API Matchers

Collection of RSpec matchers for create your API.

Matchers

• be_in_xml
• be_a_json
• create_resource
• be_a_bad_request
• be_unauthorized
• be_internal_server_error
• have_node
• have_json_node
• have_xml_node
• be_json_eql
• be_xml_eql

Install

  gem install api_matchers

Usage

Including in RSpec

To include all this matchers you need to include the APIMatchers::RSpecMatchers module:

RSpec.configure do |config|
  config.include APIMatchers::RSpecMatchers
end

Have Node Matcher

The have_node matcher parse the actual and see if have the expcted node with the expected value. The default that have_node will parse is JSON.

You can verify if node exists:

  "{ 'transaction': { 'id': '54', 'status': 'paid' } }".should have_node(:transaction)

Or if node exist with a value:

  "{ 'transaction': { 'id': '54', 'status': 'paid' } }".should have_node(:id).with(54)

  "{ 'error': 'not_authorized', 'transaction': { 'id': '55' } }".should have_node(:error).with('not_authorized')

To see the json node and see if include a text, you can do this:

  { :error => "Transaction error: Name can't be blank" }.to_json.should have_node(:error).including_text("Transaction error")

HAVE NODE Matcher Configuration

You can configure if you want xml(JSON is the default):

  APIMatchers.setup do |config|
    config.content_type = :xml
  end

  '<transaction><id>200</id><status>paid</status></transaction>'.should have_node(:status)

Using the with method:

  '<transaction><id>200</id><status>paid</status></transaction>'.should have_node(:status).with('paid')

Or you can use the have_xml_node matcher:

  "<error>Transaction error: Name can't be blank</error>".should have_xml_node(:error).with("Transaction error: Name can't be blank")

To see the xml node and see if include a text, you can do this:

  "<error>Transaction error: Name can't be blank</error>".should have_xml_node(:error).including_text("Transaction error")

If you work with xml and json in the same API, I recommend that you check the have_json_node and have_xml_node matchers.

You can configure the name of the method for example:

  ## Instead of this
  response.body.should have_node(:foo)

  ## YOU can do this
  APIMatchers.setup do |config|
    config.body_method = :body
  end

Then you can use without call the #body method:

  response.should have_node(:foo).with('bar')

Have JSON Node Matcher

"{ 'transaction': { 'id': '54', 'status': 'paid' } }".should have_json_node(:id).with(54)

Have XML Node Matcher

"<product><name>gateway</name></product>".should have_xml_node(:name).with('gateway')

Create Resource Matcher

This matchers see the HTTP STATUS CODE is equal to 201.

 response.status.should create_resource

BAD REQUEST Matcher

This BAD REQUEST is a matcher that see if the HTTP STATUS code is equal to 400.

response.status.should be_a_bad_request
response.status.should be_bad_request

UNAUTHORIZED Matcher

This UNAUTHORIZED is a matcher that see if the HTTP STATUS code is equal to 401.

response.status.should be_unauthorized
response.body.should have_node(:message).with('Invalid Credentials')

INTERNAL SERVER ERROR Matcher

This INTERNAL SERVER Error is a matcher that see if the HTTP STATUS code is equal to 500.

response.status.should be_internal_server_error
response.body.should have_node(:message).with('An Internal Error Occurs in our precious app. :S')

HTTP STATUS CODE Configuration

You can configure the name method to call the http status code:

 APIMatchers.setup do |config|
   config.http_status_method = :status
 end

Then you can use without call the #status method:

response.should create_resource

This configurations affects this matchers:

• create_resource
• be_a_bad_request
• be_internal_server_error
• be_unauthorized

Be in XML Matcher

This is a matcher that see if the content type is xml:

response.headers['Content-Type'].should be_in_xml

Be in JSON Matcher

This is a matcher that see if the content type is in JSON:

response.headers['Content-Type'].should be_in_json

Headers Configuration

You can configure the name method to call the headers and content type:

APIMatchers.setup do |config|
  config.header_method           = :headers
  config.header_content_type_key = 'Content-Type'
end

Then you can use without call the #headers calling the #['Content-Type'] method:

response.should be_in_json
response.should be_in_xml

Acknowlegments

• Special thanks to Daniel Konishi to contribute in the product that I extracted the matchers to this gem.