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require 'spec_helper'
require 'json'
describe Hitimes::Stats do
before( :each ) do
@stats = Hitimes::Stats.new
@full_stats = Hitimes::Stats.new
[ 1, 2, 3].each { |i| @full_stats.update( i ) }
end
it "is initialized with 0 values" do
@stats.count.must_equal 0
@stats.min.must_equal 0.0
@stats.max.must_equal 0.0
@stats.sum.must_equal 0.0
@stats.rate.must_equal 0.0
end
it "calculates the mean correctly" do
@full_stats.mean.must_equal 2.0
end
it "calculates the rate correctly" do
@full_stats.rate.must_equal 0.5
end
it "tracks the maximum value" do
@full_stats.max.must_equal 3.0
end
it "tracks the minimum value" do
@full_stats.min.must_equal 1.0
end
it "tracks the count" do
@full_stats.count.must_equal 3
end
it "tracks the sum" do
@full_stats.sum.must_equal 6.0
end
it "calculates the standard deviation" do
@full_stats.stddev.must_equal 1.0
end
it "calculates the sum of squares " do
@full_stats.sumsq.must_equal 14.0
end
describe "#to_hash " do
it "converts to a Hash" do
h = @full_stats.to_hash
h.size.must_equal ::Hitimes::Stats::STATS.size
h.keys.sort.must_equal ::Hitimes::Stats::STATS
end
it "converts to a limited Hash if given arguments" do
h = @full_stats.to_hash( "min", "max", "mean" )
h.size.must_equal 3
h.keys.sort.must_equal %w[ max mean min ]
h = @full_stats.to_hash( %w[ count rate ] )
h.size.must_equal 2
h.keys.sort.must_equal %w[ count rate ]
end
it "raises NoMethodError if an invalid stat is used" do
lambda { @full_stats.to_hash( "wibble" ) }.must_raise( NoMethodError )
end
end
describe "#to_json" do
it "converts to a json string" do
j = @full_stats.to_json
h = JSON.parse( j )
h.size.must_equal ::Hitimes::Stats::STATS.size
h.keys.sort.must_equal ::Hitimes::Stats::STATS
end
it "converts to a limited Hash if given arguments" do
j = @full_stats.to_json( "min", "max", "mean" )
h = JSON.parse( j )
h.size.must_equal 3
h.keys.sort.must_equal %w[ max mean min ]
j = @full_stats.to_json( %w[ count rate ] )
h = JSON.parse( j )
h.size.must_equal 2
h.keys.sort.must_equal %w[ count rate ]
end
it "raises NoMethodError if an invalid stat is used" do
lambda { @full_stats.to_json( "wibble" ) }.must_raise( NoMethodError )
end
end
end
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