Class: Rantly::Property

Inherits:
Object
  • Object
show all
Defined in:
lib/rantly/property.rb

Constant Summary collapse

VERBOSITY = 
ENV.fetch('RANTLY_VERBOSE') { 1 }.to_i
RANTLY_COUNT = 
ENV.fetch('RANTLY_COUNT') { 100 }.to_i

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(property) ⇒ Property

Returns a new instance of Property.



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# File 'lib/rantly/property.rb', line 23

def initialize(property)
  @property = property
end

Instance Attribute Details

#failed_data ⇒ Object (readonly)

Returns the value of attribute failed_data.



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# File 'lib/rantly/property.rb', line 6

def failed_data
  @failed_data
end

#shrunk_failed_data ⇒ Object (readonly)

Returns the value of attribute shrunk_failed_data.



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# File 'lib/rantly/property.rb', line 6

def shrunk_failed_data
  @shrunk_failed_data
end

Instance Method Details

#check(n = RANTLY_COUNT, limit = 10, &assertion) ⇒ Object 



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# File 'lib/rantly/property.rb', line 27

def check(n = RANTLY_COUNT, limit = 10, &assertion)
  i = 0
  test_data = nil
  begin
    Rantly.singleton.generate(n, limit, @property) do |val|
      test_data = val
      yield(val) if assertion
      io.puts '' if (i % 100).zero?
      io.print '.' if (i % 10).zero?
      i += 1
    end
    io.puts
    io.puts "SUCCESS - #{i} successful tests"
  rescue Rantly::TooManyTries => e
    io.puts
    io.puts "FAILURE - #{i} successful tests, too many tries: #{e.tries}"
    raise e.exception("#{i} successful tests, too many tries: #{e.tries} (limit: #{e.limit})")
  rescue Exception => boom
    io.puts
    io.puts "FAILURE - #{i} successful tests, failed on:"
    pretty_print test_data
    @failed_data = test_data
    if @failed_data.respond_to?(:shrink)
      @shrunk_failed_data, @depth = shrinkify(assertion, @failed_data)
      io.puts "Minimal failed data (depth #{@depth}) is:"
      pretty_print @shrunk_failed_data
    end
    raise boom.exception("#{i} successful tests, failed on:\n#{test_data}\n\n#{boom}\n")
  end
end

#io ⇒ Object 



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# File 'lib/rantly/property.rb', line 11

def io
  @io ||= if VERBOSITY >= 1
            STDOUT
          else
            StringIO.new
          end
end

#pretty_print(object) ⇒ Object 



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# File 'lib/rantly/property.rb', line 19

def pretty_print(object)
  PP.pp(object, io)
end

#shrinkify(assertion, data, depth = 0, iteration = 0) ⇒ Object

Explore the failures tree



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# File 'lib/rantly/property.rb', line 59

def shrinkify(assertion, data, depth = 0, iteration = 0)
  min_data = data
  max_depth = depth
  if data.shrinkable?
    while iteration < 1024
      # We assume that data.shrink is non-destructive
      shrunk_data = data.shrink
      begin
        assertion.call(shrunk_data)
      rescue Exception
        # If the assertion was verified, recursively shrink failure case
        branch_data, branch_depth, iteration = shrinkify(assertion, shrunk_data, depth + 1, iteration + 1)
        if branch_depth > max_depth
          min_data = branch_data
          max_depth = branch_depth
        end
      end
      break unless data.retry?
    end
  end
  [min_data, max_depth, iteration]
end