database_configuration_spec.rb

require 'tempfile'

RSpec.describe "DatabaseConfiguration patch" do
  let(:db_config_path) { File.expand_path "../../../config/database.yml", __dir__ }
  let(:fake_db_config) { Pathname.new("does/not/exist") }

  before do
    allow(ManageIQ).to receive_messages(:env => ActiveSupport::StringInquirer.new("production"))

    @app = Vmdb::Application.new
    @app.config.paths["config/database"] = fake_db_config.to_s # ignore real database.yml
  end

  context "ERB in the template" do
    it "doesn't execute" do
      Tempfile.create do |database_config|
        database_config.write("---\nvalue: <%= 1 %>\n")
        database_config.flush

        allow(Pathname).to receive(:new).with(db_config_path).and_return(Pathname.new(database_config.path))
        expect(@app.config.database_configuration).to eq('value' => '<%= 1 %>')
      end
    end
  end

  context "when DATABASE_URL is set" do
    around(:each) do |example|

      old_env = ENV.delete('DATABASE_URL')
      ENV['DATABASE_URL'] = 'postgres://'
      example.run
    ensure
      # ENV['x'] = nil deletes the key because ENV accepts only string values
      ENV['DATABASE_URL'] = old_env

    end

    it "ignores a missing file" do
      expect(Pathname).to receive(:new).with(db_config_path).and_return(fake_db_config)
      expect(@app.config.database_configuration).to eq({})
    end
  end

  context "with no source of configuration" do
    it "explains the problem" do
      expect(Pathname).to receive(:new).with(db_config_path).and_return(fake_db_config)

      begin
        old = ENV.delete('DATABASE_URL')
        expect { @app.config.database_configuration }.to raise_error(/Could not load database configuration/)
      ensure
        # ENV['x'] = nil deletes the key because ENV accepts only string values
        ENV['DATABASE_URL'] = old
      end
    end
  end
end