Add matcher be_a_list_of

README.md

@@ -20,13 +20,13 @@ Execute:
     $ bundle
 
 Require the gem at the top of your `spec/rails_helper.rb` (or equivalent):
-``` ruby 
+``` ruby
 require 'smart_rspec'
 ```
 
 Then include the SmartRspec module:
 
-``` ruby 
+``` ruby
 RSpec.configure do |config|
   config.include SmartRspec
 end
@@ -50,6 +50,7 @@ end
   * [have_at_most](#have_at_most)
   * [have_error_on](#have_error_on)
   * [include_items](#include_items)
+  * [be_a_list_of](#be_a_list_of)
 
 ### Macros
 
@@ -61,7 +62,7 @@ It builds specs for model attributes and test its type, enumerated values and de
 ``` ruby
 RSpec.describe User, type: :model do
     subject { FactoryGirl.build(:user) }
-    
+
     has_attributes :email, type: :String
     has_attributes :is_admin, type: :Boolean
     has_attributes :score, type: :Integer, default: 0
@@ -75,21 +76,21 @@ It builds specs and test model associations like `belongs_to`, `has_one` and `ha
 ``` ruby
 RSpec.describe User, type: :model do
     subject { FactoryGirl.build(:user) }
-    
+
     belongs_to :business
     has_one :project
     has_many :tasks
 end
 ```
 
-#### fails_validation_of 
+#### fails_validation_of
 
 It builds specs and forces model validations to fail, meaning that you will only turn specs into green when you specify the corresponding validation in the model. In order to get a nice semantics it's recommended to use the `fails_validation_of` macro within a "when invalid" context, like:
 
 ``` ruby
 RSpec.describe User, type: :model do
     subject { FactoryGirl.build(:user) }
-    
+
     context 'when invalid' do
       fails_validation_of :email, presence: true, email: true
       fails_validation_of :name, length: { maximum: 80 }, uniqueness: true
@@ -196,6 +197,11 @@ end
 it { expect(%w(foo bar foobar)).to include_items(%w(foo bar foobar)) }
 ```
 
+#### be_a_list_of
+``` ruby
+it { expect(Foo.fetch_api).to be_a_list_of(Foo)) }
+```
+
 # TODO
 
 - Create macros for model scopes;
@@ -211,4 +217,3 @@ it { expect(%w(foo bar foobar)).to include_items(%w(foo bar foobar)) }
 4. Commit your changes (`git commit -am 'Add some feature'`);
 5. Push to the branch (`git push origin my-new-feature`);
 6. Create new Pull Request.
-

lib/smart_rspec/matchers.rb

@@ -40,6 +40,11 @@ module Matchers
         actual.each_cons(2).all? { |i, j| i >= j  }
       end
     end
+
+    matcher :be_a_list_of do |klass|
+      match do |collection|
+        !collection.map { |object| object.is_a?(klass) }.include?(false)
+      end
+    end
   end
 end
-

spec/smart_rspec/matchers_spec.rb

@@ -140,5 +140,16 @@
       it { expect(%w(foo bar foobar)).not_to include_items(%w(lorem)) }
     end
   end
-end
 
+  describe '#be_a_list_of' do
+    context 'when valid' do
+      subject { [User.new, User.new, User.new] }
+      it { is_expected.to be_a_list_of(User) }
+    end
+
+    context 'when invalid' do
+      subject { [User.new, User.new, String.new] }
+      it { is_expected.to_not be_a_list_of(User) }
+    end
+  end
+end