Rails and Rspec Unit Testing Static Methods - ruby-on-rails

Question

I have a very simple static method in one of my models:
def self.default
self.find(1)
end
I'm trying to write a simple Rspec unit test for it that doesn't make any calls to the DB. How do I write a test that generates a few sample instances for the test to return? Feel free to complete this:
describe ".default" do
context "when testing the default static method" do
it "should return the instance where id = 1" do
end
end
end
The model file is as follows:
class Station < ApplicationRecord
acts_as_paranoid
acts_as_list
nilify_blanks
belongs_to :color
has_many :jobs
has_many :station_stops
has_many :logs, -> { where(applicable_class: :Station) }, foreign_key: :applicable_id
has_many :chattels, -> { where(applicable_class: :Station) }, foreign_key: :applicable_id
delegate :name, :hex, to: :color, prefix: true
def name
"#{full_display} Station"
end
def small_display
display_short || code.try(:titleize)
end
def full_display
display_long || small_display
end
def average_time
Time.at(station_stops.closed.average(:time_lapsed)).utc.strftime("%-M:%S")
end
def self.default
# referencing migrate/create_stations.rb default for jobs
self.find(1)
end
def self.first
self.where(code: Constant.get('station_code_to_enter_lab')).first
end
end
The spec file is as follows:
require "rails_helper"
describe Station do
subject { described_class.new }
describe "#name" do
context "when testing the name method" do
it "should return the capitalized code with spaces followed by 'Station'" do
newStation = Station.new(code: 'back_to_school')
result = newStation.name
expect(result).to eq 'Back To School Station'
end
end
end
describe "#small_display" do
context "when testing the small_display method" do
it "should return the capitalized code with spaces" do
newStation = Station.new(code: 'back_to_school')
result = newStation.small_display
expect(result).to eq 'Back To School'
end
end
end
describe "#full_display" do
context "when testing the full_display method" do
it "should return the capitalized code with spaces" do
newStation = Station.new(code: 'back_to_school')
result = newStation.full_display
expect(result).to eq 'Back To School'
end
end
end
describe ".default" do
context "" do
it "" do
end
end
end
end

Answer 1

You can use stubbing to get you there
describe ".default" do
context "when testing the default static method" do
let(:dummy_station) { Station.new(id: 1) }
before { allow(Station).to receive(:default).and_return(dummy_station)
it "should return the instance where id = 1" do
expect(Station.default.id).to eq 1
end
end
end