Behavior Driven Development with JUnit 5. Part 5
The fifth part of our article on Behavior Driven Development with JUnit 5. Happy reading.
We’ll now create a new Java class in the test/java folder, in the com.luxoft.bddjunit5.airport package. This class will be named PassengerPolicy and, at first, will contain the test skeleton. The execution of such a test follows the scenarios described in the passenger_policy.feature file. For example, when executing the step
Given there is an economy flight
the program will execute the method annotated with
@Given(“^there is an economy flight$”)
public class PassengerPolicy {
@Given(“^there is an economy flight$”) #1
public void there_is_an_economy_flight() throws Throwable { #2
// Write code here that turns the phrase above into concrete actions #2
throw new PendingException(); #2
} #2
@When(“^we have a regular passenger$”) #3
public void we_have_a_regular_passenger() throws Throwable { #4
// Write code here that turns the phrase above into concrete actions #4
throw new PendingException(); #4
} #4
@Then(“^you can add and remove him from an economy flight$”) #5
public void you_can_add_and_remove_him_from_an_economy_flight() #6
throws Throwable { #6
// Write code here that turns the phrase above into concrete actions #6
throw new PendingException(); #6
} #6
[…]
}
In this listing:
- The Cucumber plugin generates a method annotated with @Given(“^there is an economy flight$”), meaning this method is executed when the step Given there is an economy flight from the scenario is executed #1.
- The plugin generates a method stub to be implemented with the code addressing the step Given there is an economy flight from the scenario #2.
- The plugin generates a method annotated with @When(“^we have a regular passenger$”), meaning this method is executed when the step When we have a regular passenger from the scenario is executed #3.
- The plugin generates a method stub to be implemented with the code addressing the step When we have a regular passenger from the scenario #4.
- The plugin generates a method annotated with @Then(“^you can add and remove him from an economy flight$”), meaning this method is executed when the step. Then you can add and remove him from an economy flight from the scenario is executed #5.
- The plugin generates a method stub to be implemented with the code addressing the step Then you can add and remove him from an economy flight from the scenario #6.
- The rest of the methods are implemented in a similar way; we have covered the Given, When, and Then steps of one scenario.
We follow the business logic of each step that has been defined and translates it into the tests — the steps of the scenarios that need to be verified.
public class PassengerPolicy {
private Flight economyFlight; #1
private Passenger mike; #1
[…]
@Given(“^there is an economy flight$”) #2
public void there_is_an_economy_flight() throws Throwable { #2
economyFlight = new EconomyFlight(“1”); #3
}
@When(“^we have a regular passenger$”) #4
public void we_have_a_regular_passenger() throws Throwable { #4
mike = new Passenger(“Mike”, false); #5
}
@Then(“^you can add and remove him from an economy flight$”) #6
public void you_can_add_and_remove_him_from_an_economy_flight() #6
throws Throwable {
assertAll(“Verify all conditions for a regular passenger #7
and an economy flight”, #7
() -> assertEquals(“1”, economyFlight.getId()), #7
() -> assertEquals(true, economyFlight.addPassenger(mike)), #7
() -> assertEquals(1, #7
economyFlight.getPassengersSet().size()), #7
() ->
assertTrue(economyFlight.getPassengersSet().contains(mike)), #7
() -> assertEquals(true, economyFlight.removePassenger(mike)), #7
() -> assertEquals(0, economyFlight.getPassengersSet().size()) #7
);
}
[…]
}
In this listing:
- We declare the instance variables for the test, including economyFlight and mike as a Passenger #1.
- We write the method corresponding to the Given there is an economy flight business logic step #2 by initializing economyFlight #3.
- We write the method corresponding to the When we have a regular passenger business logic step #4 by initializing the regular passenger mike #5.
- We write the method corresponding to the Then you can add and remove him from an economy flight business logic step #6 by checking all the conditions using the assertAll JUnit 5 method, which can now be read fluently #7.
- The rest of the methods are implemented in a similar way; we have covered the Given, When, and Then steps of one scenario.
Interested in JUnit? Check out our trainings.
Catalin Tudose
Java and Web Technologies Expert
Originally published at https://www.luxoft-training.com.
