Acceptance Test Driven Development

Acceptance Test Driven Development Bringing Testers and Developers Together John Ferguson Smart Wakaleo Consulting Ltd. http://www.wakaleo.com Email: john.smart@wakaleo.com Twitter: wakaleo

Introduction ,[object Object],[object Object],[object Object],[object Object]

Acceptance Tests ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Acceptance Tests ,[object Object],[object Object],[object Object]

Acceptance Tests ,[object Object],So how do we know when this feature is done? Let’s write some Acceptance Criteria User Story 1 - Calculate my tax rate As a tax payer, I want to be able to calculate my tax online, so that I can put enough money aside. User Story 1 - Calculate my tax rate As a tax payer, I want to be able to calculate my tax online, so that I can put enough money aside. User Story 1 - Transfer funds As a bank client, I want to transfer funds from my current account to my savings account, so that I can earn more interest User Story 1 - Acceptance Tests - Client can transfer money between two accounts - Client can’t transfer negative amount - Client can’t transfer more than current account balance - Client can’t transfer from a blocked account

Acceptance Tests ,[object Object],[object Object],[object Object],[object Object],[object Object],User Story 1 - Acceptance Tests - Client can transfer money between two accounts - Client can’t transfer negative amount - Client can’t transfer more than current account balance - Client can’t transfer from a blocked account

Acceptance Test-Driven Development ,[object Object],Iteration n-1 Iteration n Iteration n+1 ,[object Object],[object Object],[object Object],[object Object]

Acceptance Test-Driven Development ,[object Object],[object Object],[object Object],[object Object]

Tools for the job ,[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Introducing easyb BDD Acceptance Testing

[object Object],[object Object],[object Object],Easyb in Action

[object Object],[object Object],[object Object],[object Object],Easyb Specifications

Easyb Specifications ,[object Object],Start off with our acceptance criteria description "A client should be able to transfer money between accounts" it "should let a client transfer money from a current to a savings a/c" it "should not allow a client to transfer a negative amount" it "should not allow a client to transfer more than the current balance" it "should not allow a client to transfer from a blocked account" Express these in Easyb AccountTransfer.specifications User Story 1 - Acceptance Tests - Client can transfer money between two accounts - Client can’t transfer negative amount - Client can’t transfer more than current account balance - Client can’t transfer from a blocked account

Easyb Specifications ,[object Object],[object Object],description "A client should be able to transfer money between accounts" it "should let a client transfer money from a current to a savings a/c" it "should not allow a client to transfer a negative amount" it "should not allow a client to transfer more than the current balance" it "should not allow a client to transfer from a blocked account" This code will run! The tests are marked as ‘PENDING’

Easyb Specifications ,[object Object],[object Object]

Easyb Specifications ,[object Object],[object Object],package com.wakaleo.accounts.domain description "A client should be able to transfer money between accounts" it "should let a client transfer money from a current to a savings a/c" , { current = new Account(200) savings = new Account(300) current.transferTo(savings, 50) savings.balance.shouldBe 350 current.balance.shouldBe 150 } it "should not allow a client to transfer a negative amount" it "should not allow a client to transfer more than the current balance" it "should not allow a client to transfer from a blocked account" A developer implements the test in Groovy No longer pending Still pending...

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Easyb Stories

Easyb Stories ,[object Object],[object Object],[object Object],scenario "A client can transfer money from a current to a savings a/c" scenario "A client is not allowed to transfer a negative amount" scenario "A client is not allowed to transfer more than the current balance" scenario "A client is not allowed to transfer from a blocked account" AccountTransfer.story User Story 1 - Acceptance Tests - Client can transfer money between two accounts - Client can’t transfer negative amount - Client can’t transfer more than current account balance - Client can’t transfer from a blocked account

Easyb Stories ,[object Object],[object Object],[object Object],[object Object],[object Object],scenario "A client can transfer money from a current to a savings a/c" , { given 'a current a/c with $200 and a savings a/c with $300' when 'you transfer $50 from the current a/c to the savings a/c' then 'the savings a/c should have $350 and the current a/c $150' }

[object Object],Easyb Stories package com.wakaleo.accounts.domain scenario "A client can transfer money from a current to a savings a/c" , { given 'a current a/c with $200 and a savings a/c with $300' , { current = new Account(200) savings = new Account(300) } when 'you transfer $50 from the current a/c to the savings a/c' , { current . transferTo ( savings , 50) } then 'the savings a/c should have $350 and the current a/c $150' , { savings . balance . shouldBe 350 current . balance . shouldBe 150 } } scenario "A client is not allowed to transfer a negative amount" scenario "A client is not allowed to transfer more than the current balance" scenario "A client is not allowed to transfer from a blocked account"

[object Object],Easyb Stories package com.wakaleo.accounts.domain scenario "A client can transfer money from a current to a savings a/c" , { given 'a current a/c with $200' , { current = new Account(200) } and 'a savings a/c with $300' , { savings = new Account(300) } when 'you transfer $50 from the current a/c to the savings a/c' , { current . transferTo ( savings , 50) } then 'the savings a/c should have $350 and the current a/c $150' , { savings . balance . shouldBe 350 } and 'the current a/c should have $150' , { current . balance . shouldBe 150 } } scenario "A client is not allowed to transfer a negative amount" scenario "A client is not allowed to transfer more than the current balance" scenario "A client is not allowed to transfer from a blocked account" Using ‘and’ for more clarity

[object Object],[object Object],[object Object],[object Object],Easyb assertions account.balance.shouldBe initialAmount account.balance.shouldBeEqualTo initialAmount account.balance.shouldNotBe 0 account.balance.shouldBeGreaterThan 0 account.shouldHave(balance:initialAmount)

[object Object],Easyb Stories package com.wakaleo.accounts.domain scenario "A client can transfer money from a current to a savings a/c" , { ... } scenario "A client is not allowed to transfer a negative amount" , { given 'a current a/c with $200' , { current = new Account(200) } and 'a savings a/c with $300' , { savings = new Account(300) } when "you try to transfer a negative amount" , { transferNegativeAmount = { current.transferTo(savings, -50) } } then "an IllegalTransferException should be thrown" , { ensureThrows(IllegalTransferException. class ) { transferNegativeAmount() } } } scenario "A client is not allowed to transfer more than the current balance" scenario "A client is not allowed to transfer from a blocked account" Create a closure representing this operation Fail if the exception is not thrown

Easyb fixtures ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],Easyb fixtures before_each "setup the test accounts" , { given 'a current a/c with $200' , { current = new Account(200) } and 'a savings a/c with $300' , { savings = new Account(300) } } scenario "A client can transfer money from a current to a savings a/c" , { when 'you transfer $50 from the current a/c to the savings a/c' , { current . transferTo ( savings , 50) } then 'the savings a/c should have $350 and the current a/c $150' , { savings . balance . shouldBe 350 } and 'the current a/c should have $150' , { current . balance . shouldBe 150 } } scenario "A client is not allowed to transfer a negative amount" , { when "you try to transfer a negative amount" , { transferNegativeAmount = { current . transferTo ( savings , -50) } } then "an IllegalTransferException should be thrown" , { ensureThrows (IllegalTransferException. class ) { transferNegativeAmount () } } } This will be done before each scenario

Easyb fixtures ,[object Object],[object Object],shared_behavior "shared behaviors" , { given "a string" , { var = "" } when "the string is hello world" , { var = "hello world" } } scenario "first scenario" , { it_behaves_as "shared behaviors" then "the string should start with hello" , { var . shouldStartWith "hello" } } scenario "second scenario" , { it_behaves_as "shared behaviors" then "the string should end with world" , { var . shouldEndWith "world" } } Common behavior (‘shared_behavior’) Reused here (‘it_behaves_as’)... ...and here

Web testing with easyb ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Web testing with easyb ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Web testing with easyb ,[object Object],import net.sourceforge.jwebunit.junit.WebTester before_each "initialize a web test client" , { given "we have a web test client" , { tester = new WebTester() tester.setBaseUrl( "http://localhost:8080/tweeter-web" ) } } scenario "User signup should add a new user" , { when "I click on the sign up button on the home page" , { tester.beginAt( "/home" ) tester.clickLinkWithText( "Sign up now!" ) } and "I enter a new username and password" , { tester.setTextField( "username" , "jane" ) tester.setTextField( "password" , "tiger" ) tester.submit() } then "the application should log me on as the new user and show a welcome message" , { tester.assertTextPresent( "Hi jane!" ) } } Set up a JWebUnit client Click on a link Enter some values Check the results

[object Object],Easyb reports Test results summary Failed stories Unimplemented stories

[object Object],Easyb reports Test results summary Test failure details Unimplemented stories

[object Object],[object Object],[object Object],[object Object],Other Approaches

[object Object],[object Object],[object Object],FitNesse

[object Object],FitNesse Test data and scenarios as a table Test data Expected results

[object Object],FitNesse Testers can write/edit the Wiki pages You can also import to and from Excel

[object Object],FitNesse public class TransferMoneyBetweenAccounts { private BigDecimal savingsBalance ; private BigDecimal currentBalance ; private BigDecimal transfer ; private BigDecimal finalSavingsBalance ; private BigDecimal finalCurrentBalance ; private boolean exceptionThrown ; public void setSavingsBalance(BigDecimal savingsBalance) {...} public void setCurrentBalance(BigDecimal currentBalance) {...} public void setTransfer(BigDecimal transfer) {...} public BigDecimal finalCurrentBalance() {...} public BigDecimal finalSavingsBalance() {...} public boolean exceptionThrown() {...} public void execute() { Account currentAccount = new Account( currentBalance ); Account savingsAccount = new Account( savingsBalance ); exceptionThrown = false ; try { currentAccount.transferTo(savingsAccount, transfer ); finalCurrentBalance = currentAccount.getBalance(); finalSavingsBalance = savingsAccount.getBalance(); } catch (IllegalTransferException e) { exceptionThrown = true ; } } } Tests are implemented by Java classes Each column has a field in the class Expected results have getters Performing the test

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Commercial options?

Thank You John Ferguson Smart Wakaleo Consulting Ltd. http://www.wakaleo.com Email: john.smart@wakaleo.com Twitter: wakaleo

Acceptance Test Driven Development

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