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Versions: 5
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Contents
require 'spec_helper'
module Alf
describe Aggregator do
let(:input){[
{:a => 1, :sign => -1},
{:a => 2, :sign => 1 },
{:a => 3, :sign => -1},
{:a => 1, :sign => -1},
]}
it "should keep track of registered aggregators" do
Aggregator.aggregators.should_not be_empty
Aggregator.each do |agg|
agg.should be_a(Class)
end
end
it "should allow specific tuple computations" do
Aggregator.sum{ 1.0 * a * sign }.aggregate(input).should == -3.0
end
describe "coerce" do
subject{ Aggregator.coerce(arg) }
describe "from an Aggregator" do
let(:arg){ Aggregator.sum{a} }
it{ should eq(arg) }
end
describe "from a String" do
let(:arg){ "sum{a}" }
it {
should be_a(Aggregator::Sum)
}
it 'should have source code' do
subject.has_source_code!.should eq("sum{a}")
end
specify{
subject.aggregate(input).should eql(7)
}
end
end
it 'should implement optimistic equality based on source code' do
ag1 = Aggregator.coerce("sum{ qty }")
ag2 = Aggregator.coerce("sum{ qty }")
ag1.should eq(ag2)
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems