Update parameter scenarios to use new API. Remove redundant scenarios.

Author: aslakhellesoy

features/custom_parameter.feature

@@ -0,0 +1,135 @@
+Feature: Parameter types
+
+  Users can define their own parameter types to be used in Cucumber expressions.
+  Custom parameter types can be used to match certain patterns, and optionally to
+  transform the matched value into a custom type.
+
+  Background:
+    Given a file named "features/particular_steps.feature" with:
+      """
+      Feature: a feature
+        Scenario: a scenario
+          Given a particular step
+      """
+    Given a file named "features/step_definitions/my_steps.js" with:
+      """
+      import assert from 'assert'
+      import {defineSupportCode} from 'cucumber'
+
+      defineSupportCode(({Given}) => {
+        Given('a {param} step', function(param) {
+          assert.equal(param, 'PARTICULAR')
+        })
+      })
+      """
+
+  Scenario: sync transform (success)
+    Given a file named "features/support/transforms.js" with:
+      """
+      import {defineSupportCode} from 'cucumber'
+
+      defineSupportCode(({defineParameterType}) => {
+        defineParameterType({
+          regexp: /particular/,
+          transformer: s => s.toUpperCase(),
+          typeName: 'param'
+        })
+      })
+      """
+    When I run cucumber.js
+    Then the step "a particular step" has status "passed"
+
+  Scenario: sync transform (success) using deprecated addTransform API
+    Given a file named "features/support/transforms.js" with:
+      """
+      import {defineSupportCode} from 'cucumber'
+
+      defineSupportCode(({addTransform}) => {
+        addTransform({
+          captureGroupRegexps: /particular/,
+          transformer: s => s.toUpperCase(),
+          typeName: 'param'
+        })
+      })
+      """
+    When I run cucumber.js
+    Then the step "a particular step" has status "passed"
+
+  Scenario: sync transform (error)
+    Given a file named "features/support/transforms.js" with:
+      """
+      import {defineSupportCode} from 'cucumber'
+
+      defineSupportCode(({defineParameterType}) => {
+        defineParameterType({
+          regexp: /particular/,
+          transformer: s => {
+            throw new Error('transform error')
+          },
+          typeName: 'param'
+        })
+      })
+      """
+    When I run cucumber.js
+    Then it fails
+    And the step "a particular step" failed with:
+      """
+      transform error
+      """
+
+  Scenario: no transform (error)
+    Given a file named "features/support/transforms.js" with:
+      """
+      import {defineSupportCode} from 'cucumber'
+
+      defineSupportCode(({defineParameterType}) => {
+        defineParameterType({
+          regexp: /particular/,
+          typeName: 'param'
+        })
+      })
+      """
+    When I run cucumber.js
+    Then it fails
+    And the step "a particular step" failed with:
+      """
+      AssertionError: 'particular' == 'PARTICULAR'
+      """
+
+  Scenario: async transform (success)
+    Given a file named "features/step_definitions/particular_steps.js" with:
+      """
+      import {defineSupportCode} from 'cucumber'
+      import Promise from 'bluebird'
+
+      defineSupportCode(({defineParameterType}) => {
+        defineParameterType({
+          regexp: /particular/,
+          transformer: s => Promise.resolve(s.toUpperCase()),
+          typeName: 'param'
+        })
+      })
+      """
+    When I run cucumber.js
+    Then the step "a particular step" has status "passed"
+
+  Scenario: async transform (error)
+    Given a file named "features/step_definitions/particular_steps.js" with:
+      """
+      import {defineSupportCode} from 'cucumber'
+      import Promise from 'bluebird'
+
+      defineSupportCode(({defineParameterType}) => {
+        defineParameterType({
+          regexp: /particular/,
+          transformer: s => Promise.reject(new Error('transform error')),
+          typeName: 'param'
+        })
+      })
+      """
+    When I run cucumber.js
+    Then it fails
+    And the step "a particular step" failed with:
+      """
+      transform error
+      """