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# frozen_string_literal: true

RSpec.shared_examples 'Gitlab-style deprecations' do
  describe 'validations' do
    it 'raises an informative error if `deprecation_reason` is used' do
      expect { subject(deprecation_reason: 'foo') }.to raise_error(
        ArgumentError,
        'Use `deprecated` property instead of `deprecation_reason`. ' \
        'See https://docs.gitlab.com/ee/development/api_graphql_styleguide.html#deprecating-fields-arguments-and-enum-values'
      )
    end

    it 'raises an error if a required property is missing', :aggregate_failures do
      expect { subject(deprecated: { milestone: '1.10' }) }.to raise_error(
        ArgumentError,
        'Please provide a `reason` within `deprecated`'
      )
      expect { subject(deprecated: { reason: 'Deprecation reason' }) }.to raise_error(
        ArgumentError,
        'Please provide a `milestone` within `deprecated`'
      )
    end

    it 'raises an error if milestone is not a String', :aggregate_failures do
      expect { subject(deprecated: { milestone: 1.10, reason: 'Deprecation reason' }) }.to raise_error(
        ArgumentError,
        '`milestone` must be a `String`'
      )
    end
  end

  it 'adds a formatted `deprecated_reason` to the subject' do
    deprecable = subject(deprecated: { milestone: '1.10', reason: 'Deprecation reason' })

    expect(deprecable.deprecation_reason).to eq('Deprecation reason. Deprecated in 1.10.')
  end

  it 'appends to the description if given' do
    deprecable = subject(
      deprecated: { milestone: '1.10', reason: 'Deprecation reason' },
      description: 'Deprecable description.'
    )

    expect(deprecable.description).to eq('Deprecable description. Deprecated in 1.10: Deprecation reason.')
  end

  it 'does not append to the description if it is absent' do
    deprecable = subject(deprecated: { milestone: '1.10', reason: 'Deprecation reason' })

    expect(deprecable.description).to be_nil
  end
end