Collection of helper methods for testing "shape" of the data
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README.md

AnyValue

Build Status

AnyValue is a collection of helper methods like: anything, any_number, any_string that is useful for testing nested data structures (like arrays or hashes) when you care more about some particular elements and the "shape" of the data, than about the entire data structure.

without this gem:

# Asserting all elements, even the attributes you don't really care about (ids, created_at fields etc)

def test_create
  item1 = Item.create!(name: "Item 1")
  item2 = Item.create!(name: "Item 2")

  get "/items"

  assert_equal [
    {"id" => item1.id, "name" => "Item 1"},
    {"id" => item2.id, "name" => "Item 2"},
  ], JSON(response.body)
end

# Extracting out subset of attributes you care about:

def test_create
  item1 = Item.create!(name: "Item 1")
  item2 = Item.create!(name: "Item 2")

  get "/items"

  assert_equal [
    "Item 1", "Item 2",
  ], JSON(response.body).map { |h| h['name'] }
end

with this gem:

def test_create
  item1 = Item.create!(name: "Item 1")
  item2 = Item.create!(name: "Item 2")

  get "/items"

  assert_equal [
    {"id" => any_integer, "name" => "Item 1"},
    {"id" => any_integer, "name" => "Item 2"},
  ], JSON(response.body)
end

Usage

All you have to do is to include AnyValue module to your program/test/whatever.

Example:

require 'any_value'
require 'minitest/autorun'

class Test < Minitest::Test
  include AnyValue

  def test_anything
    assert_equal any_number, 42
  end
end

Composition

You can compose helpers like this:

acronym = upcase_string ^ string_of_length(3)

acronym == "NBA"  # => true
acronym == "nba"  # => false
acronym == "NASA" # => false

And like that for arrays:

array_of_integers = array_of(any_integer)

array_of_integers == [1, 2, 3]   # => true
array_of_integers == [1, nil, 3] # => false

See: https://github.com/wojtekmach/anything/blob/master/test/anything_test.rb for more examples.

Installation

The gem is not released to rubygems.org yet, since this name is taken.

You can install it via bundler by adding gem 'anything', github: 'wojtekmach/anything' to your Gemfile or by cloning it and running rake install.

Contributing

  1. Fork it ( https://github.com/wojtekmach/anything/fork )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request