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The Pros of Behavior Driven Development (BDD): Business User Scenarios Natalya Zaytseva Exactpro Systems LLC

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Test Driven Development (TDD) Test Failed Add a test Test Passed Update the code Refactor

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Test Driven Development (TDD) <ul><li>Benefits </li></ul><ul><li>Unit tests prove that code actually works </li></ul><ul><li>Refactoring allows to improve the design of the code </li></ul><ul><li>Low-level regression test suite </li></ul><ul><li>Test-first reduces the cost of bugs </li></ul><ul><li>Drawbacks </li></ul><ul><li>Developers can consider it as a waste of time </li></ul><ul><li>Anticipation by developers the concept of “Testing” </li></ul><ul><li>The tests can be targeted on verification of classes and methods and not on what the code really should do </li></ul>

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Behavior Driven Development (BDD) <ul><li>Shifting from thinking in “tests” to thinking in “behavior” </li></ul><ul><li>Collaboration between Business stakeholders, Business Analysts, QA team and Developers </li></ul><ul><li>Ubiquitous language </li></ul><ul><li>. </li></ul>

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Behavior Driven Development (BDD) <ul><li>Approach </li></ul>a feature4 QA Analyst Ubiquitous language Behavior feature1 feature3 QA Analyst Scenarios Class Developer

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BDD: Business Scenarios <ul><ul><li>Story: [Narrative] </li></ul></ul><ul><ul><li>As a Role </li></ul></ul><ul><ul><li>I request a Feature </li></ul></ul><ul><ul><li>To gain a Benefit </li></ul></ul><ul><ul><li>Scenario </li></ul></ul><ul><ul><li>Given [context] </li></ul></ul><ul><ul><li>AND [some more context] </li></ul></ul><ul><li>When [Event] </li></ul><ul><li>Then [Outcome] </li></ul><ul><li>And [Another Outcome] </li></ul>

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BDD Cons Ivan Bobrov EXTENT October 2011

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The Beginning

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Is it easy to describe? <ul><li>Scenario: An Artist creates an art work Given I am a registered artist And I am on my dashboard And I follow &quot;Add an artwork&quot; within &quot;#dashboard&quot; When I fill in &quot;Title&quot; with &quot;The Portrait&quot; And I fill in &quot;Description&quot; with &quot;A nice portrait.&quot; And I select &quot;Painting&quot; from &quot;Category&quot; And I attach “ portret .jpg&quot; to &quot;Select picture&quot; And I press &quot;Create&quot; Then I should see &quot;The Portrait &quot; was successfully added to your art collection </li></ul>

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A Client and BDD is Face to Face <ul><li>With every new project I hoped that Cucumber can become one of the communication tools between our team and the customer. Only once I managed to get the customer write the scenarios , however the quality wasn't good and they had to be rewritten by a developer </li></ul><ul><li>It was difficult to convince the customer to review the scenarios on a daily basis . They preferred writing a document or using a ticketing system like Redmine. The result is that we have requirements in 2 places - tickets and scenarios </li></ul><ul><li>Andrzej Krzywda </li></ul>

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Are developers ready for BDD? <ul><li>A developer often writes specifications </li></ul><ul><li>Specs are very detailed </li></ul><ul><li>Scripts, scenarios or a manual? </li></ul><ul><li>Easy to understand </li></ul>

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BDD doesn’t show a real life <ul><li>In BBD Scenario NewOrderSingle where SecurityID=S1 and Price=P1 and Side=BUY and Quantity=Q1 … </li></ul><ul><li>In Real Life </li></ul><ul><li>Initialize TCP connection </li></ul><ul><li>Send Logon to the GW </li></ul><ul><li>Wait for Logon response </li></ul><ul><li>Start sending HeartBeats </li></ul><ul><li>Send NewOrderSingle with …. </li></ul>

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Release <ul><li>A Product is ready to use </li></ul><ul><li>BDD it’s a design tool </li></ul>

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1770 year

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2011 year

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<ul><li>Thank you. </li></ul>