[Cucumber] Expressions in Java

Tim Walker

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Jun 18, 2018, 2:22:56 PM6/18/18

to cu...@googlegroups.com

Hello,

I’m using cucumber expressions snd am struggling getting the basics working. I am not sure if I am doing it right as there was a little confusion around just providing the expression class like regular glue code (and it seems so simple!). Perhaps some can shed some light.

With this Gherkin:

Given a customer has a savings account

Given a customer has a checking account

And this step:

@Given("a customer has a {account_type} account")

public void a_customer_has_a_account(AccountType account_type) {

System.out.println("Has an account type: " + account_type);

}

And this entry in config\cucumber.yml:

typeRegistry.defineParameterType(new ParameterType<>(

"account_type", // name

"savings|checking", // regexp

AccountType.class, // type

AccountType::new // transformer function

))

With this inner-class in the steps file:

public class AccountType {

String accountType;

AccountType(String accountType) {

this.accountType = accountType;

}

I get this:

Exception in thread "main" cucumber.runtime.CucumberException: Could not create a cucumber expression for 'a customer has a {account_type} account'.

It appears you did not register parameter type. The details are in the stacktrace below.

You can find the documentation here: https://docs.cucumber.io/cucumber/cucumber-

expressions/

at io.cucumber.stepexpression.StepExpressionFactory.registerTypeInConfiguration(StepExpressionFactory.java:87)

at io.cucumber.stepexpression.StepExpressionFactory.createExpression(StepExpressionFactory.java:65)

at io.cucumber.stepexpression.StepExpressionFactory.createExpression(StepExpressionFactory.java:54)

--

Tim

Björn Rasmusson

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Jun 18, 2018, 3:19:13 PM6/18/18

to Cukes

Halfordian Golfer wrote:

Hello,

I’m using cucumber expressions snd am struggling getting the basics working. I am not sure if I am doing it right as there was a little confusion around just providing the expression class like regular glue code (and it seems so simple!). Perhaps some can shed some light.

With this Gherkin:
   Given a customer has a savings account
   Given a customer has a checking account

And this step:
   @Given("a customer has a {account_type} account")
   public void a_customer_has_a_account(AccountType account_type) {
       System.out.println("Has an account type: " + account_type);
   }

And this entry in config\cucumber.yml:

Cucumber-JVM does not use cucumber.yml. The java-calculator example uses ParameterTypes.java to define parameter types.

/Björn

Tim Walker

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Jun 18, 2018, 4:00:06 PM6/18/18

to cu...@googlegroups.com

Björn thank you. [tim] below inline...

On Mon, Jun 18, 2018, 12:19 Björn Rasmusson <bj.ras...@gmail.com> wrote:

Halfordian Golfer wrote:
Hello,

I’m using cucumber expressions snd am struggling getting the basics working. I am not sure if I am doing it right as there was a little confusion around just providing the expression class like regular glue code (and it seems so simple!). Perhaps some can shed some light.

With this Gherkin:
   Given a customer has a savings account
   Given a customer has a checking account

And this step:
   @Given("a customer has a {account_type} account")
   public void a_customer_has_a_account(AccountType account_type) {
       System.out.println("Has an account type: " + account_type);
   }

And this entry in config\cucumber.yml:

Cucumber-JVM does not use cucumber.yml. The java-calculator example uses ParameterTypes.java to define parameter types.

[Tim] Thank you very much. This is not at all obvious as the stack trace "Register Type In Configuration" - sure looks like it wants to give it a go from the YML! So, to be clear, don;t register parameter types using profiles or configurations but, rather, leave an "extended ParameterType.java" in the path to do the deed? Thanks again. Tim

/Björn

   typeRegistry.defineParameterType(new ParameterType<>(
   "account_type",       // name
   "savings|checking",    // regexp
    AccountType.class,    // type
   AccountType::new      // transformer function
     ))

With this inner-class in the steps file:
public class AccountType {
             String accountType;
               AccountType(String accountType) {
                            this.accountType = accountType;
               }
}

I get this:
Exception in thread "main" cucumber.runtime.CucumberException: Could not create a cucumber expression for 'a customer has a {account_type} account'.
It appears you did not register parameter type. The details are in the stacktrace below.
You can find the documentation here: https://docs.cucumber.io/cucumber/cucumber-
expressions/
        at io.cucumber.stepexpression.StepExpressionFactory.registerTypeInConfiguration(StepExpressionFactory.java:87)
        at io.cucumber.stepexpression.StepExpressionFactory.createExpression(StepExpressionFactory.java:65)
        at io.cucumber.stepexpression.StepExpressionFactory.createExpression(StepExpressionFactory.java:54)

--
Tim

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