Rails core - Oct 2014 - [Feature request] assert_valid / refute_valid ActiveModel test helpers

This was proposed as an idea 4 years ago in 
https://github.com/rails/rails/pull/95. It was closed at that time, but I'd 
like to propose a refreshed version targeted towards ActiveModel and 
Minitest. The gem is at https://github.com/jch/minitest-model.

This feature is more useful today than when it was originally proposed 
because any ActiveModel::Validations standardized the interface used by 
ORMs and general ruby objects. Here is a sample of what it looks like:

class MyTest < ActiveSupport::TestCase
  include Minitest::Model


  test "model requires email" do
    m = Model.new
    refute_valid m, :email


    m.email = "foo@bar.com"
    assert_valid m, :email
  end
end


Failed assertions print a descriptive message of why it failed rather than 
a generic "Expected true" if asserting on just `valid?`.

Thanks!
-Jerry

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