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|
# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Memory::Instrumentation do
include MemoryInstrumentationHelper
before do
skip_memory_instrumentation!
end
describe '.available?' do
it 'returns true' do
expect(described_class).to be_available
end
end
describe '.start_thread_memory_allocations' do
subject { described_class.start_thread_memory_allocations }
context 'when feature flag trace_memory_allocations is enabled' do
before do
stub_feature_flags(trace_memory_allocations: true)
end
it 'a hash is returned' do
is_expected.not_to be_empty
end
end
context 'when feature flag trace_memory_allocations is disabled' do
before do
stub_feature_flags(trace_memory_allocations: false)
end
it 'a nil is returned' do
is_expected.to be_nil
end
end
context 'when feature is unavailable' do
before do
allow(described_class).to receive(:available?) { false }
end
it 'a nil is returned' do
is_expected.to be_nil
end
end
end
describe '.with_memory_allocations' do
let(:ntimes) { 100 }
subject do
described_class.with_memory_allocations do
Array.new(1000).map { '0' * 100 }
end
end
before do
expect(described_class).to receive(:start_thread_memory_allocations).and_call_original
expect(described_class).to receive(:measure_thread_memory_allocations).and_call_original
end
context 'when feature flag trace_memory_allocations is enabled' do
before do
stub_feature_flags(trace_memory_allocations: true)
end
it 'a hash is returned' do
is_expected.to include(
mem_objects: be > 1000,
mem_mallocs: be > 1000,
mem_bytes: be > 100_000 # 100 items * 100 bytes each
)
end
end
context 'when feature flag trace_memory_allocations is disabled' do
before do
stub_feature_flags(trace_memory_allocations: false)
end
it 'a nil is returned' do
is_expected.to be_nil
end
end
context 'when feature is unavailable' do
before do
allow(described_class).to receive(:available?) { false }
end
it 'a nil is returned' do
is_expected.to be_nil
end
end
end
end
|
