RSpecZ

RSpecZ is a powerful extension for RSpec with strong and straightforward syntaxes. With RSpecZ you can handle different contexts with only a single line of code. RSpecZ also provides a number of aliases to improve the readability of RSpec code.

Installation

Add this line to your application's Gemfile:

Use github syntax until release Version 1.0.

gem 'rspecz', github: 'RSpecZ/RSpecZ'

Features

Context

This is one of the most powerful features in RSpecZ. RSpecZ has a number of context-related methods that can automatically generate context descriptions for you. You can also use methods like set_values to assign different values to a variable without writing multiple lines of code in your test.

Let

RSpecZ provides variable assignment methods like crate_params and strings, which allows you to create complex variables in only one line of code.

Subject

RSpecZ also provides subject-related methods to simplify your code when you test subjects.

Alias

To improve the readability of your test code, RSpecZ provides aliases such as make and behave. These aliases can help to greatly simplify your code and make them easier to review.

Usage

context

set

You can use set to set value to a variable, and execute the specified block:

set(name, value) { my_block }

This will automatically create context description for you based on the name and value you specified, like this:

context "when #{name} is #{value}" do
  let(name) { value }
  my_block
end

In the example above, value is assigned to name and the specified block will be executed.

You can also specify your own description:

set(name, value, 'my_context_description') { my_block }

or provide a multiple-line block:

set(name, value) do
  # do something
  # ...
  # do more things
end  

set_values

set_values allows you to assign multiple values to a variable in only one line of code, it also creates context for each value, for example:

set_values(:age, 20, 30) { my_block }

This equals to:

context "when age is 20" do
  let(:age) { 20 }
  my_block
end

context "when age is 30" do
  let(:age) { 30 }
  my_block
end

Same as set, you can pass your own context description, or even do not pass a block.

set_nil

Similar to set, but you do not have to specify the value because it will be set to nil automatically, for example:

set_nil(name) { my_block }

will generate the code like this:

context "when #{name} is nil" do
  let(name) { nil }
  my_block
end

set_nils

This the plural version of set_nil, it allows you to assign nil to each variable (while others remain the default value?) and creates context descriptions for each value.

set_valid

Same as set, except that the context description will point out that the value is valid:

context "when #{name} is valid(#{value})" do
  let(name) { value }
  my_block
end

set_invalid

Same as set, except that the context description will point out that the value is invalid:

context "when #{name} is not valid(#{value})" do
  let(name) { value }
  my_block
end

set_invalids

The plural version of set_invalid, it allows you to assign multiple invalid values to the variable, and creates proper context descriptions for each invalid value.

context "when #{name} is not valid(#{value1})" do
  let(name) { value }
  my_block
end

context "when #{name} is not valid(#{value2})" do
  let(name) { value }
  my_block
end

This is extremely useful when you do value checking like emails:

set_invalids(:email, 'user@example', 'user.example.com') { # invalid email address }

set_block

Similar to set, but set_block also allows you to assign a variable with block:

set_block(:user) { create(:user, name: 'Alan', age: 20) }.spec { my_block }

set_missing

Similar to set, except that the context description will point out that the value does not exist:

context "when #{name} does not exist(#{value})" do
  let(name) { value }
  my_block
end

set_context

set_context will include the specified shared context and generate a proper context description, for example:

set_context(shared_context) { my_block }

will act like this:

context "when include context(#{name})" do
  include_context name
  my_block
end

---

let

create_params

create_params helps to create hash in just one line.

Suppose you have some variables like this:

let(:name) { 'Alan' }
let(:age) { 20 }

Generally, to create a hash with these variables, you need to write:

let(:params) {{
  name: name,
  age: age
}}

While in RSpecZ, you just use create_params and it will automatically create a hash with proper keys and values:

create_params(:name, :age)

string

string is useful when you are trying to create a number of strings, it will create strings using the variable name with the prefix test-.

For example:

string(name, address)

This equals to:

let(:name) { 'test-name' }
let(:address) { 'test-address' }

---

subject

subject_freezed

Some times the code needs to be tested under a specified time. In RSpec, you will write code like this:

let(:now) { Time.zone.now }
subject do
  travel_to(now) do
    my_block
  end
end

However, RSpecZ provides a simpler way to do this:

let(:now) { Time.zone.now }
subject_freezed { my_block }

---

alias

make

let and let! are so confusing for rubyists when writing specs, for example:

let(:user)    { create(:user) }
let!(:post)   { create(:post, user: user) } # eager evaluation
let(:like)    { create(:like, user: user, post: post) }
let(:comment) { create(:comment, user: user, post: post) }

In RSpecZ, you can use make instead of let!, which provides better identification and readability.

let(:user)    { create(:user) }
make(:post)   { create(:post, user: user) } # eager evaluation
let(:like)    { create(:like, user: user, post: post) }
let(:comment) { create(:comment, user: user, post: post) }

behave

RSpecZ also provides a short version of it_behaves_like when you use shared_examples, just use the keyword behave:

behave 'my_shared_examples'

# equals to:
# it_behaves_like 'my_shared_examples'

Contributing

Bug reports and pull requests are welcome on GitHub.

License

The gem is available as open source under the terms of the MIT License.