1 files changed, 34 insertions, 0 deletions
diff --git a/spec/arel/algebra/unit/relations/project_spec.rb b/spec/arel/algebra/unit/relations/project_spec.rb
new file mode 100644
index 0000000000..b71acf5e91
--- /dev/null
+++ b/spec/arel/algebra/unit/relations/project_spec.rb
@@ -0,0 +1,34 @@
+require File.join(File.dirname(__FILE__), '..', '..', '..', '..', 'spec_helper')
+
+module Arel
+  describe Project do
+    before do
+      @relation = Table.new(:users)
+      @attribute = @relation[:id]
+    end
+    
+    describe '#attributes' do
+      before do
+        @projection = Project.new(@relation, @attribute)
+      end
+      
+      it "manufactures attributes associated with the projection relation" do
+        @projection.attributes.should == [@attribute].collect { |a| a.bind(@projection) }
+      end
+    end
+    
+    describe '#externalizable?' do
+      describe 'when the projections are attributes' do
+        it 'returns false' do
+          Project.new(@relation, @attribute).should_not be_externalizable
+        end
+      end
+      
+      describe 'when the projections include an aggregation' do
+        it "obtains" do
+          Project.new(@relation, @attribute.sum).should be_externalizable
+        end
+      end
+    end
+  end
+end
+\ No newline at end of file