define_parameter_type: Parameter Type

In cucumber: Behavior-Driven Development for R

Parameter Type

Description

The following parameter types are available by default:

Type	Description
{int}	Matches integers, for example 71 or -19. Converts value with as.integer.
{float}	Matches floats, for example 3.6, .8 or -9.2. Converts value with as.double.
{word}	Matches words without whitespace, for example banana (but not ⁠banana split⁠).
{string}	Matches single-quoted or double-quoted strings, for example "banana split" or 'banana split' (but not ⁠banana split⁠). Only the text between the quotes will be extracted. The quotes themselves are discarded.

To use custom parameter types, call define_parameter_type before cucumber::test is called.

Usage

define_parameter_type(name, regexp, transformer)

Arguments

name	The name of the parameter.
regexp	A regular expression that the parameter will match on. Note that if you want to escape a special character, you need to use four backslashes.
transformer	A function that will transform the parameter from a string to the desired type. Must be a function that requires only a single argument.

Value

An object of class parameter, invisibly. Function should be called for side effects.

Examples

define_parameter_type("color", "red|blue|green", as.character)
define_parameter_type(
  name = "sci_number",
  regexp = "[+-]?\\\\d*\\\\.?\\\\d+(e[+-]?\\\\d+)?",
  transform = as.double
)

## Not run: 
#' tests/testthat/test-cucumber.R
cucumber::define_parameter_type("color", "red|blue|green", as.character)
cucumber::test(".", "./steps")

## End(Not run)

cucumber documentation built on June 30, 2024, 1:07 a.m.