gitlab-org--gitlab-foss/spec/initializers/database_config_spec.rb

71 lines
1.9 KiB
Ruby

# frozen_string_literal: true
require 'spec_helper'
RSpec.describe 'Database config initializer' do
subject do
load Rails.root.join('config/initializers/database_config.rb')
end
before do
allow(ActiveRecord::Base).to receive(:establish_connection)
allow(Gitlab::Runtime).to receive(:max_threads).and_return(max_threads)
end
let(:max_threads) { 8 }
context "no existing pool size is set" do
before do
stub_database_config(pool_size: nil)
end
it "sets it based on the max number of worker threads" do
expect { subject }.to change { Gitlab::Database.config['pool'] }.from(nil).to(18)
end
end
context "the existing pool size is smaller than the max number of worker threads" do
before do
stub_database_config(pool_size: 1)
end
it "sets it based on the max number of worker threads" do
expect { subject }.to change { Gitlab::Database.config['pool'] }.from(1).to(18)
end
end
context "and the existing pool size is larger than the max number of worker threads" do
before do
stub_database_config(pool_size: 100)
end
it "sets it based on the max number of worker threads" do
expect { subject }.to change { Gitlab::Database.config['pool'] }.from(100).to(18)
end
end
context "when specifying headroom through an ENV variable" do
let(:headroom) { 15 }
before do
stub_database_config(pool_size: 1)
stub_env("DB_POOL_HEADROOM", headroom)
end
it "adds headroom on top of the calculated size" do
expect { subject }.to change { Gitlab::Database.config['pool'] }
.from(1)
.to(max_threads + headroom)
end
end
def stub_database_config(pool_size:)
config = {
'adapter' => 'postgresql',
'host' => 'db.host.com',
'pool' => pool_size
}.compact
allow(Gitlab::Database).to receive(:config).and_return(config)
end
end