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BDD
BEHAVIOUR DRIVEN DEVELOPMENT
NO INTEGRATION TEST
TWO UNIT TESTS PASSED
WOULDN’T IT BE GREAT?
• Clear requirements
• Measurable acceptance
criteria
• Documentation of existing
functionality
• Confidence everything
works?
“WHAT’S THE PURPOSE OF MEANING?”
WHAT IS BDD
A. A way to structure unit tests
B. Unit tests with a new name
C. Executable specifications
D. Automated Test Scenarios
FORM
B.D.D.
Given [initial state]
When [do stuff]
Then [result]
B.D.D.
EXAMPLE
Feature: Green Bottles
Scenario: Should fall from the wall
Given 100 green bottles are standing on the wall
When 1 green bottle accidentally falls
Then there are 99 green bottles standing on the wall
“MAKE IT RUN”
THE CODE
module.exports = English.library()
.given("$NUM green bottles are standing on the wall", function(number, next) {
wall = new Wall(number);
next();
})
.when("$NUM green bottle accidentally falls", function(number, next) {
wall.fall(number);
next();
})
.then("there are $NUM green bottles standing on the wall", function(number, next) {
assert.equal(number, wall.bottles);
next();
});
EXECUTE IT!
macbookpro:yadda-tutorial machiel$ mocha --reporter spec test.js
100 Green Bottles
Should fall from the wall
✓ Given 100 green bottles are standing on the wall
✓ When 1 green bottle accidentally falls
✓ Then there are 99 green bottles standing on the wall
3 passing (34ms)
DONEC QUIS NUNC
ALTERNATIVE: CODE DECORATION
describe("A suite", function() {
it("contains spec with an expectation", function() {
expect(true).toBe(true);
});
});
A suite
contains spec with an expectation
DIVIDE ET IMPERA
ONE SCENARIO TO RULE THEM ONE
SCENARIO
SERVER SIDE
TEST
UI
TEST
MULTI
BROWSER
TEST
PERFORMANCE
TEST
“COMPARISON IS THE THIEF OF JOY”
BDD VS TDD
• Unit
• One function or class
• language of the system
• fine grained
• Behaviour
• the whole system
• language of the user
• coarse
BENEFITS
USER LEVEL TESTS
• Test linked to Story
• Done or not
• Technology agnostic
• Multiple usages
• Refactor friendly
CLARITY
SECURITY
SPEED
BDD IN A
NUTSHELL
LIBRARIES
Pure BDD in JS https://github.com/acuminous/yadda
Yadda in crossbrowser testing
https://github.com/kjelloe/Yadda-
WebdriverJS

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BDD

  • 2. NO INTEGRATION TEST TWO UNIT TESTS PASSED
  • 3. WOULDN’T IT BE GREAT? • Clear requirements • Measurable acceptance criteria • Documentation of existing functionality • Confidence everything works?
  • 4. “WHAT’S THE PURPOSE OF MEANING?” WHAT IS BDD A. A way to structure unit tests B. Unit tests with a new name C. Executable specifications D. Automated Test Scenarios
  • 5. FORM B.D.D. Given [initial state] When [do stuff] Then [result]
  • 6. B.D.D. EXAMPLE Feature: Green Bottles Scenario: Should fall from the wall Given 100 green bottles are standing on the wall When 1 green bottle accidentally falls Then there are 99 green bottles standing on the wall
  • 7. “MAKE IT RUN” THE CODE module.exports = English.library() .given("$NUM green bottles are standing on the wall", function(number, next) { wall = new Wall(number); next(); }) .when("$NUM green bottle accidentally falls", function(number, next) { wall.fall(number); next(); }) .then("there are $NUM green bottles standing on the wall", function(number, next) { assert.equal(number, wall.bottles); next(); });
  • 8. EXECUTE IT! macbookpro:yadda-tutorial machiel$ mocha --reporter spec test.js 100 Green Bottles Should fall from the wall ✓ Given 100 green bottles are standing on the wall ✓ When 1 green bottle accidentally falls ✓ Then there are 99 green bottles standing on the wall 3 passing (34ms)
  • 9. DONEC QUIS NUNC ALTERNATIVE: CODE DECORATION describe("A suite", function() { it("contains spec with an expectation", function() { expect(true).toBe(true); }); }); A suite contains spec with an expectation
  • 10. DIVIDE ET IMPERA ONE SCENARIO TO RULE THEM ONE SCENARIO SERVER SIDE TEST UI TEST MULTI BROWSER TEST PERFORMANCE TEST
  • 11. “COMPARISON IS THE THIEF OF JOY” BDD VS TDD • Unit • One function or class • language of the system • fine grained • Behaviour • the whole system • language of the user • coarse
  • 12. BENEFITS USER LEVEL TESTS • Test linked to Story • Done or not • Technology agnostic • Multiple usages • Refactor friendly
  • 14. LIBRARIES Pure BDD in JS https://github.com/acuminous/yadda Yadda in crossbrowser testing https://github.com/kjelloe/Yadda- WebdriverJS