wrestlingdev.com/test/integration/users_signup_test.rb

require "test_helper"

class UsersSignupTest < ActionDispatch::IntegrationTest
  test "invalid signup information" do
    get signup_path
    assert_no_difference 'User.count' do
      post signup_path, params: { user: { email: "user@invalid",
                                         password: "foo",
                                         password_confirmation: "bar" } }
    end
    assert_template 'users/new'
    assert_select 'div.error_explanation'
    assert_select 'div.alert-danger'
  end

  test "valid signup information" do
    get signup_path
    assert_difference 'User.count', 1 do
      post signup_path, params: { user: { email: "user@example.com",
                                         password: "password",
                                         password_confirmation: "password" } }
    end
    follow_redirect!
    assert_template 'static_pages/home'
    assert session[:user_id].present?
  end
end