Bdd: Tdd and beyond the infinite

BEHAVIOUR DRIVEN DEVELOPMENT: TDD AND BEYOND THE INFINITE

end; // CellText := str; except // Gabriele non t'ha beccato, Gigi neppure, a chi toccherà? end; end;

while ((! found ) && ( pos < ( fileContent . Length - 6))) { byteData = new byte[6]; Array . Copy ( fileContent , pos , byteData , 0, 6); pos = pos + 6; str_byteData = enc . GetString ( byteData ); if ( str_byteData . Contains ( "s" )) { posE_byteData = str_byteData . IndexOf ( "s" ); pos = pos + ( posE_byteData - 6); Array . Copy ( fileContent , pos , byteData , 0, 6); pos = pos + 6; if ( byteData [0] == 0x73) // 's' { if ( byteData [1] == 0x74) // 't' { if ( byteData [2] == 0x72) // 'r' { if ( byteData [3] == 0x65) // 'e' { if ( byteData [4] == 0x61) // 'a' { if ( byteData [5] == 0x6D) // 'm' { found = true; break; } else { if ( byteData [5] == 0x73) { pos = pos - 1; } } }

function TfrmPreviewTrascr.DBToLinear(DB: Double): Double; begin //Result := Power(10, DB/20)*1; Result := Power(10, DB / 100) * 1; { TODO : trovare la relazione corretta } //LisyLabel4.Caption := Format('%.2f:%.2f', [DB, Result] ); end;

Kent Beck gave Tdd to programmers!

The Three Laws of TDD 1 - You are not allowed to write any production code unless it is to make a failing unit test pass.

The Three Laws of TDD 1 - You are not allowed to write any production code unless it is to make a failing unit test pass. 2 - You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures.

The Three Laws of TDD 1 - You are not allowed to write any production code unless it is to make a failing unit test pass. 2 - You are not allowed to write any more of a unit test than is sufficient to fail; and compilation failures are failures. 3 - You are not allowed to write any more production code than is sufficient to pass the one failing unit test.

Is that the end of our problems?

I’m a programmer, not a tester!

My code it’s difficult to test!

It’s a trivial, doesn’t need a test!

I’ve no time to make automatic tests!

Sapir-Whorf hypotesis “ there is a systematic relationship between the grammatical categories of the language a person speaks and how that person both understands the world and behaves in it.”

for ( var i = 1 ; i <= 100 ; i++){ var output = i + ": " ; if (i % 3 == 0 ) output += "fizz" ; if (i % 5 == 0 ) output += "buzz" ; console.log(output); } 48 sec

for ( var i = 1 ; i <= 100 ; i++){ var output = i + ": " ; if (i % 3 == 0 ) output += "fizz" ; if (i % 5 == 0 ) output += "buzz" ; console.log(output); } But it’s wrong!

puts ( 1 . .100 ). map { | n | '1' * n + ":#{n} " }. join . gsub ( /^(1{5})*:/,'Buzz').gsub(/^(1{3})*:/,'Fizz').gsub(/.*:|(z)+/ , '' ) WTF?!?!!

package biz . scalzo . tdd ; import junit . framework . Assert ; import org . junit . Test ; import biz . scalzo . tdd . Fizzbuzzer ; public class FizzbuzzTest { @Test public void testForOne (){ Assert . assertEquals ( "1" , new Fizzbuzzer (). count ( 1 )); } } FizzbuzzTest.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int i ) { return null ; } } Fizzbuzzer.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int i ) { return "1" ; } } Fizzbuzzer.java

@Test public void testForTwo (){ Assert . assertEquals ( "2" , new Fizzbuzzer (). count ( 2 )); } FizzbuzzTest.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int i ) { return Integer . toString ( i ); } } Fizzbuzzer.java

@Test public void testForThree (){ Assert . assertEquals ( "Fizz" , new Fizzbuzzer (). count ( 3 )); } FizzbuzzTest.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int i ) { if ( i == 3 ) return "Fizz" ; return Integer . toString ( i ); } } Fizzbuzzer.java

@Test public void testForFour (){ Assert . assertEquals ( "4" , new Fizzbuzzer (). count ( 4 )); } FizzbuzzTest.java

@Test public void testForFive (){ Assert . assertEquals ( "Buzz" , new Fizzbuzzer (). count ( 5 )); } FizzbuzzTest.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int i ) { if ( i == 3 ) return "Fizz" ; if ( i == 5 ) return "Buzz" ; return Integer . toString ( i ); } } Fizzbuzzer.java

@Test public void testForSix (){ Assert . assertEquals ( "Fizz" , new Fizzbuzzer (). count ( 6 )); } FizzbuzzTest.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int i ) { if ( i % 3 == 0 ) return "Fizz" ; if ( i == 5 ) return "Buzz" ; return Integer . toString ( i ); } } Fizzbuzzer.java

@Test public void testForSeven (){ Assert . assertEquals ( “7" , new Fizzbuzzer (). count ( 7 )); } FizzbuzzTest.java

@Test public void testForEight (){ Assert . assertEquals ( “8" , new Fizzbuzzer (). count ( 8 )); } FizzbuzzTest.java

@Test public void testForNine (){ Assert . assertEquals ( “Fizz" , new Fizzbuzzer (). count ( 9 )); } FizzbuzzTest.java

@Test public void testForTen (){ Assert . assertEquals ( "Buzz" , new Fizzbuzzer (). count ( 10 )); } FizzbuzzTest.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int i ) { if ( i % 3 == 0 ) return "Fizz" ; if ( i % 5 == 0 ) return "Buzz" ; return Integer . toString ( i ); } } Fizzbuzzer.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int number ) { if ( isMultipleOf ( number , 3 )) return "Fizz" ; if ( isMultipleOf ( number , 5 )) return "Buzz" ; return Integer . toString ( number ); } private boolean isMultipleOf ( int number , int multiple ) { return number % multiple == 0 ; } } Fizzbuzzer.java

@Test public void testForFifteen (){ Assert . assertEquals ( "FizzBuzz" , new Fizzbuzzer (). count ( 15 )); } FizzbuzzTest.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int number ) { if ( isMultipleOf ( number , 3 ) && isMultipleOf ( number , 5 )) return "FizzBuzz" ; if ( isMultipleOf ( number , 3 )) return "Fizz" ; if ( isMultipleOf ( number , 5 )) return "Buzz" ; return Integer . toString ( number ); } private boolean isMultipleOf ( int number , int multiple ) { return number % multiple == 0 ; } } Fizzbuzzer.java

package biz . scalzo . tdd ; public class Fizzbuzzer { public String count ( int number ) { String fizzOrBuzz = fizz ( number ) + buzz ( number ); return fizzOrBuzz . equals ( "" ) ? Integer . toString ( number ) : fizzOrBuzz ; } private boolean isMultipleOf ( int number , int multiple ) { return number % multiple == 0 ; } private String fizz ( int number ) { return isMultipleOf ( number , 3 ) ? "Fizz" : "" ; } private String buzz ( int number ) { return isMultipleOf ( number , 5 ) ? "Buzz" : "" ; } } Fizzbuzzer.java

package biz . scalzo . tdd ; import junit . framework . Assert ; import org . junit . Test ; import biz . scalzo . tdd . Fizzbuzzer ; public class FizzbuzzTest { @Test public void testForOne (){ Assert . assertEquals ( "1" , new Fizzbuzzer (). count ( 1 )); } @Test public void testForTwo (){ Assert . assertEquals ( "2" , new Fizzbuzzer (). count ( 2 )); } @Test public void testForThree (){ Assert . assertEquals ( "Fizz" , new Fizzbuzzer (). count ( 3 )); } @Test public void testForFive (){ Assert . assertEquals ( "Buzz" , new Fizzbuzzer (). count ( 5 )); } @Test public void testForSix (){ Assert . assertEquals ( "Fizz" , new Fizzbuzzer (). count ( 6 )); } FizzbuzzTest.java

@Test public void testForSeven (){ Assert . assertEquals ( "7" , new Fizzbuzzer (). count ( 7 )); } @Test public void testForEight (){ Assert . assertEquals ( "8" , new Fizzbuzzer (). count ( 8 )); } @Test public void testForNine (){ Assert . assertEquals ( "Fizz" , new Fizzbuzzer (). count ( 9 )); } @Test public void testForTen (){ Assert . assertEquals ( "Buzz" , new Fizzbuzzer (). count ( 10 )); } @Test public void testForFifteen (){ Assert . assertEquals ( "FizzBuzz" , new Fizzbuzzer (). count ( 15 )); } } FizzbuzzTest.java

Bdd Way Test method names should be sentences

package biz . scalzo . bdd ; import java . util . ArrayList ; import java . util . List ; import org . junit . Test ; import static org . hamcrest . MatcherAssert . assertThat ; import static org . hamcrest . Matchers .*; public class AFizzbuzzer { @Test public void shouldYellOneForOne () { assertThat ( new Fizzbuzzer (). count ( 1 ), is ( equalTo ( "1" ))); } } AFizzbuzzer.java

Bdd Way the class should do something

@Test public void shouldYellTwoForTwo () { assertThat ( new Fizzbuzzer (). count ( 2 ), is ( equalTo ( "2" ))); } AFizzbuzzer.java

@Test public void shouldYellFizzForMultipleOfThree () { int [] fizzers = { 3 , 6 , 9 , 12 , 18 }; for ( int fizzer : fizzers ) { assertThat ( new Fizzbuzzer (). count ( fizzer ), is ( equalTo ( "Fizz" ))); } } AFizzbuzzer.java

@Test public void shouldYellBuzzForMultipleOfFive () { int [] buzzers = { 5 , 10 }; for ( int buzzer : buzzers ) { assertThat ( new Fizzbuzzer (). count ( buzzer ), is ( equalTo ( "Buzz" ))); } } AFizzbuzzer.java

@Test public void shouldYellFizzBuzzForMultipleOfThreeAndFive () { int [] fizzBuzzers = { 15 , 30 , 45 , 60 }; for ( int fizzBuzzer : fizzBuzzers ) { assertThat ( new Fizzbuzzer (). count ( fizzBuzzer ), is ( equalTo ( "FizzBuzz" ))); } } AFizzbuzzer.java

@Test public void shouldYellTheNumberForNotMultipleOfThreeOrFive () { for ( int plainNumber : plainNumbers ()) { assertThat ( new Fizzbuzzer (). count ( plainNumber ), is ( equalTo ( Integer . toString ( plainNumber )))); } } private List < Integer > plainNumbers () { List < Integer > numbers = new ArrayList < Integer >(); for ( int i = 1 ; i <= 100 ; i ++) numbers . add ( i ); for ( int i = 1 ; i < 35 ; i ++) numbers . remove ( new Integer ( i * 3 )); for ( int i = 1 ; i < 25 ; i ++) numbers . remove ( new Integer ( i * 5 )); return numbers ; } AFizzbuzzer.java

$ :. unshift File . join ( File . dirname ( __FILE__ ), *% w [.. lib ]) require "fizzbuzzer" describe "Fizzbuzzer" do it "should yell one for one" do Fizzbuzzer . new . count ( 1 ). should == '1' end end fizzbuzzer_spec.rb

it "should yell two for two" do Fizzbuzzer . new . count ( 2 ). should == '2' end fizzbuzzer_spec.rb

it "should yell Fizz for three" do Fizzbuzzer . new . count ( 3 ). should == 'Fizz' end fizzbuzzer_spec.rb

it "should yell Fizz for multiple of three" do [ 3 , 6 , 9 , 12 ]. each do | number | Fizzbuzzer . new . count ( number ). should == 'Fizz' end end fizzbuzzer_spec.rb

it "should yell Buzz for multiple of five" do [ 5 , 10 ]. each do | number | Fizzbuzzer . new . count ( number ). should == 'Buzz' end end fizzbuzzer_spec.rb

it "should yell FizzBuzz for multiple of three and five" do [ 15 , 30 , 45 ]. each do | number | Fizzbuzzer . new . count ( number ). should == 'FizzBuzz' end end fizzbuzzer_spec.rb

it "should yell the number itself for non multiple of three or five" do ( 1 . .100 ). select { | n | n % 3 != 0 && n % 5 != 0 }. each do | number | Fizzbuzzer . new . count ( number ). should == number . to_s end end fizzbuzzer_spec.rb

class Fixnum def fizzbuzzed ? "FizzBuzz" if self % 3 == 0 && self % 5 == 0 end def fizzed ? "Fizz" if self % 3 == 0 end def buzzed ? "Buzz" if self % 5 == 0 end end class Fizzbuzzer def count ( number ) number . fizzbuzzed ? || number . fizzed ? || number . buzzed ? || number . to_s end end fizzbuzzer.rb

describe "Fizzbuzzer" do it "should yell one for one" do Fizzbuzzer . new . count ( 1 ). should == '1' end it "should yell two for two" do Fizzbuzzer . new . count ( 2 ). should == '2' end it "should yell Fizz for multiple of three" do [ 3 , 6 , 9 , 12 ]. each do | number | Fizzbuzzer . new . count ( number ). should == 'Fizz' end end it "should yell Buzz for multiple of five" do [ 5 , 10 ]. each do | number | Fizzbuzzer . new . count ( number ). should == 'Buzz' end end it "should yell FizzBuzz for multiple of three and five" do [ 15 , 30 , 45 ]. each do | number | Fizzbuzzer . new . count ( number ). should == 'FizzBuzz' end end it "should yell the number itself for non multiple of three or five" do ( 1 . .100 ). select { | n | n % 3 != 0 && n % 5 != 0 }. each do | number | Fizzbuzzer . new . count ( number ). should == number . to_s end end end fizzbuzzer_spec.rb

As a [role] I want [feature] So that [benefit] Story

Scenario 1: Title Given [context] And [some more context]... When [event] Then [outcome] And [another outcome] Scenario Acceptance Criteria

Cucumber fizzbuzzer.feature fizzbuzzer_steps.rb

Feature : perfect fizzbuzzing As a inattentive counter I want an automatic Fizzbuzzer So that I can win Fizzbuzz Championsip fizzbuzzer.feature

Scenario : manage fizz numbers Given a Fizzbuzzer When I ask for a multiple of 3 Then Fizzbuzzer yells 'Fizz' fizzbuzzer.feature

require "fizzbuzzer" Given "a Fizzbuzzer" do @fizzbuzzer = Fizzbuzzer . new end When "I ask for a multiple of $m" do | m | @result = [ 1 , 2 ]. map { | base | @fizzbuzzer . count ( base * eval ( m ). to_i ) } end Then "Fizzbuzzer yells '$yell'" do | yell | @result . each do | result | result . should == yell end end fizzbuzzer_steps.rb

Scenario : manage buzz numbers Given a Fizzbuzzer When I ask for a multiple of 5 Then Fizzbuzzer yells 'Buzz' Scenario : manage fizzbuzz numbers Given a Fizzbuzzer When I ask for a multiple of 3 * 5 Then Fizzbuzzer yells 'FizzBuzz' fizzbuzzer.feature

Scenario : manage plain numbers Given a Fizzbuzzer When I ask for a plain number Then Fizzbuzzer yells the number itself fizzbuzzer.feature

When "I ask for a plain number" do @expected = ( 1 . .100 ). select { | n | n % 3 != 0 && n % 5 != 0 } @result = @expected . each do | number | @fizzbuzzer . count ( number ). to_i end end Then "Fizzbuzzer yells the number itself" do @result . should == @expected end fizzbuzzer_steps.rb

Scenario Outline : manage plain numbers Given a Fizzbuzzer When I ask for '<number>' Then Fizzbuzzer yells '<result>' Examples : | number | result | | 1 | 1 | | 2 | 2 | | 3 | Fizz | | 4 | 4 | | 5 | Buzz | | 6 | Fizz | fizzbuzzer.feature

jbehave manage_fizzbuzzer ManageFizzbuzzer.java ManageFizzbuzzerSteps.java

Feature : perfect fizzbuzzing As a inattentive counter I want an automatic Fizzbuzzer So that I can win Fizzbuzz Championsip Scenario : manage fizz numbers Given a Fizzbuzzer When I ask for a multiple of 3 Then Fizzbuzzer yells 'Fizz' Scenario : manage buzz numbers Given a Fizzbuzzer When I ask for a multiple of 5 Then Fizzbuzzer yells 'Buzz' Scenario : manage fizzbuzz numbers Given a Fizzbuzzer When I ask for a multiple of 15 Then Fizzbuzzer yells 'FizzBuzz' manage_fizzbuzzer

Scenario : manage plain numbers Given a Fizzbuzzer When I ask for a plain number Then Fizzbuzzer yells the number itself Scenario : manage plain numbers Given a Fizzbuzzer When I ask for '[number]' Then Fizzbuzzer yells '[yell]' Examples : | number | yell | | 1 | 1 | | 2 | 2 | | 3 | Fizz | | 4 | 4 | | 5 | Buzz | | 6 | Fizz | manage_fizzbuzzer

package biz . scalzo . jbehave ; import org . jbehave . scenario . Scenario ; public class ManageFizzbuzzer extends Scenario { public ManageFizzbuzzer () { super ( new ManageFizzbuzzerSteps ()); } } ManageFizzbuzzer.java

import biz . scalzo . bdd . Fizzbuzzer ; public class ManageFizzbuzzerSteps extends Steps { private Fizzbuzzer fizzbuzzer ; private List < String > results ; private List < String > expected ; private String result ; @BeforeScenario public void setUp () { expected = new ArrayList < String >(); results = new ArrayList < String >(); } ManageFizzbuzzerSteps.java

@ Given ( "a Fizzbuzzer" ) public void startFizzbuzzer () { fizzbuzzer = new Fizzbuzzer (); } @ When ( "I ask for a multiple of $divisor" ) public void askForMultipleOf ( int divisor ) { for ( int number = 1 ; number < 3 ; ++ number ) results . add ( fizzbuzzer . count ( number * divisor )); } @ Then ( "Fizzbuzzer yells '$yell'" ) public void checkYell ( String yell ) { for ( String result : results ) { assertThat ( result , is ( equalTo ( yell ))); } } ManageFizzbuzzerSteps.java

@ When ( "I ask for a plain number" ) public void askForPlainNumbers () { for ( int i = 1 ; i <= 100 ; i ++) if ( i % 3 != 0 && i % 5 != 0 ) expected . add ( Integer . toString ( i )); for ( String number : expected ) results . add ( fizzbuzzer . count ( Integer . parseInt ( number ))); } @ Then ( "Fizzbuzzer yells the number itself" ) public void yellsNumberItself () { for ( int i = 0 ; i < expected . size (); i ++) { assertThat ( results . get ( i ), is ( equalTo ( expected . get ( i )))); } } ManageFizzbuzzerSteps.java

@ When ( "I ask for '[number]'" ) public void askFor ( @ Named ( "number" ) int number ) { result = fizzbuzzer . count ( number ); } @ Then ( "Fizzbuzzer yells '[yell]'" ) public void checkResult ( @ Named ( "yell" ) String yell ) { assertThat ( result , is ( equalTo ( yell ))); } ManageFizzbuzzerSteps.java

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http://github.com/coreyhaines/ practice_game_of_life

Feature: Evolving a living cell In order to create a functioning rules engine As a programmer of Conway's Game of Life I can evolve a single living cell Scenario: Living cell with 0 neighbors dies Given the following setup | . | . | . | | . | x | . | | . | . | . | When I evolve the board Then the center cell should be dead Scenario: Living cell with 1 neighbor dies Given the following setup | . | x | . | | . | x | . | | . | . | . | When I evolve the board Then the center cell should be dead Scenario: Living cell with 2 neighbors lives Given the following setup | . | x | . | | . | x | x | | . | . | . | When I evolve the board Then the center cell should be alive Scenario: Living cell with 3 neighbors lives Given the following setup | x | x | x | | . | x | . | | . | . | . | When I evolve the board Then the center cell should be alive

Bdd: Tdd and beyond the infinite

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Bdd: Tdd and beyond the infinite

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