Rails minitest BCrypt::Errors::InvalidHash:

Question

I've been following Hartl's Rails Tutorial and I am implementing minitests to my Login. Currently, everything works fine, and the user is able to login successfully.

But when I run the test on my Login Integration, I keep getting this error when I try to digest the token....

BCrypt::Errors::InvalidHash: invalid hash
  app/controllers/sessions_controller.rb:13:in `create'
  test/integration/users_login_test.rb:21:in `block in <class:UsersLoginTest>'
  app/controllers/sessions_controller.rb:13:in `create'
  test/integration/users_login_test.rb:21:in `block in <class:UsersLoginTest>'

Can someone help me understand this error and how I may be able to fix it please.

Model

class User < ActiveRecord::Base
  belongs_to :district
  belongs_to :school

  ###Why doesn't this work?------
  def User.digest(token)
    Digest::SHA1.hexdigest(token.to_s)
  end

end

Fixtures (users.yml)

tom:
  district_id: 1
  school_id: 6
  firstName: Tommy
  lastName: Pickles
  username: pickleman
  email: [email protected]

  ###Error on this line------
  password_digest: <%= User.digest('password') %>

Integration(user_login_test.rb)

require 'test_helper'

class UsersLoginTest < ActionDispatch::IntegrationTest

  def setup
    @user = users(:tom)
  end

  test "login with valid information" do
    get login_path

    ###Error on Sign Up Here------
    post sessions_path, session: { username: @user.username, password: 'password' }

    assert_redirected_to district_district_resources_path(@user.district)
    follow_redirect!
    assert_template 'sessions/new'
    assert_select "a[href=?]", login_path, count: 0
  end

end

Controller

class SessionsController < ApplicationController

  #create session for login
  def create
    user = User.find_by(username: params[:session][:username]) if defined? params[:session][:username]  
    district = user.district if user
    school = user.school if user

    if user && user.authenticate(params[:session][:password]) && district
        user_sign_in user
        redirect_to district_district_resources_path(district)
    else
        flash.now[:error] = 'Invalid username / password combination' # Not quite right!
        render 'new'
    end

end

Answer 1

Found a work around.

Created a user with the password: password

I then directly added the password_digest that was generated into the users.yml for minitest to work.

users.yml

tom:
  district_id: 1
  school_id: 6
  firstName: Tommy
  lastName: Pickles
  username: pickleman
  email: [email protected]

  ###HERE----
  password_digest: $2a$10$g/A4D6KtaLtxvm2lZ8C.vuPvl8Zu2TrbnPYpM6r59Wu397hlY42GO