NoMethodError when method(sym) used for ParameterType.transformer

[mitchgrout]

👓 What did you see?

$ cucumber 
undefined method '[]' for nil (NoMethodError)
/usr/local/bundle/gems/cucumber-9.2.1/lib/cucumber/glue/registry_and_more.rb:211:in 'Cucumber::Glue::RegistryAndMore#parameter_type_envelope'
/usr/local/bundle/gems/cucumber-9.2.1/lib/cucumber/glue/registry_and_more.rb:83:in 'Cucumber::Glue::RegistryAndMore#define_parameter_type'
/usr/local/bundle/gems/cucumber-9.2.1/lib/cucumber/glue/dsl.rb:27:in 'Cucumber::Glue::Dsl.define_parameter_type'
/usr/local/bundle/gems/cucumber-9.2.1/lib/cucumber/glue/dsl.rb:103:in 'Cucumber::Glue::Dsl#ParameterType'
/tmp/tmp.yvPAzY6fzD/features/support/env.rb:3:in '<top (required)>'
...

✅ What did you expect to see?

No uncaught errors should have been raised/propagated to the top-level

📦 Which tool/library version are you using?

ruby (3.4.4)
cucumber (9.2.1)
cucumber-ci-environment (10.0.1)
cucumber-core (13.0.3)
cucumber-cucumber-expressions (17.1.0)
cucumber-gherkin (27.0.0)
cucumber-html-formatter (21.9.0)
cucumber-messages (22.0.0)
cucumber-tag-expressions (6.1.2)

🔬 How could we reproduce it?

Feature: Reproduction for issue #1788
  Scenario: Using a top-level method() to populate the transformer of a ParameterType
    Given a file named "features/test.feature" with:
      """
      Feature: Example
        Scenario: Sample
          Given a path named "example"
      """
    And a file named "features/support/env.rb" with:
      """
      require "pathname"
      ParameterType(
        name:        "path",
        regexp:      /"([^"]*)"/,
        transformer: method(:Pathname),
      )
      """
    And a file named "features/step_definitions/all.rb" with:
      """
      Given("a path named {path}") do |actual|
        expected = Pathname("example")
        fail [actual, expected].inspect unless actual == expected
      end
      """
    When I run `cucumber -q`
    Then it should pass with:
      """
      Feature: Reprod
      
        Scenario: Example
          Given a path named "example"
      
      1 scenario (1 passed)
      1 step (1 passed)
      """

📚 Any additional context?

If you replace the transformer value with a block/lambda/proc:

transformer: ->(x) { Pathname(x) },

...then the issue is alleviated.

This issue does not seem to affect cucumber-8.0 + ruby-2.6

[luke-hill]

Thanks for this. Looks fairly simple.

Just for clarity again, this won't be fixed for v10, as this has been already quite delayed. Once v10 is out I promise I will get to these.

[mitchgrout]

Thanks for this. Looks fairly simple.

Just for clarity again, this won't be fixed for v10, as this has been already quite delayed. Once v10 is out I promise I will get to these.

No worries! Just posting issues as I find them, most of the things I tend to find have very straight-forward workarounds