Avatars of Test Driven Development (TDD)

Avatars of TDDRule of Diversity

Distrust all claims for “One True Way”

Naresh Jainnaresh@agilefaqs.com

@nashjain http://nareshjain.com

Key Questions

Are we building the right product?

Are we building the product right?

Business Facing

Technology/Implementation Facing

Brian Marick’s Test Categorization

Business Facing

ritique product

Before/While Coding Post Coding

It Helps to Think of Tests this way...

Business Facing

t Critique productUnit Testing

Acceptance Testing Low-fi prototypes

Exploratory TestingUI and Usability Testing

Performance TestingSystem Tests

Business Facing

t Critique product

Outside In

Inside Out

Brian Marick’s Test Categorization

Add a Test

Run the Test

Make a little change

Run the Test

Refactor

TDD RhythmTest, Code, Refactor

Acceptance Test Driven Development

Iteration

Automated Acceptance Tests

AutomatedAcceptance Tests

Acceptance Criteria

ExploratoryTesting

Automated UI Tests

PERFORMENCE

Automated Unit Test

Commercial Break!

Tech Talks!

Veterinarian Information System

It all started with...

Outside In: ATDDFitnesse Document:Assertions: 17 right, 0 wrong, 0 ignored, 0 exceptions

com.vis.billing.fixtures.PaidCashBill

account details

account number patient name owner name

1001 Fluffy Dave Atkins

procedure detailsname cost

Routine Office Visit 250

Rabies Vaccination 50

account number? owner name? patient name? total? paid?

1001 Dave Atkins Fluffy 300 false

procedure details on the bill

name cost

Routine Office Visit 250

Rabies Vaccination 50

pay Cash

patient name? owner name? account number? bill no? payment method? amount paid?

Fluffy Dave Atkins 1001 1 Cash 300

check paid true

check total 0

Outside In: Output

ATDD: Another ExampleAcceptance test:class FluffyTest < Test::Unit::TestCase def test_examination_and_shots vet = Veterinarian.new clinic = Clinic.new "Main Line health" dave = Owner.new "Dave" fluffy = Patient.new "Fluffy" dave.has fluffy visit = clinic.visit(fluffy, vet) do |v| v.procedure "Rabies vaccination", 50 end invoice = visit.invoice assert_equal invoice.to_s, <<-INVOICE Routine visit: $200 Rabies vaccination: $50 Total: $250 INVOICE receipt = clinic.pay_for visit, 100 assert_equal receipt.to_s, <<-RECEIPT Paid $100 for Routine visit Paid $0 for Rabies vaccination Outstanding: $150 RECEIPT endend

Outside In: Output

Inside Out: Unit TDDpublic class ClinicTest { private Clinic clinic = new Clinic();

@Test public void amountOnTheReceiptShouldMatchBillableAmount() throws Exception { Billable billable = new Billable() { public int totalAmount() { return 0; } }; Account dave = new Account(101, "Dave");

Receipt rcpt = clinic.payCash(dave, billable); assertEquals("Amount on receipt does match procedure cost", billable.totalAmount(), rcpt.getAmount()); }

@Test public void customerPayesBillableAmountForCashTransaction() throws Exception { final int billableAmount = 56; class AmountCharged { int charged; }; final AmountCharged charged = new AmountCharged();

Billable billable = new Billable() { public int totalAmount() { return billableAmount; } };

Account dave = new Account(101, "Dave") { public void charge(int amount) { charged.charged = amount; } };

clinic.payCash(dave, billable); assertEquals("Account is not charged billable amount", billableAmount,charged.charged); }}

public class BillableTest {

private static final Account daveSAccount = new Account(101, "Dave"); private static final List<Service> services = new ArrayList<Service>();

@Test public void totalBillableAmountShouldBeZeroIfNoServicesAreProvided() { Billable bill = new Bill(daveSAccount, services); assertEquals("Total amount is not Zero", 0, bill.totalAmount()); }

@Test public void totalBillableAmountShouldBeTotalOfEachServiceProvided() { services.add(new Procedure("Rabies Vaccination", 250)); services.add(new Procedure("Regular office Visit", 50));

Billable bill = new Bill(daveSAccount, services);

assertEquals("Total Amount is not 300", 300, bill.totalAmount()); }

@After public void cleanUp() { services.clear(); }}

Inside Out: Output

Inside Out: Another Examplepublic class ChargeAccountForServices { private static final Billable bill = createMock(Billable.class); private static final Accountable account = createMock(Accountable.class); private static final Clinic clinic = new Clinic();

@Before public void setUp() { reset(account); reset(bill); }

@Test public void shouldMakePaymentsAgainstAnAccount() { account.paid(bill); replay(account); clinic.pay(300, bill, account); verify(account); }

@Test public void shouldHaveZeroAmountDueOnReceiptIfCompletePaymentIsMade() { expect(bill.amount()).andReturn(300); replay(bill); Receipt receipt = clinic.pay(300, bill, account); verify(bill); assertEquals(300, receipt.amount()); assertEquals(0, receipt.amountDue()); }

@Test public void shouldDisplayAmountDueOnTheReceiptIfIncompletePaymentIsMade() { expect(bill.amount()).andReturn(500); replay(bill); Receipt receipt = clinic.pay(300, bill, account); verify(bill); assertEquals(300, receipt.amount()); assertEquals(200, receipt.amountDue()); }}

public class CreateBillForClientAccount { private static final List<Service> services = new ArrayList<Service>(); private static final Accountable account = createMock(Accountable.class); private Bill bill;

@Before public void setUp() { reset(account); }

@Test public void shouldThrowExceptionIfAccountIsNotDueForPayment() { expect(account.isPaymentDue()).andReturn(false); replay(account); try { new Bill(account, null); } catch (NoPaymentDueException e) { // expected } verify(account); }

@After public void cleanUp() { services.clear(); }

@Test public void shouldCreateABillWithTheTotalCostOfAllTheServices() { IMocksControl control = createControl(); Service rabiesVaccination = control.createMock(Service.class); Service routineVisit = control.createMock(Service.class); services.add(rabiesVaccination); services.add(routineVisit);

expect(account.isPaymentDue()).andReturn(true); expect(account.unpaidServices()).andReturn(services); bill();

expect(rabiesVaccination.cost()).andReturn(250); expect(routineVisit.cost()).andReturn(50);

control.replay();

assertEquals(300, bill.amount()); control.verify(); }

private void bill() throws NoPaymentDueException { replay(account); bill = new Bill(account, null); verify(account); }}

Inside Out: Example Continued...

Inside Out: Output

Where do you Stand?

Unit Test x Acceptance test

API x User Interface

State x Interaction

OO x Procedural

Easy x Core

Narrow x Broad

Drive Design x Validate Design

Bonus Calculator

Sales Quota Commission % Tax % Result1200 1100 10 10 91200 1500 10 10 01200 1200 10 10 0

First Few Tests Inside-Out Tests @Test! public void noBonusForLowPerformers() {! ! whenSalesIs(0).andQuotaIs(100).thenIndividualBonusIs(0);! }

! @Test! public void noBonusForAveragePerformers() {! ! whenSalesIs(100).andQuotaIs(100).thenIndividualBonusIs(0);! }

! @Test! public void bonusIsBasedOnCommissionPercentage() {! ! whenSalesIs(110).andQuotaIs(10).andCommissionIs(100).thenIndividualBonusIs(100);! ! whenSalesIs(110).andQuotaIs(10).andCommissionIs(10).thenIndividualBonusIs(10);! }

! @Test! public void bonusIsBasedOnCommissionPercentageAfterTax() {! ! whenSalesIs(110).andQuotaIs(10).andCommissionIs(100).andTaxIs(10).thenIndividualBonusIs(90);! ! whenSalesIs(110.02).andQuotaIs(10.01).andCommissionIs(10).andTaxIs(10).thenIndividualBonusIs(9);! }

Sales TaxBasic sales tax is applicable at a rate of 10% on all goods, except books, food, and medical products that are exempt. Import duty is an additional sales tax applicable on all imported goods at a rate of 5%, with no exemptions.

When I purchase items I receive a receipt which lists the name of all the items and their price (including tax), finishing with the total cost of the items, and the total amounts of sales taxes paid.

Write an application that prints out the receipt details for these shopping baskets...

Input 1:1 book at 12.491 music CD at 14.991 chocolate bar at 0.85

Output 1:1 book : 12.491 music CD: 16.491 chocolate bar: 0.85Sales Taxes: 1.50Total: 29.83

Input 2:1 imported box of chocolates at 10.001 imported bottle of perfume at 47.50

Output 2:1 imported box of chocolates: 10.501 imported bottle of perfume: 54.65Sales Taxes: 7.65Total: 65.15

Input 3:1 imported bottle of perfume at 27.991 bottle of perfume at 18.991 packet of headache pills at 9.751 box of imported chocolates at 11.25

Output 3:1 imported bottle of perfume: 32.191 bottle of perfume: 20.891 packet of headache pills: 9.751 imported box of chocolates: 11.85Sales Taxes: 6.70Total: 74.68

First Few Outside-In Tests@Testpublic void checkOutEmptyCart() { assertTotalIs(0);}

@Testpublic void checkOutAnExemptedDomesticItem() { cart.add(rs100DomesticBook); assertTotalIs(100);}

@Testpublic void checkOutTaxableDomesticItem() { cart.add(rs100DomesticMusicCD); assertTotalIs(110);}

@Testpublic void checkOutExemptedImportedItem() { cart.add(rs100ImportedBook); assertTotalIs(105);}

@Testpublic void checkOutImportedItem() { cart.add(rs100ImportedMacBook); assertTotalIs(115);}

Medical System Age Calculating ProgramAge Reported in

Greater than 1 Year <Patient Name> is # Years old

> 1 Month & < 1 Year <Patient Name> is # Months old

> 1 Day & < 1 Month <Patient Name> is # Days old

> 1 Hr & < 1 Day <Patient Name> is # Hours old

Doctors and Nurses might like to add and remove new Durations.For Ex: If they add Decade, and Patient’s age is greater than 10 years, then age should be reported as <Patient Name> is # Decades old.

Similarly: If they add Week, and Patient’s age is greater than 7 Day, but less than a month, then age should be reported as <Patient Name> is # Weeks old.

First Few Inside-Out Tests@RunWith(Parameterized.class)public class DurationTest extends FixedTimeTestCase {! private final Date date;! private final String result;

! public DurationTest(Object date, Object result) {! ! this.date = (Date) date;! ! this.result = (String) result;! }

! @Parameters! public static List<Object[]> data() {! ! return new ArrayList<Object[]>() {! ! ! {! ! ! ! add(new Object[] { may3rd1980, "31 Years" });! ! ! ! add(new Object[] { jan1st2011, "9 Months" });! ! ! ! add(new Object[] { oct1st2011, "10 Days" });! ! ! ! add(new Object[] { oct11nth2011Afternoon, "0 Hours" });! ! ! }! ! };! }

! @Test! public void calculatesDurationSince() {! ! String value = Duration.since(date);! ! assertEquals("For " + date, result, value);! }

! @Override! protected Date currentTime() {! ! return oct11nth2011Afternoon;! }}

@Testpublic void canRegisterAndUnregisterLargestDuration() { assertEquals("31 Years", Duration.since(may3rd1980));

Duration.register("Decades", MILLISECONDS_PER_YEAR * 10); assertEquals("3 Decades", Duration.since(may3rd1980));

Duration.unregister("Decades"); assertEquals("31 Years", Duration.since(may3rd1980));}

@Testpublic void canRegisterAndUnregisterSmallestDuration() { assertEquals("0 Hours", Duration.since(oct11nth2011Morning));

Duration.register("Minutes", MILLISECONDS_PER_MINUTE); assertEquals("2 Minutes", Duration.since(oct11nth2011Morning));

Duration.unregister("Minutes"); assertEquals("0 Hours", Duration.since(oct11nth2011Morning));}

Meeting Assistant

First Few Outside-In Tests

@Testpublic void jackWantsThinkingTime() { jack().isAvailable(now).forEver(); firstAvailableSlotFor(THIRTY_MINS).is(now);}

@Testpublic void jackBusyForNextTwoHours() { jack().isAvailable(inTwoHours).forEver(); firstAvailableSlotFor(THIRTY_MINS).is(inTwoHours);}

@Testpublic void jackAndJillAreAvailableRightNowToMeet() { jack().isAvailable(now).forEver(); jill().isAvailable(now).forEver(); between(JACK, JILL).firstAvailableSlotFor(THIRTY_MINS).is(now);}

@Testpublic void jackIsAvailableLaterForARequiredDuration() { jack().isAvailable(now).forNext(TWENTY_MINS); jack().isAvailable(inTwoHours).forEver(); firstAvailableSlotFor(THIRTY_MINS).is(inTwoHours);}

@Test(expected = RuntimeException.class)public void jackHasNoTimeToThink() { jack().isNotAvailable(); assistant.firstAvailableTimeFor(participants, THIRTY_MINS);}

Where do you Stand?

Unit Test x Acceptance test

API x User Interface

State x Interaction

OO x Procedural

Easy x Core

Narrow x Broad

Drive Design x Validate Design

Thank you

Naresh Jainnaresh@agilefaqs.com

Avatars of Test Driven Development (TDD)

Technology

Transcript of Avatars of Test Driven Development (TDD)

Test Driven Development (TDD) Basics

Introdução ao TDD (Test-Driven Development) - #guma10anos

TDD - Short for Test Driven Development!

Test Driven Development (TDD)

Avatars Of TDD

Conduite de Projet Cours 9 Test-Driven Developmentzack/teaching/1718/cproj/cours-09-tdd-intro.pdf · Test-Driven Development (TDD) Test-Driven Development, or TDD, is an iterativesoftware

TEST-DRIVEN DEVELOPMENT 1. Test-Driven Development (TDD) Test-driven development (TDD) is a software development process that relies on the repetition.

Introdução ao Test Driven Development (TDD)

Overview on TDD (Test Driven Development) & ATDD (Acceptance Test Driven Development)

TDD (Test Driven Design)

TDD (Test-Driven Development)

Audio- and Gaze-driven Facial Animation of Codec Avatars

TDD: Team-Driven Development

Lightning talk - Test Driven Development (TDD)

Conduite de Projet Cours 9 Test-Driven Developmentzack/teaching/1819/cproj/cours-09-tdd-intro.pdf · Test-Driven Development (TDD) Test-Driven Development, or TDD, is an iterativesoftware

Atelier TDD (Test Driven Development)

Avatars of TDD - Agile India€¦ · Avatars of TDD Rule of Diversity ... Outside In Inside Out Brian Marick’s Test Categorization Saturday 2 March 2013 5. TDD Rhythm Test, Code,

Test Driven iOS Development (TDD)

Test Driven Development - TDD & ATDD

AgileCamp’11 Новосибирск - Test Driven Development (TDD)