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require 'spec_helper'
describe Gitlab::Database::Count do
before do
create_list(:project, 3)
create(:identity)
end
let(:models) { [Project, Identity] }
context '.approximate_counts' do
context 'selecting strategies' do
let(:strategies) { [double('s1', enabled?: true), double('s2', enabled?: false)] }
it 'uses only enabled strategies' do
expect(strategies[0]).to receive(:new).and_return(double('strategy1', count: {}))
expect(strategies[1]).not_to receive(:new)
described_class.approximate_counts(models, strategies: strategies)
end
end
context 'fallbacks' do
subject { described_class.approximate_counts(models, strategies: strategies) }
let(:strategies) do
[
double('s1', enabled?: true, new: first_strategy),
double('s2', enabled?: true, new: second_strategy)
]
end
let(:first_strategy) { double('first strategy', count: {}) }
let(:second_strategy) { double('second strategy', count: {}) }
it 'gets results from first strategy' do
expect(strategies[0]).to receive(:new).with(models).and_return(first_strategy)
expect(first_strategy).to receive(:count)
subject
end
it 'gets more results from second strategy if some counts are missing' do
expect(first_strategy).to receive(:count).and_return({ Project => 3 })
expect(strategies[1]).to receive(:new).with([Identity]).and_return(second_strategy)
expect(second_strategy).to receive(:count).and_return({ Identity => 1 })
expect(subject).to eq({ Project => 3, Identity => 1 })
end
it 'does not get more results as soon as all counts are present' do
expect(first_strategy).to receive(:count).and_return({ Project => 3, Identity => 1 })
expect(strategies[1]).not_to receive(:new)
subject
end
end
end
end
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