rails testを実行したらハマってしまった

Question

前提・実現したいこと

Rub on Railsのチュートリアルの4章をやっています
rails testを実行したい

rails testを実行しようとしたらエラーメッセージが表示された
googleで調べたけど何を直せばいいかわからない
herokuにアップしてからrails testができなくなった気がする

発生している問題・エラーメッセージ

rails testしようとしたらこう表示されました。

Running via Spring preloader in process 15611
/Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:32:in `require': cannot load such file -- minitest/reporters (LoadError)
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `block in require'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:249:in `load_dependency'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `require'
	from /Users/yuzi/rails/sample_app/test/test_helper.rb:4:in `<main>'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `block in require'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:249:in `load_dependency'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `require'
	from /Users/yuzi/rails/sample_app/test/controllers/static_pages_controller_test.rb:1:in `<main>'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `block in require'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:249:in `load_dependency'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `require'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.2.0/lib/rails/test_unit/runner.rb:50:in `block in load_tests'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.2.0/lib/rails/test_unit/runner.rb:50:in `each'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.2.0/lib/rails/test_unit/runner.rb:50:in `load_tests'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.2.0/lib/rails/test_unit/runner.rb:39:in `run'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.2.0/lib/rails/commands/test/test_command.rb:33:in `perform'
	from /Library/Ruby/Gems/2.3.0/gems/thor-0.20.0/lib/thor/command.rb:27:in `run'
	from /Library/Ruby/Gems/2.3.0/gems/thor-0.20.0/lib/thor/invocation.rb:126:in `invoke_command'
	from /Library/Ruby/Gems/2.3.0/gems/thor-0.20.0/lib/thor.rb:387:in `dispatch'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.2.0/lib/rails/command/base.rb:65:in `perform'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.2.0/lib/rails/command.rb:46:in `invoke'
	from /Library/Ruby/Gems/2.3.0/gems/railties-5.2.0/lib/rails/commands.rb:18:in `<main>'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `require'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:21:in `block in require_with_bootsnap_lfi'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/loaded_features_index.rb:65:in `register'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:20:in `require_with_bootsnap_lfi'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:29:in `require'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `block in require'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:249:in `load_dependency'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:283:in `require'
	from /Users/yuzi/rails/sample_app/bin/rails:9:in `<main>'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:50:in `load'
	from /Library/Ruby/Gems/2.3.0/gems/bootsnap-1.3.0/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:50:in `load'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:277:in `block in load'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:249:in `load_dependency'
	from /Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.0/lib/active_support/dependencies.rb:277:in `load'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from -e:1:in `<main>'

試したこと

rails db:migrate
最初にエラーメッセージがでたとき、

rails db:migration

をやれとターミナルに表示されて試してみたが、結局rails testはできず

Gemfileの内容をherokuにアップするために

group :production do
  gem 'pg'
end
group :development, :test do
  gem 'sqlite3'
end

と変更したせいだろうか

補足情報（FW/ツールのバージョンなど）

Ruby on Rails 5.2

Answer 1

エラーメッセージが cannot load such file -- minitest/reporters (LoadError) なので、Gemfileにライブラリ設定が無いことが原因の可能性が高いです。

Railsチュートリアルでminitestを検索してみたら「3.6.1 minitest reporters」があり、「リスト 3.2: サンプルアプリケーション用のGemfile」でminitest-reportersを追加しているとの説明がありました。

Gemfileの内容を、質問欄の最後に記入している内容だけに変更したらプログラムは動かないです。