Adds better reusable error message support. Added to fetching remote

posts. /cc @riking

spec/components/json_error_spec.rb

@@ -0,0 +1,55 @@
+require 'spec_helper'
+require_dependency 'json_error'
+
+shared_examples "a generic error" do
+  let(:result) { creator.create_errors_json(obj) }
+
+  it "should have a result object" do
+    result.should be_present
+  end
+
+  it "has a generic error message" do
+    result[:errors].should == [I18n.t('js.generic_error')]
+  end
+end
+
+describe JsonError do
+
+  let(:creator) { Object.new.extend(JsonError) }
+
+  describe "with a nil argument" do
+    it_behaves_like "a generic error" do
+      let(:obj) { nil }
+    end
+  end
+
+  describe "with an empty array" do
+    it_behaves_like "a generic error" do
+      let(:obj) { [] }
+    end
+  end
+
+  describe "with an activerecord object with no errors" do
+    it_behaves_like "a generic error" do
+      let(:obj) { Fabricate.build(:user) }
+    end
+  end
+
+  describe "with a string" do
+    it "returns the string in the error format" do
+      creator.create_errors_json("test error").should == {errors: ["test error"]}
+    end
+  end
+
+  describe "an activerecord objec with errors" do
+    let(:invalid_user) { User.new }
+    it "returns the errors correctly" do
+      invalid_user.should_not be_valid
+      result = creator.create_errors_json(invalid_user)
+      result.should be_present
+      result[:errors].should_not be_blank
+    end
+  end
+
+end
+