advanced_const_mocking

🛠 Mock and Stub Private Constants with stub_const

When you need to override deeply nested or private constants (e.g., feature flags or third‑party clients), stub_const ensures isolation without altering production code.

module Feature
  PRIVATE_API_URL = 'https://api.example.com'.freeze
end

RSpec.describe MyService do
  before do
    stub_const('Feature::PRIVATE_API_URL', 'https://staging.example.com')
  end

  it 'uses the stubbed URL during request' do
    expect(MyService.call).to include('staging.example.com')
  end
end