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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Database::Migrations::Observers::TotalDatabaseSizeChange do
subject { described_class.new }
let(:observation) { Gitlab::Database::Migrations::Observation.new }
let(:connection) { ActiveRecord::Base.connection }
let(:query) { 'select pg_database_size(current_database())' }
it 'records the size change' do
expect(connection).to receive(:execute).with(query).once.and_return([{ 'pg_database_size' => 1024 }])
expect(connection).to receive(:execute).with(query).once.and_return([{ 'pg_database_size' => 256 }])
subject.before
subject.after
subject.record(observation)
expect(observation.total_database_size_change).to eq(256 - 1024)
end
context 'out of order calls' do
before do
allow(connection).to receive(:execute).with(query).and_return([{ 'pg_database_size' => 1024 }])
end
it 'does not record anything if before size is unknown' do
subject.after
expect { subject.record(observation) }.not_to change { observation.total_database_size_change }
end
it 'does not record anything if after size is unknown' do
subject.before
expect { subject.record(observation) }.not_to change { observation.total_database_size_change }
end
end
end
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