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require File.join(File.dirname(__FILE__), '..', 'spec_helper')
describe JoinOperation, 'between two relations' do
before do
@relation1 = TableRelation.new(:foo)
@relation2 = TableRelation.new(:bar)
end
describe JoinOperation, '==' do
it "obtains if the relations of both joins are identical" do
JoinOperation.new(@relation1, @relation2).should == JoinOperation.new(@relation1, @relation2)
JoinOperation.new(@relation1, @relation2).should_not == JoinOperation.new(@relation1, @relation1)
end
it "is commutative on the relations" do
JoinOperation.new(@relation1, @relation2).should == JoinOperation.new(@relation2, @relation1)
end
end
describe JoinOperation, 'on' do
before do
@predicate = Predicate.new
end
it "manufactures a JoinRelation" do
JoinOperation.new(@relation1, @relation2).on(@predicate).should == JoinRelation.new(@relation1, @relation2, @predicate)
end
end
end
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