Flaky coverage, if use `load`

[Yegorov]

Hello!
I have such a problem:
If used load ... for load code, I only get coverage for the last test.

Example test case:

class TestApp < Minitest::Test
  def test_a_1
    assert_output('10') do
      $a = 1
      load(File.join(__dir__, "../app/main.rb"))
    end
  end

  def test_a_2
    assert_output('5') do
      $a = 2
      load(File.join(__dir__, "../app/main.rb"))
    end
  end

  def test_a_else
    assert_output('0') do
      $a = 3
      load(File.join(__dir__, "../app/main.rb"))
    end
  end
end

To make it clearer, I have sketched out a simple application: https://github.com/Yegorov/simplecov_flaky_coverage_if_use_load

Is it possible to somehow set it up so that the maximum coverage amount is used?