`rails new` runs `rails active_storage:install`

Omit `rails activestorage:install` for jdbcmysql, jdbc and shebang tests

AppGeneratorTest#test_config_jdbcmysql_database

  rails aborted!
  LoadError: Could not load 'active_record/connection_adapters/mysql_adapter'.
  Make sure that the adapter in config/database.yml is valid.
  If you use an adapter other than 'mysql2', 'postgresql' or 'sqlite3' add
  the necessary adapter gem to the Gemfile.
  (compressed)
  bin/rails:4:in `<main>'
  Tasks: TOP => activestorage:install => environment
  (See full trace by running task with --trace)

AppGeneratorTest#test_config_jdbc_database

  rails aborted!
  LoadError: Could not load 'active_record/connection_adapters/jdbc_adapter'.
  Make sure that the adapter in config/database.yml is valid.
  If you use an adapter other than 'mysql2', 'postgresql' or 'sqlite3' add
  the necessary adapter gem to the Gemfile.
  (compressed)
  bin/rails:4:in `<main>'
  Tasks: TOP => activestorage:install => environment
  (See full trace by running task with --trace)

AppGeneratorTest#test_shebang_is_added_to_rails_file

  /home/ubuntu/.rbenv/versions/2.4.1/bin/ruby: no Ruby script found in input (LoadError)

Prevent PendingMigrationError in tests

 * Run `bin/rails db:migrate RAILS_ENV=test` in test_cases before start tests to prevent PendingMigrationError
 * FileUtils.rm_r("db/migrate")
 * --skip-active-storage

Fix failed tests in `railties/test/railties/engine_test.rb`

Related to #30111

Imporve `SharedGeneratorTests#test_default_frameworks_are_required_when_others_are_removed`

 - Explicitly skip active_storage
 - Ensure that skipped frameworks are commented
 - Ensure that default frameworks are not commented

Fix error `Errno::ENOSPC: No space left on device - sendfile`

Since `rails new` runs `rails active_storage:install`
that boots an app.

Since adding Bootsnap 0312a5c67e35b960e33677b5358c539f1047e4e1
during booting an app, it creates the cache:

   264K    tmp/cache/bootsnap-load-path-cache
   27M     tmp/cache/bootsnap-compile-cache

* teardown_app must remove app

1 files changed, 27 insertions, 20 deletions

diff --git a/railties/test/railties/engine_test.rb b/railties/test/railties/engine_test.rb
index e6964b4b18..132b3b3a6e 100644
--- a/railties/test/railties/engine_test.rb
+++ b/railties/test/railties/engine_test.rb
@@ -32,6 +32,11 @@ module RailtiesTest
       require "#{app_path}/config/environment"
     end
 
+    def migrations
+      migration_root = File.expand_path(ActiveRecord::Migrator.migrations_paths.first, app_path)
+      ActiveRecord::Migrator.migrations(migration_root)
+    end
+
     test "serving sprocket's assets" do
       @plugin.write "app/assets/javascripts/engine.js.erb", "<%= :alert %>();"
       add_to_env_config "development", "config.assets.digest = false"
@@ -82,31 +87,30 @@ module RailtiesTest
         end
       RUBY
 
-      add_to_config "ActiveRecord::Base.timestamped_migrations = false"
-
       boot_rails
 
       Dir.chdir(app_path) do
         output = `bundle exec rake bukkits:install:migrations`
 
-        assert File.exist?("#{app_path}/db/migrate/2_create_users.bukkits.rb")
-        assert File.exist?("#{app_path}/db/migrate/3_add_last_name_to_users.bukkits.rb")
-        assert_match(/Copied migration 2_create_users\.bukkits\.rb from bukkits/, output)
-        assert_match(/Copied migration 3_add_last_name_to_users\.bukkits\.rb from bukkits/, output)
-        assert_match(/NOTE: Migration 3_create_sessions\.rb from bukkits has been skipped/, output)
-        assert_equal 3, Dir["#{app_path}/db/migrate/*.rb"].length
+        ["CreateUsers", "AddLastNameToUsers", "CreateSessions"].each do |migration_name|
+          assert migrations.detect { |migration| migration.name == migration_name }
+        end
+        assert_match(/Copied migration \d+_create_users\.bukkits\.rb from bukkits/, output)
+        assert_match(/Copied migration \d+_add_last_name_to_users\.bukkits\.rb from bukkits/, output)
+        assert_match(/NOTE: Migration \d+_create_sessions\.rb from bukkits has been skipped/, output)
 
-        output = `bundle exec rake railties:install:migrations`.split("\n")
+        migrations_count = Dir["#{app_path}/db/migrate/*.rb"].length
 
-        assert_no_match(/2_create_users/, output.join("\n"))
+        assert_equal migrations.length, migrations_count
 
-        bukkits_migration_order = output.index(output.detect { |o| /NOTE: Migration 3_create_sessions\.rb from bukkits has been skipped/ =~ o })
-        assert_not_nil bukkits_migration_order, "Expected migration to be skipped"
-
-        migrations_count = Dir["#{app_path}/db/migrate/*.rb"].length
-        `bundle exec rake railties:install:migrations`
+        output = `bundle exec rake railties:install:migrations`.split("\n")
 
         assert_equal migrations_count, Dir["#{app_path}/db/migrate/*.rb"].length
+
+        assert_no_match(/\d+_create_users/, output.join("\n"))
+
+        bukkits_migration_order = output.index(output.detect { |o| /NOTE: Migration \d+_create_sessions\.rb from bukkits has been skipped/ =~ o })
+        assert_not_nil bukkits_migration_order, "Expected migration to be skipped"
       end
     end
 
@@ -173,8 +177,8 @@ module RailtiesTest
       Dir.chdir(app_path) do
         output = `bundle exec rake railties:install:migrations`.split("\n")
 
-        assert_match(/Copied migration \d+_create_users\.core_engine\.rb from core_engine/, output.second)
-        assert_match(/Copied migration \d+_create_keys\.api_engine\.rb from api_engine/, output.last)
+        assert_match(/Copied migration \d+_create_users\.core_engine\.rb from core_engine/, output.first)
+        assert_match(/Copied migration \d+_create_keys\.api_engine\.rb from api_engine/, output.second)
       end
     end
 
@@ -203,9 +207,12 @@ module RailtiesTest
 
       Dir.chdir(@plugin.path) do
         output = `bundle exec rake app:bukkits:install:migrations`
-        assert File.exist?("#{app_path}/db/migrate/0_add_first_name_to_users.bukkits.rb")
-        assert_match(/Copied migration 0_add_first_name_to_users\.bukkits\.rb from bukkits/, output)
-        assert_equal 1, Dir["#{app_path}/db/migrate/*.rb"].length
+
+        migration_with_engine_path = migrations.detect { |migration| migration.name == "AddFirstNameToUsers" }
+        assert migration_with_engine_path
+        assert_match(/\/db\/migrate\/\d+_add_first_name_to_users\.bukkits\.rb/, migration_with_engine_path.filename)
+        assert_match(/Copied migration \d+_add_first_name_to_users\.bukkits\.rb from bukkits/, output)
+        assert_equal migrations.length, Dir["#{app_path}/db/migrate/*.rb"].length
       end
     end