Test Mocha deprecation warning

Gemfile

source :rubygems

gem "mocha", require: false

my_test.rb

require "bundler/setup"

require "test/unit"
require "mocha/setup"

class MyTest < Test::Unit::TestCase
  def test_me
    assert true
  end
end

my_test.txt

$ ruby my_test.rb
Run options: 

# Running tests:

.

Finished tests in 0.000551s, 1814.8820 tests/s, 1814.8820 assertions/s.

1 tests, 1 assertions, 0 failures, 0 errors, 0 skips