how to test ruby inheritance with rspec

For something like this

class Child < Parent; end

I usually do:

it 'should inherit behavior from Parent' do
  expect(Child.superclass).to eq(Parent)
end

Here's an easy way to test for class inheritance with RSpec:

Given

class A < B; end

a much simpler way to test inheritance with RSpec would be:

describe A do
  it { expect(described_class).to be < B }
end

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