Module: Properb

Defined in:
lib/properb.rb,
lib/properb/generator.rb,
lib/properb/generators.rb,
lib/properb/shrink_tree.rb,
lib/properb/rspec/example_methods.rb,
lib/properb/generators/array_generator.rb,
lib/properb/generators/sized_generator.rb,
lib/properb/generators/tuple_generator.rb,
lib/properb/generators/choice_generator.rb,
lib/properb/generators/mapped_generator.rb,
lib/properb/rspec/example_group_methods.rb,
lib/properb/generators/integer_generator.rb,
lib/properb/generators/constant_generator.rb,
lib/properb/generators/deferred_generator.rb,
lib/properb/generators/selected_generator.rb,
lib/properb/generators/recursive_generator.rb,
lib/properb/generators/frequencies_generator.rb

Defined Under Namespace

Modules: AllExceptionsExceptOnesWeMustNotRescue, Generators, RSpec Classes: Generator, ShrinkTree, TestRunner

Class Method Summary collapse

Class Method Details

.for_all(generators, size: 0..10, num_tests: 100, assumption_limit: 10, &block) ⇒ Object 



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# File 'lib/properb.rb', line 51

def self.for_all(generators, size: 0..10, num_tests: 100, assumption_limit: 10, &block)
  test_runner = TestRunner.new(block)

  random = Random.new
  generated = nil
  passed = Set.new
  generator = Generators.hashmap(generators)
  current_size = if size.is_a?(Range)
                   size.min
                 else
                   size
                 end
  num_tests.times do
    result = false
    attempt_number = 0
    until result
      if attempt_number >= assumption_limit
        raise StandardError,
              "Could not satisfy assumptions after #{assumption_limit} attempts"
      end

      current_size += 1 if size.is_a?(Range) && size.include?(current_size + 1)
      generated = generator.generate_value(random, current_size)
      result = test_runner.run(generated.value)
      attempt_number += 1
    end
    passed << generated.value
  end
rescue AllExceptionsExceptOnesWeMustNotRescue => e
  exception, = shrink(generated, e, passed, test_runner)
  raise exception
end

.rspec_install(config) ⇒ Object 



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# File 'lib/properb.rb', line 22

def self.rspec_install(config)
  config.extend Properb::RSpec::ExampleGroupMethods
  config.include Properb::RSpec::ExampleMethods
  config.extend Properb::Generators
end

.shrink(generated, exception, passed, test_runner) ⇒ Object 



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# File 'lib/properb.rb', line 84

def self.shrink(generated, exception, passed, test_runner)
  smallest = generated
  while smallest
    begin
      current = nil
      smallest.children.each do |child|
        current = child
        next if passed.include?(current.value)

        if test_runner.run(current.value)
          passed << current.value
        else
          # If the assumptions have failed then we don't learn anything
          # useful. We process this node's children before continuing,
          # in the hopes that we get some information from them instead.
          e, current = shrink(current, exception, passed, test_runner)
          raise e unless e == exception
        end
      end
      break
    rescue AllExceptionsExceptOnesWeMustNotRescue => e
      smallest = current
      exception = e
    end
  end
  [exception, smallest]
end