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Contents
require 'spec_helper'
describe "Reducers" do
describe :moments do
include_context "reducers"
it_behaves_like 'a processor', :named => :moments
it "behaves like group when not called with any arguments" do
processor(:moments).given(*strings.sort).should emit(
{group: 'apple', count: 2, results: {}},
{group: 'banana', count: 1, results: {}},
{group: 'cookie', count: 1, results: {}}
)
end
it "behaves calculates the moments of numeric fields" do
processor(:moments, group_by: 'outer', of: 'data.n').given(*json_sorted_outer).should emit(
{group: nil, count: 2, results: {"data.n" => {}}},
{group: 'apple', count: 2, results: {"data.n"=>{:count=>2, :mean=>3.0, :std_dev=>2.0}}},
{group: 'banana', count: 1, results: {"data.n"=>{:count=>1, :mean=>100.0, :std_dev=>0.0}}},
{group: 'cookie', count: 1, results: {"data.n"=>{:count=>1, :mean=>10.0, :std_dev=>0.0}}}
)
end
it "will leave off the standard deviation if desired" do
processor(:moments, group_by: 'outer', of: 'data.n', no_std_dev: true).given(*json_sorted_outer).should emit(
{group: nil, count: 2, results: {"data.n" => {}}},
{group: 'apple', count: 2, results: {"data.n"=>{:count=>2, :mean=>3.0 }}},
{group: 'banana', count: 1, results: {"data.n"=>{:count=>1, :mean=>100.0 }}},
{group: 'cookie', count: 1, results: {"data.n"=>{:count=>1, :mean=>10.0 }}}
)
end
end
end
Version data entries
5 entries across 5 versions & 2 rubygems