How to Tame TDD

TDD is one of the most controversial subjects in the software industry. Its promises are many: a codebase that continuously checks itself, reduces maintainability costs, simplifies introduction of changes, and allows faster work cycles. Unfortunately, high expectations lead to high disappointments. Many good teams have found themselves enchained in webs of mock objects that not only hindered every promise made by TDD originally, but were more costly to maintain than the codebase itself! No wonder why TDD has been declared as waste by many respected professionals. Heck, I was hit by TDD's dark side myself... but found a way to slay the complexity dragon. In this session I'm going to share what I've learned the hard way: how to make peace with mock objects, how to avoid accidental complexities, and ultimately, how to make TDD work for you.

Transcript

1. 16 – 17 November, Sofia ISTACON.ORG How to Tame TDD By Vladik Khononov
2. 16 – 17 November, Sofia ISTACON.ORG My twitter is I blog Chief Architect My email is vladik
 @ vladikk @ vladikk.com @ Naxex @ khononov.com

3. 16 – 17 November, Sofia ISTACON.ORG
4. 16 – 17 November, Sofia ISTACON.ORG Agenda TDD Journey Fix #1: Scoping Unit Tests Fix #2: Testing Strategies Common misconceptions Fix #3: TDD & Design TDD Revisited Cyclomatic Complexity Business Logic Modeling Patterns
5. 16 – 17 November, Sofia ISTACON.ORG
6. 16 – 17 November, Sofia ISTACON.ORG
7. 16 – 17 November, Sofia ISTACON.ORG • TDD?
8. 16 – 17 November, Sofia ISTACON.ORG • TDD? • Done TDD?
9. 16 – 17 November, Sofia ISTACON.ORG • TDD? • Done TDD? • Still doing TDD?
10. 16 – 17 November, Sofia ISTACON.ORG Our TDD Journey
11. 16 – 17 November, Sofia ISTACON.ORG TDD
12. 16 – 17 November, Sofia ISTACON.ORG
13. 16 – 17 November, Sofia ISTACON.ORG v1
14. 16 – 17 November, Sofia ISTACON.ORG v1
15. 16 – 17 November, Sofia ISTACON.ORG v1
16. 16 – 17 November, Sofia ISTACON.ORG v1 v2 UNIT
 TESTS
17. 16 – 17 November, Sofia ISTACON.ORG
18. 16 – 17 November, Sofia ISTACON.ORG
19. 16 – 17 November, Sofia ISTACON.ORG
20. 16 – 17 November, Sofia ISTACON.ORG v1 v2 UNIT
 TESTS
21. 16 – 17 November, Sofia ISTACON.ORG v1 v2 UNIT
 TESTS
22. 16 – 17 November, Sofia ISTACON.ORG v1 v2 v5 OH SHIT!
23. 16 – 17 November, Sofia ISTACON.ORG v1 v2 v5 OH SHIT!
24. 16 – 17 November, Sofia ISTACON.ORG v1 v2 v5 OH SHIT!
25. 16 – 17 November, Sofia ISTACON.ORG Test Code
26. 16 – 17 November, Sofia ISTACON.ORG Fixing failed tests Test Code
27. 16 – 17 November, Sofia ISTACON.ORG v1 v2 v5 OH SHIT!
28. 16 – 17 November, Sofia ISTACON.ORG v5 v1 v2 OH SHIT!
29. 16 – 17 November, Sofia ISTACON.ORG v5 v1 v2
30. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test
31. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test
32. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test Fakes Mocks Stubs
33. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test • Refactor Fakes Mocks Stubs
34. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test • Refactor Fakes Mocks Stubs
35. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test • Refactor • Repeat • 100% unit test coverage • Maintainable and extendable code • FAST!!! Fakes Mocks Stubs
36. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test • Refactor • Repeat • 100% unit test coverage • Maintainable and extendable code • FAST!!! Fakes Mocks Stubs
37. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test • Refactor • Repeat • 100% unit test coverage • Maintainable and extendable code • FAST!!! Fakes Mocks Stubs
38. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test • Refactor • Repeat • 100% unit test coverage • Maintainable and extendable code • FAST!!! Fakes Mocks Stubs TEST-DRIVEN DESIGN
39. 16 – 17 November, Sofia ISTACON.ORG Fakes Mocks Stubs • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test • Refactor • Repeat • 100% unit test coverage • Maintainable and extendable code • FAST!!! TEST-DRIVEN DESIGN
40. 16 – 17 November, Sofia ISTACON.ORG Fakes Mocks Stubs • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test • Refactor • Repeat • 100% unit test coverage • Maintainable and extendable code • FAST!!! TEST-DRIVEN DESIGN
41. 16 – 17 November, Sofia ISTACON.ORG Fakes Mocks Stubs • Write a failing Unit Test • Write code to a make it pass • Proper design • Isolate the Class under test • Refactor • Repeat • 100% unit test coverage • Maintainable and extendable code • FAST!!! TEST-DRIVEN DESIGN
42. 16 – 17 November, Sofia ISTACON.ORG What is a Unit?
43. 16 – 17 November, Sofia ISTACON.ORG CLASS?
44. 16 – 17 November, Sofia ISTACON.ORG
45. 16 – 17 November, Sofia ISTACON.ORG •OOP Only CLASS?
46. 16 – 17 November, Sofia ISTACON.ORG •OOP Only •Fragile CLASS?
47. 16 – 17 November, Sofia ISTACON.ORG Unit
48. 16 – 17 November, Sofia ISTACON.ORG Mock Stub Mock Stub Stub Stub Unit
49. 16 – 17 November, Sofia ISTACON.ORG
50. 16 – 17 November, Sofia ISTACON.ORG
51. 16 – 17 November, Sofia ISTACON.ORG
52. 16 – 17 November, Sofia ISTACON.ORG •OOP Only •Fragile •No! CLASS?
53. 16 – 17 November, Sofia ISTACON.ORG ” “ A unit is a single logical functional use case in the system that can be invoked by some
 public interface… A unit can span a single method, a whole class or multiple classes working together to achieve one single logical purpose Roy Osherove The Art of Unit Testing
54. 16 – 17 November, Sofia ISTACON.ORG
55. 16 – 17 November, Sofia ISTACON.ORG List Task Status * 1
56. 16 – 17 November, Sofia ISTACON.ORG Task List Status Units
57. 16 – 17 November, Sofia ISTACON.ORG Task List Status Units
58. 16 – 17 November, Sofia ISTACON.ORG Create a new list Create a new task Mark as completed Update list name Units
59. 16 – 17 November, Sofia ISTACON.ORG Unit Test: Create a new task List Task Status
60. 16 – 17 November, Sofia ISTACON.ORG Unit Test: Create a new task List Task Status Database Online Calendar Isolate External systems
61. 16 – 17 November, Sofia ISTACON.ORG • Align Units with the system’s use cases • Do not isolate implementation details • Isolate external systems and services Adjustment #1
62. 16 – 17 November, Sofia ISTACON.ORG Why Unit Tests?
63. 16 – 17 November, Sofia ISTACON.ORG Unit Tests Integration Tests End to End Tests
64. 16 – 17 November, Sofia ISTACON.ORG Number of tests * Execution time = Feedback time
65. 16 – 17 November, Sofia ISTACON.ORG
66. 16 – 17 November, Sofia ISTACON.ORG
67. 16 – 17 November, Sofia ISTACON.ORG * Execution time = Feedback time Number of tests
68. 16 – 17 November, Sofia ISTACON.ORG * Execution time = Feedback time Number of tests
69. 16 – 17 November, Sofia ISTACON.ORG public User(long id, Agency agency, User createdBy, DateTime createdOn) : base(createdBy, createdOn) { this.Id = id; this.agency = agency; this.AutoLeadAssignmentPausedUntil = DateTime.UtcNow; } public User(Agency agency, User createdBy, DateTime createdOn) : base(createdBy, createdOn) { this.agency = agency; this.AutoLeadAssignmentPausedUntil = DateTime.UtcNow; } public virtual void AddGroup(Group group) { RemoveGroupsWithOtherDesks(group.Desk); groups.AddIfNotExists(group); if (!group.Users.Contains(this)) group.AddUser(this, false); } public virtual void SetActive(bool value) { if (value && !this.Active) this.StatisticsShouldBeRecalculated = true; this.Active = value; } private void RemoveGroupsWithOtherDesks(Desk newDesk) { if (newDesk == Desk) return; foreach (var g in groups) g.RemoveUser(this); groups.Clear(); } public virtual void AddOrganizationUnit(OrganizationUnitUserAssociation ouUserAssociation) { if (organizationUnitsAssociations.All(x => x.Unit.Id != ouUserAssociation.Unit.Id)) organizationUnitsAssociations.Add(ouUserAssociation); } public virtual Desk[] GetManagedDesks(Advertiser advertiser) { return this.CanAccessAllDesks ? advertiser.Desks.ToArray() : this.ManagesDesks.ToArray(); } public virtual Group[] GetManagedGroups(Advertiser advertiser) { return this.CanAccessAllDesks ? advertiser.Desks.SelectMany(x => x.Groups).Distinct().ToArray() : GetManagedDesks(advertiser) .SelectMany(x => x.Groups) .Concat(this.Groups.Where(x => x.IsManagedBy(this))) .Distinct() .ToArray(); } public virtual Advertiser[] GetAllowedAdvertisers()
70. 16 – 17 November, Sofia ISTACON.ORG Number of independent execution paths within a section of code Cyclomatic Complexity
71. 16 – 17 November, Sofia ISTACON.ORG DoSomething DoSomethingElse ExecuteSomething ExecuteSomethingElse Low C. Complexity
72. 16 – 17 November, Sofia ISTACON.ORG if(SomeCondition()) DoSomething(); else DoSomethingElse(); if(AnotherCondition()) ExecuteSomething(); else ExecuteSomethingElse(); High C. Complexity
73. 16 – 17 November, Sofia ISTACON.ORG Cyclomatic
 Complexity Amount
 of Tests
74. 16 – 17 November, Sofia ISTACON.ORG M = E − N + 2P M = E − N + 2 M = π − s + 2
75. 16 – 17 November, Sofia ISTACON.ORG
76. 16 – 17 November, Sofia ISTACON.ORG Cyclomatic
 Complexity Amount
 of Tests
77. 16 – 17 November, Sofia ISTACON.ORG Business Logic Modeling Patterns
78. 16 – 17 November, Sofia ISTACON.ORG Transaction Script Active Record Domain Model Business Logic Modeling Patterns
79. 16 – 17 November, Sofia ISTACON.ORG Simple logic Extract, Transform and Load Procedural code Transaction Script
80. 16 – 17 November, Sofia ISTACON.ORG JSON XML JSON2XML
81. 16 – 17 November, Sofia ISTACON.ORG Source Database IMPORT
82. 16 – 17 November, Sofia ISTACON.ORG DB.StartTransaction(); var job = DB.LoadNextJob();
 var json = LoadFile(source); var xml = ConvertJsonToXml(json); WriteFile(destionation, xml.ToString(); DB.MarkJobAsCompleted(job); DB.Commit()
83. 16 – 17 November, Sofia ISTACON.ORG Simple logic ETL-Like processes Procedural code Transaction Script
84. 16 – 17 November, Sofia ISTACON.ORG Unit INTEGRATION END2END
85. 16 – 17 November, Sofia ISTACON.ORG Complex data structures Simple logic CRUD Active Record
86. 16 – 17 November, Sofia ISTACON.ORG Advertiser Ad Campaign Placement * 1 * Location Website Creatives *
87. 16 – 17 November, Sofia ISTACON.ORG Complex data structures Simple logic CRUD Active Record
88. 16 – 17 November, Sofia ISTACON.ORG
89. 16 – 17 November, Sofia ISTACON.ORG Active Record Presentation Layer Active Records Service / Application Layer Data Structures Business Logic
90. 16 – 17 November, Sofia ISTACON.ORG public class User { public Guid Id { get; set; }
 public string Name { get; set; }
 public List<Interest> Interests { get; set; }
 public Address Address { get; set; } public void Save() { … }
 public void Delete() { … }
 public static User Get(Guid id) { … }
 public static List<User> GetAll() { … } }
91. 16 – 17 November, Sofia ISTACON.ORG Active Record Presentation Layer Service / Application Layer Active Records Data Structures Business Logic
92. 16 – 17 November, Sofia ISTACON.ORG public class CreateUser { public void Execute(userDetails) { try { DB.StartTransaction();
 var user = new User();
 user.Name = userDetails.Name;
 user.Email = userDetails.Email;
 user.Save();
 DB.Commit(); } catch { DB.Rollback();
 throw; } } }
93. 16 – 17 November, Sofia ISTACON.ORG public class User { public Guid Id { get; set; }
 public string Name { get; set; }
 public List<Interest> Interests { get; set; }
 public Address Address { get; set; } public void Save() { … }
 public void Delete() { … }
 public static User Get(Guid id) { … }
 public static List<User> GetAll() { … } }
94. 16 – 17 November, Sofia ISTACON.ORG public class CreateUser { public void Execute(userDetails) { try { DB.StartTransaction();
 var user = new User();
 user.Name = userDetails.Name;
 user.Email = userDetails.Email;
 user.Save();
 DB.Commit(); } catch { DB.Rollback();
 throw; } } }
95. 16 – 17 November, Sofia ISTACON.ORG INTEGRATION E2E UNIT
96. 16 – 17 November, Sofia ISTACON.ORG Complex logic Business rules Protecting invariants Domain Model
97. 16 – 17 November, Sofia ISTACON.ORG public class User { public Guid Id { get; private set; }
 public string Name { get; private set; }
 public List<Interest> Interests { get; private set; }
 public Address Address { get; private set; } public void UpdateDetails() { … }
 public void AddInterest() { … }
 public static User InitializeNew() { … } }
98. 16 – 17 November, Sofia ISTACON.ORG E2E INTEGRATION UNIT
99. 16 – 17 November, Sofia ISTACON.ORG Adjustment #2: Testing Strategies
100. 16 – 17 November, Sofia ISTACON.ORG • Transaction Script - 100% End to end Adjustment #2: Testing Strategies
101. 16 – 17 November, Sofia ISTACON.ORG • Transaction Script - 100% End to end • Active Record - 100% Integration tests Adjustment #2: Testing Strategies
102. 16 – 17 November, Sofia ISTACON.ORG • Transaction Script - 100% End to end • Active Record - 100% Integration tests • Domain Model - 100% Unit tests Adjustment #2: Testing Strategies
103. 16 – 17 November, Sofia ISTACON.ORG Design?
104. 16 – 17 November, Sofia ISTACON.ORG Well designed code is testable
105. 16 – 17 November, Sofia ISTACON.ORG Well designed code is testable Testable code is well designed
106. 16 – 17 November, Sofia ISTACON.ORG Well designed code is testable Testable code is well designed
107. 16 – 17 November, Sofia ISTACON.ORG Transaction Script Active Record Domain Model Business Logic Modeling Patterns
108. 16 – 17 November, Sofia ISTACON.ORG • System’s design is driven by its business domain, its needs and its problems • Development can be driven by tests Adjustment #3: Design vs. Development
109. 16 – 17 November, Sofia ISTACON.ORG • System’s design is driven by its business domain, its needs and its problems • Development can be driven by tests • Test-Driven Design • Test-Driven Development Adjustment #3: Design vs. Development
110. 16 – 17 November, Sofia ISTACON.ORG Taking Care of Tests
111. 16 – 17 November, Sofia ISTACON.ORG
112. 16 – 17 November, Sofia ISTACON.ORG AUTOMATED TESTS ARE PRODUCTION CODE
113. 16 – 17 November, Sofia ISTACON.ORG [TestMethod] public void SetAsUnqualified_ClearWeights() { var lead = BuildLead(10, 15, 24, false); lead.SetAsUnqualified(updatedContactDetails, policy, 12); Assert.AreEqual(12, lead.Proprity); }
114. 16 – 17 November, Sofia ISTACON.ORG [TestMethod] public void SetAsUnqualified_ClearWeights() { var lead = BuildLead(10, 15, 24, false); lead.SetAsUnqualified(updatedContactDetails, policy, 12); Assert.AreEqual(12, lead.Proprity); }
115. 16 – 17 November, Sofia ISTACON.ORG [TestMethod] public void SetAsUnqualified_ClearWeights() { var lead = BuildLead(someUserId, groupId, events, notNew); lead.SetAsUnqualified(updatedContactDetails, policy, agentId); Assert.AreEqual(newLeadPriority, lead.Proprity); }
116. 16 – 17 November, Sofia ISTACON.ORG [TestMethod] public void CreateLeadActivity_CreateValidJSON() { var depositActivity = new DepositActivity(); depositActivity.ActivityTypeId = 6002; depositActivity.AdvertiserActivityTypeId = 3; depositActivity.ActivityDescription = "Deposit-Approved"; depositActivity.AdvertiserId = 1; depositActivity.AgencyId = 23; depositActivity.BrandId = 1; depositActivity.CustomerId = "eyookon93@yahoo.com"; depositActivity.CreatedDate = new DateTime(2015, 03, 23, 9, 30, 42); depositActivity.Domain = "deposit.23traders.com"; depositActivity.LabelId = 1; depositActivity.TransactionId = 25; depositActivity.CreatedDateStr = "2015-03-23T09:30:42+00:00"; var leadActivityDTo = new LeadActivityDTO(depositActivity, false); var serializeObject = new JsonNetAdapter().SerializeObject(leadActivityDTo); A.CallTo(() => jsonSerializer.SerializeObject(leadActivityDTo)).WithAnyArguments().Returns(serializeObject); var result = new DepositActivityFactory(jsonSerializer).CreateLeadActivity(depositActivity); Assert.AreEqual(result, leadActivityJSON); }
117. 16 – 17 November, Sofia ISTACON.ORG Gherkin Language • Given • When • Then
118. 16 – 17 November, Sofia ISTACON.ORG [TestMethod] public void CreateLeadActivity_CreateValidJSON() { var depositActivity = new DepositActivity(); depositActivity.ActivityTypeId = 6002; depositActivity.AdvertiserActivityTypeId = 3; depositActivity.ActivityDescription = "Deposit-Approved"; depositActivity.AdvertiserId = 1; depositActivity.AgencyId = 23; depositActivity.BrandId = 1; depositActivity.CustomerId = "eyookon93@yahoo.com"; depositActivity.CreatedDate = new DateTime(2015, 03, 23, 9, 30, 42); depositActivity.Domain = "deposit.23traders.com"; depositActivity.LabelId = 1; depositActivity.TransactionId = 25; depositActivity.CreatedDateStr = "2015-03-23T09:30:42+00:00"; var leadActivityDTo = new LeadActivityDTO(depositActivity, false); var serializeObject = new JsonNetAdapter().SerializeObject(leadActivityDTo); A.CallTo(() => jsonSerializer.SerializeObject(leadActivityDTo)).WithAnyArguments().Returns(serializeObject); var result = new DepositActivityFactory(jsonSerializer).CreateLeadActivity(depositActivity); Assert.AreEqual(result, leadActivityJSON); }
119. 16 – 17 November, Sofia ISTACON.ORG Scenario: Check monthly report Given today is 2015/05/18 And a payment was made for the 2015/04 period on 2015/04/01 When we generate agent's monthly report for 2015/03 Then payment log cannot be generated And the payment log was generated on 2015/04/01
120. 16 – 17 November, Sofia ISTACON.ORG Jasmine (JavaScript) SpecFlow (.Net) Behave (Python) Cucumber (Ruby) etc
121. 16 – 17 November, Sofia ISTACON.ORG Examples
122. 16 – 17 November, Sofia ISTACON.ORG public virtual void SetAsConverted(…) { UpdateContactDetails(updatedContactDetails.Name); var waitDaysForDeposit = Settings.GetAppConfigInt("Days"); ClearWeights(); TrackPhoneCall(phoneNumber, convertedBy, convertedOn); ResetInteraction(); UpdateModifiedByAndOn(convertedBy.Id, convertedOn); Apply(new DepositPending(State.Id, interactionId)); } C.Complexity: Low or High?
123. 16 – 17 November, Sofia ISTACON.ORG public virtual void SetAsConverted(…) { UpdateContactDetails(updatedContactDetails.Name); var waitDaysForDeposit = Settings.GetAppConfigInt("Days"); ClearWeights(); TrackPhoneCall(phoneNumber, convertedBy, convertedOn); ResetInteraction(); UpdateModifiedByAndOn(convertedBy.Id, convertedOn); Apply(new DepositPending(State.Id, interactionId)); } Unit Test or Integration Test?
124. 16 – 17 November, Sofia ISTACON.ORG Active Record or Domain Model? You are working on a CRM system, and you are asked to build a service that calculates commissions for sales agents. There about 100 different commissions rules, and managers should be able to optimize them on the fly.
125. 16 – 17 November, Sofia ISTACON.ORG Full Coverage by Unit or Integration Tests? You are asked to build a service that calculates commissions for sales agents. There are about 100 different commissions rules, and managers should be able to optimize them on the fly.
126. 16 – 17 November, Sofia ISTACON.ORG Active Record or Domain Model?
127. 16 – 17 November, Sofia ISTACON.ORG Full Coverage by Integration or Unit Tests?
128. 16 – 17 November, Sofia ISTACON.ORG Summary
129. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Simplest design • Isolate the Class under test • Refactor • Repeat • 100% unit test coverage • Maintainable and extendable code • FAST!!! Fakes Mocks Stubs TEST-DRIVEN DESIGN
130. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Simplest design • Refactor • Repeat • 100% unit test coverage • FAST!!! Fakes Mocks Stubs TEST-DRIVEN DESIGN • Isolate the Class under test • Maintainable and extendable code
131. 16 – 17 November, Sofia ISTACON.ORG • Write a failing Unit Test • Write code to a make it pass • Simplest design • Refactor • Repeat • 100% unit test coverage • FAST!!! TEST-DRIVEN DESIGN
132. 16 – 17 November, Sofia ISTACON.ORG • Write code to a make it pass • Simplest design • Refactor • Repeat • FAST!!! TEST-DRIVEN DESIGN • Write a failing Unit Test • 100% unit test coverage
133. 16 – 17 November, Sofia ISTACON.ORG • Write code to a make it pass • Simplest design • Refactor • Repeat • FAST!!! TEST-DRIVEN DESIGN • 100% unit test coverage
134. 16 – 17 November, Sofia ISTACON.ORG • Write code to a make it pass • Simplest design • Refactor • Repeat • FAST!!! TEST-DRIVEN DESIGN
135. 16 – 17 November, Sofia ISTACON.ORG • Write code to a make it pass • Simplest design • Refactor • Repeat • FAST!!! TEST-DRIVEN DESIGN
136. 16 – 17 November, Sofia ISTACON.ORG • Write code to a make it pass
 • Repeat
 
 
 TEST-DRIVEN • Simplest design • Refactor • Fast DESIGN
137. 16 – 17 November, Sofia ISTACON.ORG • Write code to a make it pass
 • Repeat
 
 
 TEST-DRIVEN • Refactor • Fast DESIGN
138. 16 – 17 November, Sofia ISTACON.ORG • Write code to a make it pass
 • Repeat
 
 
 TEST-DRIVEN • Fast DESIGN
139. 16 – 17 November, Sofia ISTACON.ORG • Write code to a make it pass
 • Repeat
 
 
 TEST-DRIVEN DESIGN
140. 16 – 17 November, Sofia ISTACON.ORG • Write code to a make it pass
 • Repeat
 
 
 TEST-DRIVEN
141. 16 – 17 November, Sofia ISTACON.ORG TDD Rebooted
142. 16 – 17 November, Sofia ISTACON.ORG TEST-DRIVEN DEVELOPMENT
143. 16 – 17 November, Sofia ISTACON.ORG • Learn the business domain • Analyze • Assess its complexity TEST-DRIVEN DEVELOPMENT
144. 16 – 17 November, Sofia ISTACON.ORG • Learn the business domain • Analyze • Assess its complexity • Design the solution • Business logic modeling pattern • Testing strategy TEST-DRIVEN DEVELOPMENT
145. 16 – 17 November, Sofia ISTACON.ORG • Learn the business domain • Analyze • Assess its complexity • Design the solution • Business logic modeling pattern • Testing strategy • Development • Start with a failing test (according to the testing strategy) • Make it pass • Refactor TEST-DRIVEN DEVELOPMENT
146. 16 – 17 November, Sofia ISTACON.ORG P.S.
147. 16 – 17 November, Sofia ISTACON.ORG
148. 16 – 17 November, Sofia ISTACON.ORG Thank you! @vladikk vladikk.com Vladik Khononov vladik@khononov.com