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require 'spec_helper'
describe Hitimes::ValueMetric do
before( :each ) do
@metric = Hitimes::ValueMetric.new( "testing" )
10.times { |x| @metric.measure( x ) }
end
it 'has a name' do
@metric.name.must_equal "testing"
end
it "has associated data from initialization" do
m = Hitimes::ValueMetric.new( "more-data", 'foo' => 'bar', 'this' => 'that' )
m.additional_data['foo'].must_equal 'bar'
m.additional_data['this'].must_equal 'that'
m = Hitimes::ValueMetric.new( "more-data", { 'foo' => 'bar', 'this' => 'that' } )
m.additional_data['foo'].must_equal 'bar'
m.additional_data['this'].must_equal 'that'
end
it "calculates the mean of the measurements" do
@metric.mean.must_equal 4.5
end
it "calculates the stddev of the measurements" do
@metric.stddev.must_be :>, 0.0
end
it "returns 0.0 for stddev if there is no data" do
m = Hitimes::ValueMetric.new('0-data')
m.stddev.must_equal 0.0
end
it "keeps track of the sum of data" do
@metric.sum.must_equal 45.0
end
it "keeps track of the sum of squars of data" do
@metric.sumsq.must_equal 285.0
end
it "retuns 0.0 for mean if there is no data" do
Hitimes::ValueMetric.new('0-data').mean.must_equal 0.0
end
it "keeps track of the min value" do
@metric.min.must_equal 0
end
it "keeps track of the max value" do
@metric.max.must_equal 9
end
it "keeps track of the first start time of all the measurements" do
m = Hitimes::ValueMetric.new( "first-start-time" )
f1 = Time.now.gmtime.to_f * 1_000_000
10.times{ |x| m.measure( x ); sleep 0.1 }
f2 = Time.now.gmtime.to_f * 1_000_000
m.sampling_start_time.must_be :>=, f1
m.sampling_start_time.must_be :<, f2
# distance from now to start time should be greater than the distance from
# the start to the min start_time
(f2 - m.sampling_start_time).must_be :>, ( m.sampling_start_time - f1 )
end
it "keeps track of the last stop time of all the intervals" do
m = Hitimes::ValueMetric.new( "last-stop-time" )
f1 = Time.now.gmtime.to_f * 1_000_000
10.times {|x| m.measure( x ); sleep 0.1 }
f2 = Time.now.gmtime.to_f * 1_000_000
m.sampling_stop_time.must_be :>, f1
m.sampling_stop_time.must_be :<=, f2
# distance from now to max stop time time should be less than the distance
# from the start to the max stop time
(f2 - m.sampling_stop_time).must_be :<, ( m.sampling_stop_time - f1 )
end
describe "#to_hash" do
it "has name value" do
h = @metric.to_hash
h['name'].must_equal "testing"
end
it "has an empty has for additional_data" do
h = @metric.to_hash
h['additional_data'].must_equal Hash.new
h['additional_data'].size.must_equal 0
end
it "has the right sum" do
h = @metric.to_hash
h['sum'].must_equal 45
end
fields = ::Hitimes::Stats::STATS.dup + %w[ name additional_data sampling_start_time sampling_stop_time ]
fields = fields - [ 'rate' ]
fields.each do |f|
it "has a value for #{f}" do
h = @metric.to_hash
h[f].wont_be_nil
end
end
end
end
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