1 files changed, 26 insertions, 0 deletions
diff --git a/spec/arel/algebra/unit/relations/join_spec.rb b/spec/arel/algebra/unit/relations/join_spec.rb
new file mode 100644
index 0000000000..f5a8bd32aa
--- /dev/null
+++ b/spec/arel/algebra/unit/relations/join_spec.rb
@@ -0,0 +1,26 @@
+require File.join(File.dirname(__FILE__), '..', '..', '..', '..', 'spec_helper')
+
+module Arel
+  describe Join do
+    before do
+      @relation1 = Table.new(:users)
+      @relation2 = Table.new(:photos)
+      @predicate = @relation1[:id].eq(@relation2[:user_id])
+    end
+
+    describe 'hashing' do
+      it 'implements hash equality' do
+        InnerJoin.new(@relation1, @relation2, @predicate) \
+          .should hash_the_same_as(InnerJoin.new(@relation1, @relation2, @predicate))
+      end
+    end
+
+    describe '#attributes' do
+      it 'combines the attributes of the two relations' do
+        join = InnerJoin.new(@relation1, @relation2, @predicate)
+        join.attributes.should ==
+          (@relation1.attributes + @relation2.attributes).collect { |a| a.bind(join) }
+      end
+    end
+  end
+end