for that in your DSL to report an async call as complete

Page 106: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Make Test Cases Internally Synchronous

• Look for a “Concluding Event” listen for that in your DSL to report an async call as complete

• If you really have to, implement a “poll-and-timeout” mechanism in your test-infrastructure

• Never, Never, Never, put a “wait(xx)” and expect your tests to be (a) Reliable or (b) Efficient!

• Look for a “Concluding Event” listen for that in your DSL to report an async call as complete

Page 107: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Make Test Cases Internally Synchronous

• Look for a “Concluding Event” listen for that in your DSL to report an async call as complete

• If you really have to, implement a “poll-and-timeout” mechanism in your test-infrastructure

• Never, Never, Never, put a “wait(xx)” and expect your tests to be (a) Reliable or (b) Efficient!

• Look for a “Concluding Event” listen for that in your DSL to report an async call as complete

Anti-Pattern!

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Scaling-Up

Artifact Repository

Deployment Pipeline

Acceptance

Commit

Component Performance

System Performance

Staging Env.

Deployment App.

Production Env.

Deployment App.

Source Repository

Manual Test Env.

Deployment App.

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Scaling-Up

Artifact Repository

Deployment Pipeline

Acceptance

Commit

Component Performance

System Performance

Staging Env.

Deployment App.

Production Env.

Deployment App.

Source Repository

Manual Test Env.

Deployment App.

Deployment PipelineCommit

Manual Test Env.

Deployment App.

Artifact Repository

Acceptance Acceptance Test Environment

Page 110: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Scaling-Up

Artifact Repository

Deployment Pipeline

Acceptance

Commit

Component Performance

System Performance

Staging Env.

Deployment App.

Production Env.

Deployment App.

Source Repository

Manual Test Env.

Deployment App.

Deployment PipelineCommit

Manual Test Env.

Deployment App.

Artifact Repository

Acceptance Acceptance Test Environment

AA

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Scaling-Up

Artifact Repository

Deployment Pipeline

Acceptance

Commit

Component Performance

System Performance

Staging Env.

Deployment App.

Production Env.

Deployment App.

Source Repository

Manual Test Env.

Deployment App.

Deployment PipelineCommit

Manual Test Env.

Deployment App.

Artifact Repository

Acceptance Acceptance Test EnvironmentA

A

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Scaling-Up

Artifact Repository

Deployment Pipeline

Acceptance

Commit

Component Performance

System Performance

Staging Env.

Deployment App.

Production Env.

Deployment App.

Source Repository

Manual Test Env.

Deployment App.

Deployment PipelineCommit

Manual Test Env.

Deployment App.

Artifact Repository

Acceptance Acceptance Test Environment

Test HostTest Host

Test Host

Test Host

Test Host

A

A

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Scaling-Up

Artifact Repository

Deployment Pipeline

Acceptance

Commit

Component Performance

System Performance

Staging Env.

Deployment App.

Production Env.

Deployment App.

Source Repository

Manual Test Env.

Deployment App.

Deployment PipelineCommit

Manual Test Env.

Deployment App.

Artifact Repository

Acceptance

Acceptance

Acceptance Test Environment

Test HostTest Host

Test Host

Test Host

Test Host

AA

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Anti-Patterns in Acceptance Testing

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Anti-Patterns in Acceptance Testing• Don’t use UI Record-and-playback Systems

Page 116: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Anti-Patterns in Acceptance Testing• Don’t use UI Record-and-playback Systems

• Don’t Record-and-playback production data. This has a role, but it is NOT Acceptance Testing

Page 117: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Anti-Patterns in Acceptance Testing• Don’t use UI Record-and-playback Systems

• Don’t Record-and-playback production data. This has a role, but it is NOT Acceptance Testing

• Don’t dump production data to your test systems, instead define the absolute minimum data that you need

Page 118: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Anti-Patterns in Acceptance Testing• Don’t use UI Record-and-playback Systems

• Don’t Record-and-playback production data. This has a role, but it is NOT Acceptance Testing

• Don’t dump production data to your test systems, instead define the absolute minimum data that you need

• Don’t assume Nasty Automated Testing Products(tm) will do what you need. Be very sceptical about them. Start with YOUR strategy and evaluate tools against that.

Page 119: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Anti-Patterns in Acceptance Testing• Don’t use UI Record-and-playback Systems

• Don’t Record-and-playback production data. This has a role, but it is NOT Acceptance Testing

• Don’t dump production data to your test systems, instead define the absolute minimum data that you need

• Don’t assume Nasty Automated Testing Products(tm) will do what you need. Be very sceptical about them. Start with YOUR strategy and evaluate tools against that.

• Don’t have a separate Testing/QA team! Quality is down to everyone - Developers own Acceptance Tests!!!

Page 120: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Anti-Patterns in Acceptance Testing• Don’t use UI Record-and-playback Systems

• Don’t Record-and-playback production data. This has a role, but it is NOT Acceptance Testing

• Don’t dump production data to your test systems, instead define the absolute minimum data that you need

• Don’t assume Nasty Automated Testing Products(tm) will do what you need. Be very sceptical about them. Start with YOUR strategy and evaluate tools against that.

• Don’t have a separate Testing/QA team! Quality is down to everyone - Developers own Acceptance Tests!!!

• Don’t let every Test start and init the app. Optimise for Cycle-Time, be efficient in your use of test environments.

Page 121: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Anti-Patterns in Acceptance Testing• Don’t use UI Record-and-playback Systems

• Don’t Record-and-playback production data. This has a role, but it is NOT Acceptance Testing

• Don’t dump production data to your test systems, instead define the absolute minimum data that you need

• Don’t assume Nasty Automated Testing Products(tm) will do what you need. Be very sceptical about them. Start with YOUR strategy and evaluate tools against that.

• Don’t have a separate Testing/QA team! Quality is down to everyone - Developers own Acceptance Tests!!!

• Don’t let every Test start and init the app. Optimise for Cycle-Time, be efficient in your use of test environments.

• Don’t include Systems outside of your control in your Acceptance Test Scope

Page 122: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Anti-Patterns in Acceptance Testing• Don’t use UI Record-and-playback Systems

• Don’t Record-and-playback production data. This has a role, but it is NOT Acceptance Testing

• Don’t dump production data to your test systems, instead define the absolute minimum data that you need

• Don’t assume Nasty Automated Testing Products(tm) will do what you need. Be very sceptical about them. Start with YOUR strategy and evaluate tools against that.

• Don’t have a separate Testing/QA team! Quality is down to everyone - Developers own Acceptance Tests!!!

• Don’t let every Test start and init the app. Optimise for Cycle-Time, be efficient in your use of test environments.

• Don’t include Systems outside of your control in your Acceptance Test Scope

• Don’t Put ‘wait()’ instructions in your tests hoping it will solve intermittency

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Tricks for Success

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Tricks for Success• Do Ensure That Developers Own the Tests

Page 125: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

Page 126: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

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Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

• Do Make Acceptance Testing Part of your “Definition of Done”

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Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

• Do Make Acceptance Testing Part of your “Definition of Done”

• Do Keep Tests Isolated from one-another

Page 129: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

• Do Make Acceptance Testing Part of your “Definition of Done”

• Do Keep Tests Isolated from one-another

• Do Keep Your Tests Repeatable

Page 130: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

• Do Make Acceptance Testing Part of your “Definition of Done”

• Do Keep Tests Isolated from one-another

• Do Keep Your Tests Repeatable

• Do Use the Language of the Problem Domain - Do try the DSL approach, whatever your tech.

Page 131: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

• Do Make Acceptance Testing Part of your “Definition of Done”

• Do Keep Tests Isolated from one-another

• Do Keep Your Tests Repeatable

• Do Use the Language of the Problem Domain - Do try the DSL approach, whatever your tech.

• Do Stub External Systems

Page 132: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

• Do Make Acceptance Testing Part of your “Definition of Done”

• Do Keep Tests Isolated from one-another

• Do Keep Your Tests Repeatable

• Do Use the Language of the Problem Domain - Do try the DSL approach, whatever your tech.

• Do Stub External Systems

• Do Test in “Production-Like” Environments

Page 133: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

• Do Make Acceptance Testing Part of your “Definition of Done”

• Do Keep Tests Isolated from one-another

• Do Keep Your Tests Repeatable

• Do Use the Language of the Problem Domain - Do try the DSL approach, whatever your tech.

• Do Stub External Systems

• Do Test in “Production-Like” Environments

• Do Make Instructions Appear Synchronous at the Level of the Test Case

Page 134: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

• Do Make Acceptance Testing Part of your “Definition of Done”

• Do Keep Tests Isolated from one-another

• Do Keep Your Tests Repeatable

• Do Use the Language of the Problem Domain - Do try the DSL approach, whatever your tech.

• Do Stub External Systems

• Do Test in “Production-Like” Environments

• Do Make Instructions Appear Synchronous at the Level of the Test Case

• Do Test for ANY change

Page 135: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Tricks for Success• Do Ensure That Developers Own the Tests

• Do Focus Your Tests on “What” not “How”

• Do Think of Your Tests as “Executable Specifications”

• Do Make Acceptance Testing Part of your “Definition of Done”

• Do Keep Tests Isolated from one-another

• Do Keep Your Tests Repeatable

• Do Use the Language of the Problem Domain - Do try the DSL approach, whatever your tech.

• Do Stub External Systems

• Do Test in “Production-Like” Environments

• Do Make Instructions Appear Synchronous at the Level of the Test Case

• Do Test for ANY change

• Do Keep your Tests Efficient

Page 136: Acceptance Testing for Continuous Deliverygotocon.com/dl/photos/web/Dave Farley Acceptance Testing...Acceptance Testing for Continuous Delivery The Role of Acceptance Testing Local

Q&A

http://www.continuous-delivery.co.uk

Dave Farley

http://www.davefarley.net

@davefarley77