69 lines
2.1 KiB
Ruby
69 lines
2.1 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe Gitlab::Database::Migrations::Observers::QueryStatistics do
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subject { described_class.new(observation, double("unused path"), connection) }
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let(:observation) { Gitlab::Database::Migrations::Observation.new }
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let(:connection) { ActiveRecord::Migration.connection }
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def mock_pgss(enabled: true)
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if enabled
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allow(subject).to receive(:function_exists?).with(:pg_stat_statements_reset).and_return(true)
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allow(connection).to receive(:view_exists?).with(:pg_stat_statements).and_return(true)
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else
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allow(subject).to receive(:function_exists?).with(:pg_stat_statements_reset).and_return(false)
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allow(connection).to receive(:view_exists?).with(:pg_stat_statements).and_return(false)
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end
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end
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describe '#before' do
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context 'with pgss available' do
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it 'resets pg_stat_statements' do
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mock_pgss(enabled: true)
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expect(connection).to receive(:execute).with('select pg_stat_statements_reset()').once
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subject.before
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end
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end
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context 'without pgss available' do
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it 'executes nothing' do
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mock_pgss(enabled: false)
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expect(connection).not_to receive(:execute)
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subject.before
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end
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end
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end
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describe '#record' do
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let(:result) { double }
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let(:pgss_query) do
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<<~SQL
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SELECT query, calls, total_time, max_time, mean_time, rows
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FROM pg_stat_statements
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ORDER BY total_time DESC
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SQL
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end
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context 'with pgss available' do
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it 'fetches data from pg_stat_statements and stores on the observation' do
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mock_pgss(enabled: true)
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expect(connection).to receive(:execute).with(pgss_query).once.and_return(result)
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expect { subject.record }.to change { observation.query_statistics }.from(nil).to(result)
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end
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end
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context 'without pgss available' do
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it 'executes nothing' do
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mock_pgss(enabled: false)
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expect(connection).not_to receive(:execute)
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expect { subject.record }.not_to change { observation.query_statistics }
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end
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end
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end
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end
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