JBehave

JBehave is a tool for Behavior Driven Development(BDD).

What is BDD ?

BDD is a Software development based on TDD which is

• Developed by Dan North
• Addresses problems with TDD

What problems does JBehave address?

Programmers wanted to know:

• “Where to start”
• “What to test and what not to test”
• “How much to test” at one time
• “What to call” the tests
• “How to understand why a test fails”

Philosophy of BDD

• “Test method names should be sentences”
• “Simple sentence template”
  • The class should do something”
• “An expressive test name is helpful”
• What behaviors should be implemented?
• Requirements determine the behaviors
• Standard language (Given, when, then)

 

Getting Started with JBehave

• “Download the JBehave core jar”

http://mvnrepository.com/artifact/org.jbehave/jbehave-core/3.0-rc1

• Put the jar file in your project workspace
• Create and run a simple scenario
• Try to replicate someone else’s work first

Download scenarios.tgz:

https://wiki.umn.edu/pub/UmmCSci3601s10/SettingUpJBehaveInEclipse/scenarios.tgz

 

Create and Run a Scenario

Three files needed:

• Scenario text file with given-when-then format
• Java/file class to extend Scenario file
• Java steps file for the method shells

 

Sample scenario text file (make_pancakes_scenario)

Scenario: Making pancakes in a skillet
Given some pancake batter
And a hot frying pan
When I pour the batter into the frying pan
And wait for 2 minutes or until the sides are dry
And flip the pancake over
And wait for 1 minute
Then I get a cooked pancake
 

Sample Java file/class (MakePancakesScenario.java)

package com.cse.simple.stories;
import org.jbehave.scenario.Scenario;
public class MakePancakesScenario extends Scenario {
public MakePancakesScenario() {
super (new PancakeCookingSteps() );
}
}
 

Sample Java steps file(1) (PancakeCookingSteps.java)

package com.cse.simple.steps;
import org.jbehave.core.annotations.Given;
import org.jbehave.core.annotations.Then;
import org.jbehave.core.annotations.When;
public class PancakeCookingSteps {
@Given(“some pancake batter”)
public void howMuchBatter() {
// add code for amount of batter
}
@Given(“hot frying pan”)
public void heatFryingPan() {
// add code to determine heat
}
@When(“I pour the batter into the frying pan”)
public void startCooking() {
// add code to start cooking
}
// continued on next slide
 

Sample Java steps file(2) (PancakeCookingSteps.java)

// continued from previous slide
@When(“wait for 2 minutes or until the sides are dry”)
public void cookFirstSide() {
// add code to cook first side
}
@When(“flip the pancake”)
public void flipPancake() {
// add code to flip pancake
}
@When(“wait for 1 minute”)
public void cookSecondSide() {
// add code to cook second side
}
@Then(“I get a cooked pancake”)
public void putPancakeOnPlate() {
// add code to move pancake from frying pan to plate
}
}
 

Test class files with JUnit

Follow the steps in the JUnit_Testing pdf

• https://wiki.uta.edu/display/serc/CSE-5324+Tools
• Generate a JUnit test case template
• Update the test file with test cases
• Run the test cases with JUnit