■エラーが発生した状況

• spec/requests/albums_spec.rb

require 'rails_helper'

RSpec.describe "Albums", type: :request do
  let!(:user) { create(:user) }

  ・・・

  describe 'POST /albums' do
    ・・・

    context 'ログインしている場合' do
      before do
        sign_in user
      end

      it '記事が保存される' do
        album_params = {
          title: album.title,
          title: Faker::Lorem.characters(number: 10),
          pictures: [picture1, picture2]
        }
        post albums_path**({album: album_params})**
        ・・・
      end
    end
  end
end

• app/controllers/albums_controller.rb

class AlbumsController < ApplicationController
  before_action :authenticate_user!, only: [:new, :create, :edit, :update, :destroy]

  def create
    @album = current_user.albums.build(album_params)
    if @album.save
      redirect_to album_path(@album), notice: '保存できたよ'
    else
      flash.now[:error] = '保存に失敗しました'
      render :new
    end
  end

  private

  def album_params
    params.require(:album).permit(:title, pictures: [])
  end
end

■エラーの内容

Since there is no EDITOR or BETTER_ERRORS_EDITOR environment variable, using Textmate by default.
F

Failures:

  1) Albums POST /albums ログインしている場合 記事が保存される
     **Failure/Error: expect(response).to have_http_status(302)
       expected the response to have status code 302 but it was 500**
     # ./spec/requests/albums_spec.rb:33:in `block (4 levels) in <top (required)>'

Finished in 3.05 seconds (files took 1.61 seconds to load)
2 examples, 1 failure

Failed examples:

rspec ./spec/requests/albums_spec.rb:25 # Albums POST /albums ログインしている場合 記事が保存される

■エラーの原因調査

• app/controllers/albums_controller.rb binding.pryをセット

class AlbumsController < ApplicationController
  before_action :authenticate_user!, only: [:new, :create, :edit, :update, :destroy]

  def create
    @album = current_user.albums.build(album_params)
    **binding.pry**
    if @album.save
      redirect_to album_path(@album), notice: '保存できたよ'
    else
      flash.now[:error] = '保存に失敗しました'
      render :new
    end
  end

  private

  def album_params
    params.require(:album).permit(:title, pictures: [])
  end
end

• ターミナル

bundle exec rspec spec/requests/albums_spec.rb

[1] pry(#<AlbumsController>)> album_params

=> <ActionController::Parameters {"title"=>"r78fa69ajl", "pictures"=>["#Rack::Test::UploadedFile:0x00000001155e5748", "#Rack::Test::UploadedFile:0x00000001155e4488"]} permitted: true>

[1] pry(#<AlbumsController>)> @album.pictures

=> #<ActiveStorage::Attached::Many:0x000000011a706d20 @name="pictures", @record=#<Album:0x000000011c8bd810 id: nil, user_id: 17, title: "zd7kyby9bj", created_at: nil, updated_at: nil>>