[Cucumber] [JVM] State of the "World"

[Tim Walker]

Hi, 

What is the current state of the Cucumber "World" object in Cucumber-JVM? I see some references to what looks like roll-your-own singleton pattern for global usage and some references in the new "Cucumber Recipes" book but am having a hard time finding any documentation or references to the current state. Has this been deprecated or ? 

Many thanks, 

Tim

[aslak hellesoy]

On Mon, Jun 17, 2013 at 12:20 PM, Tim Walker <walk...@gmail.com> wrote:

Hi, 

What is the current state of the Cucumber "World" object in Cucumber-JVM?

It depends on what programming language you're using. Are you using Java?

Aslak

 

I see some references to what looks like roll-your-own singleton pattern for global usage and some references in the new "Cucumber Recipes" book but am having a hard time finding any documentation or references to the current state. Has this been deprecated or ? 

Many thanks, 

Tim

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[Tim Walker]

Java. 

Thank you.

Tim

[aslak hellesoy]

A: Because it messes up the order in which people normally read text.

Q: Why is top-posting such a bad thing?

A: Top-posting.

Q: What is the most annoying thing in e-mail?

See rule [2]

On Mon, Jun 17, 2013 at 12:45 PM, Tim Walker <walk...@gmail.com> wrote:

Java. 

Thank you.

Tim

On Mon, Jun 17, 2013 at 11:36 AM, aslak hellesoy <aslak.h...@gmail.com> wrote:

On Mon, Jun 17, 2013 at 12:20 PM, Tim Walker <walk...@gmail.com> wrote:

Hi, 

What is the current state of the Cucumber "World" object in Cucumber-JVM?

It depends on what programming language you're using. Are you using Java?

Ok, so you're using Java.

The purpose of a "World" is twofold:

1) Isolate state between scenarios.

2) share data between step definitions and hooks within a scenario.

How this is implemented is language specific. For example, in ruby, the implicit `self` variable inside a step definition points to the current scenario's World object. This is by default an instance of Object, but it can be anything you want if you use the World hook.

It's similar in Groovy.

It's different in Java. You have many (possibly connected) World objects.

The equivalent of the World in Cucumber-Java is _all of the objects with hook or stepdef annotations_. In other words, any class with methods annotated with @Before, @After, @Given and so on will be instantiated exactly once for each scenario.

This achieves the first goal.

To achieve the second goal you have two approaches:

a) Use a single class for all of your step definitions and hooks

b) Use several classes divided by responsibility [1] and use dependency injection [2] to connect them to each other.

Option a) quickly breaks down because your step definition code becomes a mess. That's why people tend to use b).

[1] https://github.com/cucumber/cucumber/wiki/Step-Organisation

[2] PicoContainer, Spring, Guice, Weld, OpenEJB

Does this answer your question?

Aslak

[Tim Walker]

Yes. Thank you. Tim