Rename into have_jsonapi_attributes

RSpec core matchers already have a `have_attributes` matcher.

The matcher is extended to check strictly the number of attributes.

Closes #4

Author: stas

README.md

@@ -36,7 +36,8 @@ Available matchers:
 
 * `expect(document['data']).to have_id('12')`
 * `expect(document['data']).to have_type('users')`
-* `expect(document['data']).to have_attributes(:name, :email)`
+* `expect(document['data']).to have_jsonapi_attributes(:name, :email)`
+* `expect(document['data']).to have_jsonapi_attributes(:name, :email, :country).exactly`
 * `expect(document['data']).to have_attribute(:name).with_value('Lucas')`
 * `expect(document['data']).to have_relationships(:posts, :comments)`
 * `expect(document['data']).to have_relationship(:posts).with_data([{ 'id' => '1', 'type' => 'posts' }])`

lib/jsonapi/rspec/attributes.rb

@@ -13,11 +13,18 @@ module Attributes
         end
       end
 
-      ::RSpec::Matchers.define :have_attributes do |*attrs|
+      ::RSpec::Matchers.define :have_jsonapi_attributes do |*attrs|
         match do |actual|
           return false unless actual.key?('attributes')
 
-          attrs.all? { |attr| actual['attributes'].key?(attr.to_s) }
+          counted = (attrs.size == actual['attributes'].size) if @exactly
+
+          (attrs.map(&:to_s) - actual['attributes'].keys).empty? &&
+            (counted == @exactly)
+        end
+
+        chain :exactly do
+          @exactly = true
         end
       end
     end

lib/jsonapi/rspec/relationships.rb

@@ -17,7 +17,8 @@ module Relationships
           if !(actual['relationships'] || {}).key?(rel.to_s)
             "expected #{actual} to have relationship #{rel}"
           else
-            "expected #{actual['relationships'][rel.to_s]} to have data #{@data_val}"
+            "expected #{actual['relationships'][rel.to_s]} " \
+              "to have data #{@data_val}"
           end
         end
       end

spec/jsonapi/attributes_spec.rb

@@ -0,0 +1,25 @@
+require 'spec_helper'
+
+RSpec.describe JSONAPI::RSpec do
+  let(:doc) do
+    {
+      'attributes' => {
+        'one' => 1,
+        'two' => 2,
+        'four' => 3
+      }
+    }
+  end
+
+  describe '#have_attribute' do
+    it { expect(doc).to have_attribute(:one) }
+    it { expect(doc).not_to have_attribute(:five) }
+  end
+
+  describe '#have_jsonapi_attributes' do
+    it { expect(doc).to have_jsonapi_attributes(:one, :two) }
+    it { expect(doc).not_to have_jsonapi_attributes(:two, :five) }
+    it { expect(doc).to have_jsonapi_attributes(:one, :two, :four).exactly }
+    it { expect(doc).not_to have_jsonapi_attributes(:one).exactly }
+  end
+end

spec/jsonapi/jsonapi_object_spec.rb

@@ -3,7 +3,7 @@
 RSpec.describe JSONAPI::RSpec, '#have_jsonapi_object' do
   context 'when providing no value' do
     it 'succeeds when jsonapi object is present' do
-      expect('jsonapi' => { 'version' => '1.0'}).to have_jsonapi_object
+      expect('jsonapi' => { 'version' => '1.0' }).to have_jsonapi_object
     end
 
     it 'fails when jsonapi object is absent' do