Array.clear empties the have_received expectation

[hypernova2002]

I have a method which receives a non-empty array. I call array.clear after the method is called, but the expectation seems to believe the method was called with an empty array.

class TestClass
  def test_method_1(string)
    array = []
    array << string

    test_method_2(array)

    array.clear
  end

  def test_method_2(array); end
end

RSpec.describe TestClass do
  let(:test_class) { TestClass.new }
  let(:test_string) { 'some string' }

  it "method 1 calls method 2 with array" do
    allow(test_class).to receive(:test_method_2).with([test_string])

    test_class.test_method_1(test_string)

    expect(test_class).to have_received(:test_method_2).with([test_string])
  end
end

[JonRowe]

Congratulations, you found a bug! This is happening because the array is being mutated and we're not preventing that. See rspec/rspec-mocks#1183, closing as this is an rspec-mocks issue.