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require 'spec_helper'
RSpec.describe Jaeger::Samplers::GuaranteedThroughputProbabilistic do
let(:sampler) do
described_class.new(
lower_bound: lower_bound,
rate: rate,
lower_bound_sampler: lower_bound_sampler
)
end
let(:lower_bound) { 5 }
let(:rate) { 0.5 }
let(:lower_bound_sampler) { instance_double(Jaeger::Samplers::RateLimiting) }
let(:max_traces_per_second) { 10 }
let(:sample_args) { { trace_id: trace_id } }
let(:sample_result) { sampler.sample(**sample_args) }
let(:is_sampled) { sample_result[0] }
let(:tags) { sample_result[1] }
context 'when rate is set to 0' do
let(:rate) { 0 }
let(:trace_id) { Jaeger::TraceId.generate }
context 'when lower bound return false' do
before do
allow(lower_bound_sampler).to receive(:sample)
.and_return([false, {}])
end
it 'returns false for every trace' do
expect(is_sampled).to eq(false)
end
it 'returns tags with param 0' do
expect(tags).to eq(
'sampler.type' => 'lowerbound',
'sampler.param' => rate
)
end
end
context 'when lower bound sampler returns true' do
before do
allow(lower_bound_sampler).to receive(:sample)
.and_return([true, {}])
end
it 'returns true' do
expect(is_sampled).to eq(true)
end
it 'returns tags with lower bound param' do
expect(tags).to eq(
'sampler.type' => 'lowerbound',
'sampler.param' => rate
)
end
end
end
context 'when rate is set to 1' do
let(:rate) { 1 }
let(:trace_id) { Jaeger::TraceId.generate }
before do
allow(lower_bound_sampler).to receive(:sample)
end
it 'returns true for every trace' do
expect(is_sampled).to eq(true)
end
it 'returns tags with param 1' do
expect(tags).to eq(
'sampler.type' => 'probabilistic',
'sampler.param' => rate
)
end
it 'calls lower bound sampler' do
expect(lower_bound_sampler).to receive(:sample).with(sample_args)
is_sampled
end
end
end
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