gistfile1.rb

# Minitest examples

# wishful
describe Person do
  describe 'indirect' do
    subject { Person.new({pet: true}) }

    it { must_be :pet? }
  end
end

# current
# Example 1: using valid_attributes [3]

describe Person do
  context 'should have validations' do
    subject { Person.new }

    it { must have_valid(:name).when(sentence) }
    it { wont have_valid(:name).when(nil, '') }
  end
end

# Example 2
describe Person do
  let(:person) { Person.new({pet: true}) }

  it 'has a pet' do
    assert person.pet?
  end
end

# Example 3
describe Person do
  subject { Person.new("Yukihiro", "Matsumoto") }

  it "has a full name" do
    subject.full_name.must_equal "Yukihiro Matsumoto"
  end
end
And

# Example 4
describe Person do
  subject { Person.new }

  specify { subject.posts.must_be_empty }
end

Links:
[1] http://blog.arvidandersson.se/2012/03/28/minimalicous-testing-in-ruby-1-9
[2] https://github.com/zenspider/minitest-matchers
[3] https://github.com/wojtekmach/valid_attribute