rspec_demo.rb

describe User do
  
  # The test suite adds a #stub() method to every object. Since instances of objects
  # and class definitions are considered objects in Ruby, the #stub() method gets 
  # applied just about everywhere. It can be used to stub both instance methods and
  # class methods.
  
  it "can have tests that hit a database" do
    user = User.find(1) # This test will go to the database
    expect(user.username).to eq("admin")
  end
  
  it "can have tests that are stubbed" do
    User.stub(:find) do |id|
      User.new { id: id, username: "user-#{id}" }
    end
    user = User.find(123)
    expect(user.username).to eq("user-123") # This has been stubbed
  end
  
end