回答編集履歴
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Fix answer
test
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## 追記
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たとえば、`web` から `ping` を実行してみるとどうでしょうか？
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```console
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root@3ac5aad020bf:/workdir# ping db-test
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PING db-test (172.31.0.2) 56(84) bytes of data.
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64 bytes from test-docker-286284_db-test_1.test-docker-286284_default (172.31.0.2): icmp_seq=1 ttl=64 time=0.116 ms
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64 bytes from test-docker-286284_db-test_1.test-docker-286284_default (172.31.0.2): icmp_seq=2 ttl=64 time=0.067 ms
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64 bytes from test-docker-286284_db-test_1.test-docker-286284_default (172.31.0.2): icmp_seq=3 ttl=64 time=0.082 ms
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64 bytes from test-docker-286284_db-test_1.test-docker-286284_default (172.31.0.2): icmp_seq=4 ttl=64 time=0.070 ms
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```
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こちらで質問欄のコードをすべて使い動作確認を行ったところ、
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rspec は実行できました:
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```console
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root@385d4f318198:/workdir# bundle exec rspec
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2020-08-21 06:36:20 WARN Selenium [DEPRECATION] Selenium::WebDriver::Chrome#driver_path= is deprecated. Use Selenium::WebDriver::Chrome::Service#driver_path= instead.
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Finished in 0.07961 seconds (files took 1.63 seconds to load)
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1 example, 0 failures
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```
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database.yml を次のように書き換えると:
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```diff
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- host: db-test
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+ host: db-not-exist
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```
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```console
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root@385d4f318198:/workdir# bundle exec rspec
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2020-08-21 06:36:52 WARN Selenium [DEPRECATION] Selenium::WebDriver::Chrome#driver_path= is deprecated. Use Selenium::WebDriver::Chrome::Service#driver_path= instead.
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An error occurred while loading ./spec/models/test_spec.rb.
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Failure/Error: ActiveRecord::Migration.maintain_test_schema!
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Mysql2::Error::ConnectionError:
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Unknown MySQL server host 'db-not-exist' (-2)
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# /usr/local/bundle/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `connect'
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# /usr/local/bundle/gems/mysql2-0.5.3/lib/mysql2/client.rb:90:in `initialize'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `new'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_adapters/mysql2_adapter.rb:22:in `mysql2_connection'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:830:in `new_connection'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:874:in `checkout_new_connection'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:853:in `try_to_checkout_new_connection'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:814:in `acquire_connection'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:538:in `checkout'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:382:in `connection'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:1033:in `retrieve_connection'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_handling.rb:118:in `retrieve_connection'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/connection_handling.rb:90:in `connection'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/migration.rb:583:in `load_schema_if_pending!'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/migration.rb:599:in `block in maintain_test_schema!'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/migration.rb:848:in `suppress_messages'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/migration.rb:604:in `method_missing'
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# /usr/local/bundle/gems/activerecord-5.2.4.3/lib/active_record/migration.rb:599:in `maintain_test_schema!'
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# ./spec/rails_helper.rb:93:in `<top (required)>'
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# ./spec/models/test_spec.rb:1:in `require'
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# ./spec/models/test_spec.rb:1:in `<top (required)>'
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No examples found.
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Finished in 0.00005 seconds (files took 2.5 seconds to load)
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0 examples, 0 failures, 1 error occurred outside of examples
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```
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そのため、質問欄に提示されているコード自体は誤っていなさそうです
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## 元の回答
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おそらく、次のようにすると実行できます:
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