用Minitest测试助手方法

问题描述：

我想使用 Minitest 测试一个帮助方法（ minitest-rails ） - 但辅助方法取决于 current_user ，可用于控制器和视图的Devise助手方法。

I would like to test a helper method using Minitest (minitest-rails) - but the helper method depends on current_user, a Devise helper method available to controllers and view.

app / helpers / application_helper.rb

def user_is_admin?                           # want to test
    current_user && current_user.admin?
end

test / helpers / application_helper_test.rb p>

test/helpers/application_helper_test.rb

require 'test_helper'

class ApplicationHelperTest < ActionView::TestCase
    test 'user is admin method' do
        assert user_is_admin?                # but current_user is undefined
    end
end

请注意，我能够测试不依赖 current_user 的其他帮助方法。

Note that I am able to test other helper methods that do not rely on current_user.

答

你在Rails中测试一个助手，帮助器被包含在测试对象中。（测试对象是ActionView :: TestCase的一个实例）您的帮助者的 user_is_admin？方法期待一个名为 current_user 也存在。在控制器和view_context对象上，此方法由Devise提供，但它不在您的测试对象上。我们来补充一下：

When you test a helper in Rails, the helper is included in the test object. (The test object is an instance of ActionView::TestCase.) Your helper's user_is_admin? method is expecting a method named current_user to also exist. On the controller and view_context objects this method is provided by Devise, but it is not on your test object, yet. Let's add it:

require 'test_helper'

class ApplicationHelperTest < ActionView::TestCase
    def current_user
        users :default
    end
    test 'user is admin method' do
        assert user_is_admin?
    end
end

current_user返回的对象取决于您。在这里我们返回了一个数据夹具。您可以在这里返回任何在您测试的上下文中有意义的对象。

The object returned by current_user is up to you. Here we've returned a data fixture. You could return any object here that would make sense in the context of your test.

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