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# frozen_string_literal: true
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 do |x|
m.measure(x)
end
f2 = Time.now.gmtime.to_f * 1_000_000
_(m.sampling_start_time).must_be :>=, f1
_(m.sampling_start_time).must_be :<, f2
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 do |x|
m.measure(x)
end
f2 = Time.now.gmtime.to_f * 1_000_000
_(m.sampling_stop_time).must_be :>, f1
_(m.sampling_stop_time).must_be :<=, f2
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({})
_(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 -= ["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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