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require 'spec_helper'
describe Gitlab::Metrics::Samplers::RubySampler do
let(:sampler) { described_class.new(5) }
after do
Allocations.stop if Gitlab::Metrics.mri?
end
describe '#sample' do
it 'samples various statistics' do
expect(Gitlab::Metrics::System).to receive(:memory_usage)
expect(Gitlab::Metrics::System).to receive(:file_descriptor_count)
expect(sampler).to receive(:sample_gc)
sampler.sample
end
it 'adds a metric containing the memory usage' do
expect(Gitlab::Metrics::System).to receive(:memory_usage)
.and_return(9000)
expect(sampler.metrics[:memory_usage]).to receive(:set)
.with({}, 9000)
.and_call_original
sampler.sample
end
it 'adds a metric containing the amount of open file descriptors' do
expect(Gitlab::Metrics::System).to receive(:file_descriptor_count)
.and_return(4)
expect(sampler.metrics[:file_descriptors]).to receive(:set)
.with({}, 4)
.and_call_original
sampler.sample
end
it 'clears any GC profiles' do
expect(GC::Profiler).to receive(:clear)
sampler.sample
end
end
describe '#sample_gc' do
it 'adds a metric containing garbage collection time statistics' do
expect(GC::Profiler).to receive(:total_time).and_return(0.24)
expect(sampler.metrics[:total_time]).to receive(:set)
.with({}, 240)
.and_call_original
sampler.sample
end
it 'adds a metric containing garbage collection statistics' do
GC.stat.keys.each do |key|
expect(sampler.metrics[key]).to receive(:set).with({}, anything).and_call_original
end
sampler.sample
end
end
end
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