Ruby on rails 为什么每次运行测试时都会创建数据库？

我是一个使用minitest进行测试的新手，在开始测试时遇到了困难。我想知道为什么每次运行测试时都会重新创建数据库。我看过的示例视频似乎不是这样（）。我的设置不正确吗？每次都应该这样吗

每次运行

rake minitest:models

时，我都会在运行测试之前看到下面的内容（缩短，因为它类似于500行）

测试助手.rb

ENV["RAILS_ENV"] = "test"
require File.expand_path("../../config/environment", __FILE__)
require "rails/test_help"
require 'minitest/rails'
require 'minitest/focus'

# To add Capybara feature tests add `gem "minitest-rails-capybara"`
# to the test group in the Gemfile and uncomment the following:
require "minitest/rails/capybara"

# Uncomment for awesome colorful output
require "minitest/pride"

class ActiveSupport::TestCase
  # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
  fixtures :all

  # Add more helper methods to be used by all tests here...
  def self.prepare
    # Add code that needs to be executed before test suite start
  end
  prepare

  def setup
    # Add code that need to be executed before each test
  end

  def teardown
    # Add code that need to be executed after each test
  end
end

require File.expand_path('../boot', __FILE__)

require "active_record/railtie"
require "action_controller/railtie"
require 'rake/testtask'
require "action_mailer/railtie"
require "active_resource/railtie"
require "sprockets/railtie"
require "minitest/rails/railtie"

if defined?(Bundler)
  Bundler.require(*Rails.groups(:assets => %w(development test)))
end

module Martinfurniture
  class Application < Rails::Application
    # Configure the default encoding used in templates for Ruby 1.9.
    config.encoding = "utf-8"

    # Configure sensitive parameters which will be filtered from the log file.
    config.filter_parameters += [:password]

    # Enable escaping HTML in JSON.
    config.active_support.escape_html_entities_in_json = true

    # Allows for sub-directories in Models
    config.autoload_paths += Dir[Rails.root.join('app', 'models', '{**}')]

    config.active_record.whitelist_attributes = true

    config.autoload_paths += %W(#{config.root}/app/models/ckeditor)

    config.sass.debug_info = true

    config.exceptions_app = self.routes

    # Enable the asset pipeline
    config.assets.enabled = true

    # Version of your assets, change this if you want to expire all your assets
    config.assets.version = '1.0'

    # Devise
    config.assets.initialize_on_precompile = false

    # Testing
    config.generators do |g|
      g.test_framework :mini_test
      g.helper false
      g.assets false
      g.view_specs false
    end
  end
end

应用程序.rb

ENV["RAILS_ENV"] = "test"
require File.expand_path("../../config/environment", __FILE__)
require "rails/test_help"
require 'minitest/rails'
require 'minitest/focus'

# To add Capybara feature tests add `gem "minitest-rails-capybara"`
# to the test group in the Gemfile and uncomment the following:
require "minitest/rails/capybara"

# Uncomment for awesome colorful output
require "minitest/pride"

class ActiveSupport::TestCase
  # Setup all fixtures in test/fixtures/*.(yml|csv) for all tests in alphabetical order.
  fixtures :all

  # Add more helper methods to be used by all tests here...
  def self.prepare
    # Add code that needs to be executed before test suite start
  end
  prepare

  def setup
    # Add code that need to be executed before each test
  end

  def teardown
    # Add code that need to be executed after each test
  end
end

require File.expand_path('../boot', __FILE__)

require "active_record/railtie"
require "action_controller/railtie"
require 'rake/testtask'
require "action_mailer/railtie"
require "active_resource/railtie"
require "sprockets/railtie"
require "minitest/rails/railtie"

if defined?(Bundler)
  Bundler.require(*Rails.groups(:assets => %w(development test)))
end

module Martinfurniture
  class Application < Rails::Application
    # Configure the default encoding used in templates for Ruby 1.9.
    config.encoding = "utf-8"

    # Configure sensitive parameters which will be filtered from the log file.
    config.filter_parameters += [:password]

    # Enable escaping HTML in JSON.
    config.active_support.escape_html_entities_in_json = true

    # Allows for sub-directories in Models
    config.autoload_paths += Dir[Rails.root.join('app', 'models', '{**}')]

    config.active_record.whitelist_attributes = true

    config.autoload_paths += %W(#{config.root}/app/models/ckeditor)

    config.sass.debug_info = true

    config.exceptions_app = self.routes

    # Enable the asset pipeline
    config.assets.enabled = true

    # Version of your assets, change this if you want to expire all your assets
    config.assets.version = '1.0'

    # Devise
    config.assets.initialize_on_precompile = false

    # Testing
    config.generators do |g|
      g.test_framework :mini_test
      g.helper false
      g.assets false
      g.view_specs false
    end
  end
end

需要文件。展开路径（'../boot'，文件）
需要“活动记录/轨道连接”
需要“控制器/轨道连接的操作”
需要“rake/testtask”
要求采取“行动”\u邮递员/railtie
需要“活动资源/railtie”
需要“链轮/系杆”
需要“微型测试/轨道/枕木”
如果定义？（捆绑机）
Bundler.require（*Rails.groups（：资产=>%w（开发测试）））
终止
家具模块
类应用程序

您可以关闭所有sql查询的打印，使用

ActiveRecord:：Base.logger=nil

根据TDD原则，每次运行测试时都应清除可重复的

测试数据库。因此，数据库删除似乎是预期的行为。谢谢，有没有办法让它不打印数据库创建（它创建了大量的视觉混乱）？oops，这应该是为了响应：>谢谢，有没有办法让它不打印数据库创建（它创建了大量的视觉混乱）？——6小时前的贪婪