Make sure this test check the issue solved in rails#31135

Before this change this test was passing even if we revert rails#31135. The
reason for that is that `app 'development'` will load the environment in
the test process and it is happening before db_create_and_drop is
called.

This was not asserting that the environment was loaded in the db:create
task itself.

To test it we enhance the db:create task with a block that writes to a
tmp file the value of the config. If the environment is loaded before
that task enhancement runs the content of the file will have "true"
insteand of "false".

Author: rafaelfranca

railties/test/application/rake/dbs_test.rb

@@ -26,12 +26,13 @@ def set_database_url
         FileUtils.rm_rf("#{app_path}/config/database.yml")
       end
 
-      def db_create_and_drop(expected_database)
+      def db_create_and_drop(expected_database, environment_loaded: true)
         Dir.chdir(app_path) do
           output = rails("db:create")
           assert_match(/Created database/, output)
           assert File.exist?(expected_database)
-          assert_equal expected_database, ActiveRecord::Base.connection_config[:database]
+          yield if block_given?
+          assert_equal expected_database, ActiveRecord::Base.connection_config[:database] if environment_loaded
           output = rails("db:drop")
           assert_match(/Dropped database/, output)
           assert_not File.exist?(expected_database)
@@ -62,11 +63,16 @@ def db_create_and_drop(expected_database)
           end
         RUBY
 
-        app "development"
-
-        assert_equal true, Rails.application.config.read_encrypted_secrets
+        app_file "lib/tasks/check_env.rake", <<-RUBY
+          Rake::Task["db:create"].enhance do
+            File.write("tmp/config_value", Rails.application.config.read_encrypted_secrets)
+          end
+        RUBY
 
-        db_create_and_drop "db/development.sqlite3"
+        db_create_and_drop("db/development.sqlite3", environment_loaded: false) do
+          assert File.exist?("tmp/config_value")
+          assert_equal "true", File.read("tmp/config_value")
+        end
       end
 
       def with_database_existing