1 files changed, 29 insertions, 0 deletions
diff --git a/test/test_expressions.rb b/test/test_expressions.rb
new file mode 100644
index 0000000000..d061bbc335
--- /dev/null
+++ b/test/test_expressions.rb
@@ -0,0 +1,29 @@
+require 'helper'
+
+module Arel
+  describe "Expressions" do
+    before do
+      @table = Table.new(:users)
+    end
+
+    describe "average" do
+      it "aliases the average as avg_id by default" do
+        @table[:score].average.to_sql.must_be_like %{
+          AVG("users"."score") AS avg_id
+        }
+      end
+
+      it "aliases the average as another string" do
+        @table[:score].average("my_alias").to_sql.must_be_like %{
+          AVG("users"."score") AS my_alias
+        }
+      end
+
+      it "omits the alias if nil" do
+        @table[:score].average(nil).to_sql.must_be_like %{
+          AVG("users"."score")
+        }
+      end
+    end
+  end
+end