Ruby on Rails Tutorial 3章

3.29でエラー

```

ec2-user:~/environment/sample_app (static-pages) $ rails test
Running via Spring preloader in process 5513
/home/ec2-user/environment/sample_app/db/schema.rb doesn't exist yet. Run `rails db:migrate` to create it, then try again. If you do not intend to use a database, you should instead alter /home/ec2-user/environment/sample_app/config/application.rb to limit the frameworks that will be loaded.
Run options: --seed 14533

# Running:

...

Finished in 0.182232s, 16.4625 runs/s, 32.9251 assertions/s.

3 runs, 6 assertions, 0 failures, 0 errors, 0 skips
Traceback (most recent call last):
        33: from -e:1:in `<main>'
        32: from /home/ec2-user/.rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        31: from /home/ec2-user/.rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        30: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application/boot.rb:19:in `<top (required)>'
        29: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `run'
        28: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `loop'
        27: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:141:in `block in run'
        26: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:171:in `serve'
        25: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:171:in `fork'
        24: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/minitest-5.10.3/lib/minitest.rb:63:in `block in autorun'
        23: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/minitest-5.10.3/lib/minitest.rb:141:in `run'
        22: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/minitest-5.10.3/lib/minitest.rb:687:in `report'
        21: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/minitest-5.10.3/lib/minitest.rb:687:in `each'
        20: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-minitest-2.4.4/lib/guard/minitest/reporter.rb:10:in `report'
        19: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-minitest-2.4.4/lib/guard/minitest/notifier.rb:31:in `notify'
        18: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-compat-1.2.1/lib/guard/compat/plugin.rb:113:in `notify'
        17: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-2.13.0/lib/guard/notifier.rb:31:in `notify'
        16: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-2.13.0/lib/guard/notifier.rb:11:in `connect'
        15: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:42:in `connect'
        14: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:42:in `new'
        13: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:87:in `initialize'
        12: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:198:in `_activate'
        11: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:180:in `_detect_or_add_notifiers'
        10: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:59:in `detect'
         9: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:59:in `each'
         8: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:60:in `block in detect'
         7: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:60:in `detect'
         6: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:60:in `each'
         5: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:62:in `block (2 levels) in detect'
         4: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:100:in `_add'
         3: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:100:in `new'
         2: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/base.rb:59:in `initialize'
         1: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/tmux.rb:69:in `_check_available'
/home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/tmux/client.rb:12:in `version': undefined method `[]' for nil:NilClass (NoMethodError)
ec2-user:~/en

```


/home/ec2-user/environment/sample_app/db/schema.rb doesn't exist yet. Run `rails db:migrate` to create it, then try again. If you do not intend to use a database, you should instead alter /home/ec2-user/environment/sample_app/config/application.rb to limit the frameworks that will be loaded.
つまりスキーマがないて言われているが



```
ec2-user:~/environment/sample_app (static-pages) $ rails db:migrate
ec2-user:~/environment/sample_app (static-pages) $ rails test
Running via Spring preloader in process 5592
Run options: --seed 64012

# Running:

...

Finished in 0.184495s, 16.2606 runs/s, 32.5211 assertions/s.

3 runs, 6 assertions, 0 failures, 0 errors, 0 skips
Traceback (most recent call last):
        33: from -e:1:in `<main>'
        32: from /home/ec2-user/.rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        31: from /home/ec2-user/.rvm/rubies/ruby-2.6.0/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        30: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application/boot.rb:19:in `<top (required)>'
        29: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `run'
        28: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `loop'
        27: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:141:in `block in run'
        26: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:171:in `serve'
        25: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/spring-2.0.2/lib/spring/application.rb:171:in `fork'
        24: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/minitest-5.10.3/lib/minitest.rb:63:in `block in autorun'
        23: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/minitest-5.10.3/lib/minitest.rb:141:in `run'
        22: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/minitest-5.10.3/lib/minitest.rb:687:in `report'
        21: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/minitest-5.10.3/lib/minitest.rb:687:in `each'
        20: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-minitest-2.4.4/lib/guard/minitest/reporter.rb:10:in `report'
        19: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-minitest-2.4.4/lib/guard/minitest/notifier.rb:31:in `notify'
        18: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-compat-1.2.1/lib/guard/compat/plugin.rb:113:in `notify'
        17: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-2.13.0/lib/guard/notifier.rb:31:in `notify'
        16: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/guard-2.13.0/lib/guard/notifier.rb:11:in `connect'
        15: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:42:in `connect'
        14: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:42:in `new'
        13: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:87:in `initialize'
        12: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:198:in `_activate'
        11: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier.rb:180:in `_detect_or_add_notifiers'
        10: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:59:in `detect'
         9: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:59:in `each'
         8: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:60:in `block in detect'
         7: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:60:in `detect'
         6: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:60:in `each'
         5: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:62:in `block (2 levels) in detect'
         4: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:100:in `_add'
         3: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/detected.rb:100:in `new'
         2: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/base.rb:59:in `initialize'
         1: from /home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/tmux.rb:69:in `_check_available'
/home/ec2-user/.rvm/gems/ruby-2.6.0/gems/notiffany-0.1.1/lib/notiffany/notifier/tmux/client.rb:12:in `version': undefined method `[]' for nil:NilClass (NoMethodError)
ec2-user:~/environment/sample_app (static-pages) $ 

```

GREENだがエラーがぞろぞろ出ていて気になる
minitestが海外版チュートリアルに合わせる必要があったのか思いだせない
エラーでググったら最近できていた
[Railsチュートリアル三章あたりから、テストの際にエラーが出る方々へ...](https://qiita.com/uranosatoshi/items/db46aef8c7d8a09489c4)



Tmux
一週目でやったような
ノート3章で出るエラーで取り上げた
[原因と解決法](
https://ty-engineer.com/ruby-on-rails/rails-tutorial-3-error-tmux/)


sudo yum install -y tmux

```

ec2-user:~/environment/sample_app (static-pages) $ sudo yum install -y tmux
Loaded plugins: priorities, update-motd, upgrade-helper
amzn-main                                              | 2.1 kB     00:00     
amzn-updates                                           | 2.5 kB     00:00     
1060 packages excluded due to repository priority protections
Resolving Dependencies
--> Running transaction check
---> Package tmux.x86_64 0:1.8-4.12.amzn1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==============================================================================
 Package      Arch           Version                  Repository         Size
==============================================================================
Installing:
 tmux         x86_64         1.8-4.12.amzn1           amzn-main         254 k

Transaction Summary
==============================================================================
Install  1 Package

Total download size: 254 k
Installed size: 543 k
Downloading packages:
tmux-1.8-4.12.amzn1.x86_64.rpm                           | 254 kB   00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : tmux-1.8-4.12.amzn1.x86_64                                 1/1 
  Verifying  : tmux-1.8-4.12.amzn1.x86_64                                 1/1 

Installed:
  tmux.x86_64 0:1.8-4.12.amzn1                                                

Complete!
ec2-user:~/environment/sample_app (static-pages) $ 

```


Dependencies Resolvedとあるし解決された模様？

```

ec2-user:~/environment/sample_app (static-pages) $ rails test
Running via Spring preloader in process 5793
Run options: --seed 38797

# Running:

...

Finished in 0.141402s, 21.2161 runs/s, 42.4322 assertions/s.

3 runs, 6 assertions, 0 failures, 0 errors, 0 skips

ec2-user:~/environment/sample_app (static-pages) $ 

OK！
```