Asserting true and false (ish) in rspec

gistfile1.rb

# If you want to check that something's true or false in the normal ruby sense
# (ie anything other than false or nil is true), you can use double negation
# to force it into an actual boolean (eg !!foo.should be_true). To keep this
# ugliness out of your tests, stick these matchers in your spec helper:

def be_truish
  return simple_matcher do |obj, matcher|
    matcher.description = 'be true(ish)'
    matcher.failure_message = "Expected #{obj.inspect} to be true(ish)"
    matcher.negative_failure_message = "Expected #{obj.inspect} not to be true(ish)"
    !!obj == true
  end
end

def be_falsish
  return simple_matcher do |obj, matcher|
    matcher.description = 'be false(ish)'
    matcher.failure_message = "Expected #{obj.inspect} to be false(ish)"
    matcher.negative_failure_message = "Expected #{obj.inspect} not to be false(ish)"
    !!obj == false
  end
end

# Test cases:

describe '-ish matchers' do
  it {1.should be_truish}
  it {'foo'.should be_truish}
  it {[].should be_truish}
  it {true.should be_truish}
  it {false.should_not be_truish}
  it {nil.should_not be_truish}

  it {false.should be_falsish}
  it {nil.should be_falsish}
  it {1.should_not be_falsish}
  it {'foo'.should_not be_falsish}
  it {[].should_not be_falsish}
  it {true.should_not be_falsish}
end