testing/rspec/spec/dsl_spec.rb in cql-1.3.0 vs testing/rspec/spec/dsl_spec.rb in cql-1.4.0

@@ -181,24 +181,58 @@
 
         base_result = gs.query do
           select :self
           select name
           select :self
+          as 'foo', 'bar', 'baz'
           from scenarios
         end
 
 
         expect(
             gs.query do
               select
               select name
               select
+              as 'foo', 'bar', 'baz'
               from scenarios
             end
         ).to eq(base_result)
       end
 
     end
+
+
+    describe 'duplicate selections' do
+
+      let(:warning_message) { "Multiple selections made without using an 'as' clause\n" }
+
+      it "warns if the same attribute is selected more than once without an 'as' clause being used" do
+        gs = CQL::Repository.new("#{@feature_fixtures_directory}/scenario/simple")
+
+        expect {
+          gs.query do
+            select :model, :model, :model
+            from :all
+          end
+        }.to output(warning_message).to_stderr
+      end
+
+      it "does not warn if the same attribute is selected more than once and an 'as' clause is used" do
+        gs = CQL::Repository.new("#{@feature_fixtures_directory}/scenario/simple")
+
+        expect {
+          gs.query do
+            select :model, :model, :model
+            # Usage of the clause is sufficient. Not going to try and count the mappings or anything like that.
+            as foo
+            from :all
+          end
+        }.to_not output(warning_message).to_stderr
+      end
+
+    end
+
   end
 
   describe "from" do
 
     it 'knows from what to select attributes' do