95 lines
2.9 KiB
Ruby
95 lines
2.9 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe Gitlab::Database::Count do
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before do
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create_list(:project, 3)
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create(:identity)
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end
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let(:models) { [Project, Identity] }
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describe '.approximate_counts' do
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context 'fallbacks' do
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subject { described_class.approximate_counts(models, strategies: strategies) }
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let(:strategies) do
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[
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double('s1', new: first_strategy),
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double('s2', new: second_strategy)
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]
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end
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let(:first_strategy) { double('first strategy', count: {}) }
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let(:second_strategy) { double('second strategy', count: {}) }
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it 'gets results from first strategy' do
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expect(strategies[0]).to receive(:new).with(models).and_return(first_strategy)
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expect(first_strategy).to receive(:count)
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subject
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end
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it 'gets more results from second strategy if some counts are missing' do
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expect(first_strategy).to receive(:count).and_return({ Project => 3 })
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expect(strategies[1]).to receive(:new).with([Identity]).and_return(second_strategy)
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expect(second_strategy).to receive(:count).and_return({ Identity => 1 })
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expect(subject).to eq({ Project => 3, Identity => 1 })
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end
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it 'does not get more results as soon as all counts are present' do
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expect(first_strategy).to receive(:count).and_return({ Project => 3, Identity => 1 })
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expect(strategies[1]).not_to receive(:new)
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subject
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end
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end
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context 'default strategies' do
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subject { described_class.approximate_counts(models) }
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context 'with a read-only database' do
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before do
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allow(Gitlab::Database).to receive(:read_only?).and_return(true)
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end
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it 'only uses the ExactCountStrategy' do
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allow_next_instance_of(Gitlab::Database::Count::TablesampleCountStrategy) do |instance|
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expect(instance).not_to receive(:count)
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end
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allow_next_instance_of(Gitlab::Database::Count::ReltuplesCountStrategy) do |instance|
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expect(instance).not_to receive(:count)
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end
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expect_next_instance_of(Gitlab::Database::Count::ExactCountStrategy) do |instance|
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expect(instance).to receive(:count).and_return({})
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end
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subject
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end
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end
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context 'with a read-write database' do
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before do
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allow(Gitlab::Database).to receive(:read_only?).and_return(false)
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end
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it 'uses the available strategies' do
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[
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Gitlab::Database::Count::TablesampleCountStrategy,
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Gitlab::Database::Count::ReltuplesCountStrategy,
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Gitlab::Database::Count::ExactCountStrategy
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].each do |strategy_klass|
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expect_next_instance_of(strategy_klass) do |instance|
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expect(instance).to receive(:count).and_return({})
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end
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end
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subject
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end
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end
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end
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end
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end
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