$ bundle exec rake test TEST=test/integration/users_login_test.rb
>                       TESTOPTS="--name test_login_with_valid_information"

#michael:
  name: Michael Example
  email: michael@example.com
  password_digest: <%= User.digest('password') %>

require 'test_helper'

class UsersLoginTest < ActionDispatch::IntegrationTest

  def setup
    @user = users(:michael)
  end

  test "login with invalid information" do
    get login_path
    assert_template 'sessions/new'
    post login_path, session: { email: "", password: "" }
    assert_template 'sessions/new'
    assert_not flash.empty?
    get root_path
    assert flash.empty?
  end

  test "login with valid information" do
    get login_path
    post login_path, session: { email: @user.email, password: 'password' }
    assert_redirected_to @user
    follow_redirect!
    assert_template 'users/show'
    assert_select "a[href=?]", login_path, count: 0
    assert_select "a[href=?]", logout_path
    assert_select "a[href=?]", user_path(@user)
  end

end

#michael:
  name: Michael Example
  email: michael@example.com
  password_digest: <%= User.digest('password') %>