BDD overview - Speaker Deck

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©1993 – 2018 Scrum.org All Rights Reserved Let’s Talk… Proud Member: The Professional Agile Partnership SMOOTHAPPS 972-948-3151 [email protected] Ravi Verma The Org Whisperer BDD Class: Dec 13 – 14 2018

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©1993 – 2018 Scrum.org All Rights Reserved What’s the costliest problem with software? q Bugs q Users don’t use part of the product q Developers are highly paid q QA takes an unpredictable amount of time q Requirements are misunderstood q Technology is ever changing

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©1993 – 2018 Scrum.org All Rights Reserved The application 13 You are writing a the blue light special app When people are running the app and connected to the store Wifi, The store can activate a “blue light special” deal message that is active for a pre- determined amount of time The deal can be active for a maximum of 15 minutes The deal message is short - 500 characters

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©1993 – 2018 Scrum.org All Rights Reserved Quick think of a story for this application 14 Story As a store advertising manager I want to send out a blue light special to customers connected to the store wifi So they are encouraged to use the store wifi Acceptance criteria Special messages are <= 500 characters Messages only go to connected customers Messages are active a maximum of 15 minutes Title Body As a < role > I want to < do something > So that < I get business value > Acceptance criteria

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©1993 – 2018 Scrum.org All Rights Reserved When a customer is connected to the wifi they will not receive a blue light message Write some concrete examples Customer Joe is connected to the store wifi When a blue light special with the message “dog food 15% off” is sent Joe will see the message “dog food 15% off” Here’s an example Here’s a concrete example

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©1993 – 2018 Scrum.org All Rights Reserved When a customer isn’t connected to the wifi they will not receive a blue light message Write some concrete examples Customer Joe is not connected to the store wifi When a blue light special with the message “dog food 15% off” is sent Joe will not see the message Here’s an example Here’s a concrete example

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©1993 – 2018 Scrum.org All Rights Reserved If a customer becomes connected to the wifi, the customer will receive messages as long as they were sent no more than 15 seconds before the connection occurred Write some concrete examples A blue light special with the message “dog food 15% off” is sent Customer Joe becomes connected to the store wifi Then Joe will see (ask the PO) Here’s rule Here’s a concrete example

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©1993 – 2018 Scrum.org All Rights Reserved If a customer becomes disconnected to the wifi while receiving a message the message will not be displayed Write some concrete examples A blue light special with the message “dog food 15% off” is sent Customer Joe becomes disconnected from the wifi while receiving the message Then Joe will see (ask the PO) Here’s rule Here’s a concrete example

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©1993 – 2018 Scrum.org All Rights Reserved Other examples to consider Does this work with all mobile? Can the message notification be turned off? What if the characters are > 200? What if 2 messages are active and a customer connects?

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©1993 – 2018 Scrum.org All Rights Reserved Why examples are appropriate Inductive reasoning moves from specific instances into a generalized conclusion Deductive reasoning moves from generalized principles that are known to be true to a true and specific conclusion. Inductive reasoning is good for drawing conclusions that are not explicitly stated

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©1993 – 2018 Scrum.org All Rights Reserved BDD "BDD practitioners explore, discover, define then drive out the desired behavior of software using conversation, concrete examples and automated tests" Matt Wynne, The Cucumber Book Automate Tools Formulate Given, when, then Discover Examples and rules

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©1993 – 2018 Scrum.org All Rights Reserved The components Discovery Using examples to drive out story details, acceptance criteria, and new stories Formulation Using the examples to create a standardized (ubiquitous) language Automation Using the ubiquitous language to drive out automated specification verifications (tests)

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©1993 – 2018 Scrum.org All Rights Reserved What to focus on in BDD Discover Formulate Automate Discover Formulate Automate Benefits Effort to Enact Discover Formulate Automate Effectiveness for Refinement

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©1993 – 2018 Scrum.org All Rights Reserved . . . . Iterative Product Backlog Refinement 100% Story Title 50% Refined with AC 70% Story Body 25% Refined again 2 sprints sprint ready Sprint Planned Story Format Title: Body: As a I want So that Acceptance Criteria: -Verify that -Verify that -Verify that

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©1993 – 2018 Scrum.org All Rights Reserved Acceptance Criteria Acceptance Criteria The conditions that a software product must satisfy to be accepted by a user or customer. Rule One of a set of explicit or understood regulations or principles governing conduct within a particular activity or sphere. Acceptance criteria = Type of rule

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©1993 – 2018 Scrum.org All Rights Reserved Rule Rule https://cucumber.io/blog/2018/05/23/your-first-example-mapping-session Rule Example Story Question Example Example Example Example Example Example Example Example Story Question Question Question

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©1993 – 2018 Scrum.org All Rights Reserved An alternative format for examples Context Action Outcome A blue light special with the message “dog food 15% off” is sent Customer Joe is not connected to the store wifi Joe will see no message

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©1993 – 2018 Scrum.org All Rights Reserved Sounds like GWT format, doesn’t it? Given When Then A blue light special with the message “dog food 15% off” is sent Customer Joe is not connected to the store wifi Joe will see no message

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©1993 – 2018 Scrum.org All Rights Reserved Discover with Examples Pick a story Discover Make the test pass Refactor Code Write a failing unit test TDD BDD Convert example into Scenario Formulate Generate Scenario Automate Implement Scenario

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©1993 – 2018 Scrum.org All Rights Reserved Stepdef Code @Given("Î enter (\\d+) and -?(\\d+)$") public void i_enter_and(int arg1, int arg2) throws Throwable { myCalculator.insertNumber(arg1); myCalculator.insertNumber(arg2); // throw new PendingException(); } @When("Î press \"(w*?)\"$") public void i_press(String arg1) throws Throwable { myCalculator.press(arg1); } @Then("Î will see -?(\\d+)$") public void i_will_see(int arg1) throws Throwable { int result = myCalculator.getResult(); Assert.assertEquals("Test failed", arg1, result); // throw new PendingException(); }

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©1993 – 2018 Scrum.org All Rights Reserved References • Discovery by Seb Rose • The Cucumber Book by Wynne and Hellesoy • Cucumber for Java by Rose and Wynne • Cucumber.io • https://cucumber.io/blog/2015/12/08/example-mapping- introduction

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©1993 – 2018 Scrum.org All Rights Reserved 54 • https://www.scrum.org/ resources/blog • Articles to further your Scrum knowledge and improve your Agile practices. • Written by our community of world-class Professional Scrum Trainers. Blog - Read Insights and Tips from Our Trainers

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