The attached RSpec matcher allows for comfortably testing delegation.

Examples

describe Post do
  it { should delegate(:name).to(:author).with_prefix } # post.author_name
  it { should delegate(:month).to(:created_at) }
  it { should delegate(:year).to(:created_at) }
end

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Read more Show archive.org snapshot

Credits go to txus Show archive.org snapshot . See the attached link for an RSpec 2+ version.