How can the presence of translation be validated using the mobility gem in Minitest?

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To validate the presence of translation using the mobility gem in Minitest, you can define a test case that checks if the translated value is present in the database. Here's an example:

require 'test_helper'

class MyModelTest < ActiveSupport::TestCase
  test "should save translated value" do
    object = MyModel.create(title: "Hello", title_fr: "Bonjour")
    assert_equal "Hello", object.title
    assert_equal "Bonjour", object.title_fr
  end
end

In this example, we create an instance of MyModel with the title attribute set to "Hello" and the title_fr attribute set to "Bonjour". We then use assert_equal to validate that the correct values are saved in the database.

If the translated value is not present, the test will fail and you'll need to investigate the cause of the error.