From 604dd25ef54c617fbec9e4ed0b7c3ed3f0e715a6 Mon Sep 17 00:00:00 2001
From: Francisco Martins <franciscomxs@gmail.com>
Date: Tue, 17 Mar 2015 15:04:15 -0300
Subject: [PATCH] Add matcher be_a_list_of

---
 README.md                         | 19 ++++++++++++-------
 lib/smart_rspec/matchers.rb       |  7 ++++++-
 spec/smart_rspec/matchers_spec.rb | 13 ++++++++++++-
 3 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/README.md b/README.md
index 1f8cecb..6b95f90 100644
--- a/README.md
+++ b/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.
-
diff --git a/lib/smart_rspec/matchers.rb b/lib/smart_rspec/matchers.rb
index 3e55e2d..b93ef83 100644
--- a/lib/smart_rspec/matchers.rb
+++ b/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
-
diff --git a/spec/smart_rspec/matchers_spec.rb b/spec/smart_rspec/matchers_spec.rb
index 194b260..6abbfa7 100644
--- a/spec/smart_rspec/matchers_spec.rb
+++ b/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