a_nested_matcher.rb

# this is just a rough example, the actual nested matcher is irrelevant


Spec::Matchers.define :string_containing do |substring|
  match do |actual|
    actual.include?(substring)
  end
end

results = some_array
results.should include(string_containing("foo"))

matcher_alias.rb

# while I'm on the subject, it would be able to reuse the above string_containing matcher for a string directly, but it would need to be named differently to read correctly, i.e.:

"foobar".should contain_string("foo")

# so it would be nice to do:

Spec::Matchers.define :string_containing, :aliases => [:contain_string] do |substring|
  match do |actual|
    actual.include?(substring)
  end
end