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require 'test/unit'
require 'ffaker'
# Helpers for checking if a method is deterministic -- e.g., that the Random
# results are repeatable given the same random seed.
module DeterministicHelper
def self.included(base)
base.extend ClassMethods
end
# Accepts a block. Executes the block multiple times after resetting
# the internal Random Number Generator state and compared the results of
# each execution to make sure they are the same.
def assert_deterministic(options = {})
raise ArgumentError, 'Must pass a block' unless block_given?
options = { message: 'Results are not repeatable' }.merge(options)
returns = Array.new(2) do
FFaker::Random.reset!
Array.new(5) do
yield
end
end
assert(returns.uniq.length == 1, options[:message])
end
# Methods to be called outside of individual examples.
module ClassMethods
# Shorthand method to quickly test the determinability of multiple methods.
#
# assert_methods_are_deterministic(
# <faker module under test>,
# <method names to test, as array of symbols>
# )
#
# assert_methods_are_deterministic(
# FFaker::SomeModule,
# :some_method, :some_other_method
# }
def assert_methods_are_deterministic(klass, *methods)
Array(methods).each do |meth|
define_method "test_#{meth}_is_deterministic" do
assert_deterministic(message: "Results from `#{klass}.#{meth}` are not repeatable") do
klass.send(meth)
end
end
end
end
end
end
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10 entries across 10 versions & 1 rubygems