instrumental/spec/models/setting_spec.rb

# frozen_string_literal: true

require 'rails_helper'

RSpec.describe Setting do
  describe '#to_param' do
    let(:setting) { Fabricate(:setting, var: var) }
    let(:var)     { 'var' }

    it 'returns setting.var' do
      expect(setting.to_param).to eq var
    end
  end

  describe '.[]' do
    let(:key)         { 'key' }
    let(:cache_key)   { 'cache-key' }
    let(:cache_value) { 'cache-value' }

    before do
      allow(described_class).to receive(:cache_key).with(key).and_return(cache_key)
    end

    context 'when Rails.cache does not exists' do
      before do
        allow(described_class).to receive(:default_settings).and_return(default_settings)

        Fabricate(:setting, var: key, value: 42) if save_setting

        Rails.cache.delete(cache_key)
      end

      let(:default_value)    { 'default_value' }
      let(:default_settings) { { key => default_value } }
      let(:save_setting)     { true }

      context 'when the setting has been saved to database' do
        it 'returns the value from database' do
          callback = double
          allow(callback).to receive(:call)

          ActiveSupport::Notifications.subscribed callback, 'sql.active_record' do
            expect(described_class[key]).to eq 42
          end

          expect(callback).to have_received(:call)
        end
      end

      context 'when the setting has not been saved to database' do
        let(:save_setting) { false }

        it 'returns default_settings[key]' do
          expect(described_class[key]).to be default_settings[key]
        end
      end
    end

    context 'when Rails.cache exists' do
      before do
        Rails.cache.write(cache_key, cache_value)
      end

      it 'does not query the database' do
        callback = double
        allow(callback).to receive(:call)
        ActiveSupport::Notifications.subscribed callback, 'sql.active_record' do
          described_class[key]
        end
        expect(callback).to_not have_received(:call)
      end

      it 'returns the cached value' do
        expect(described_class[key]).to eq cache_value
      end
    end
  end
end