mini_racer/test/mini_racer_test.rb

require 'test_helper'

class MiniRacerTest < Minitest::Test

  def test_that_it_has_a_version_number
    refute_nil ::MiniRacer::VERSION
  end

  def test_types
    context = MiniRacer::Context.new
    assert_equal 2, context.eval('2')
    assert_equal "two", context.eval('"two"')
    assert_equal 2.1, context.eval('2.1')
    assert_equal true, context.eval('true')
    assert_equal false, context.eval('false')
    assert_equal nil, context.eval('null')
    assert_equal nil, context.eval('undefined')
  end

  def test_array
    context = MiniRacer::Context.new
    assert_equal [1,"two"], context.eval('[1,"two"]')
  end

  def test_object
    context = MiniRacer::Context.new
    # remember JavaScript is quirky {"1" : 1} magically turns to {1: 1} cause magic
    assert_equal({1 => 2, "two" => "two"}, context.eval('a={"1" : 2, "two" : "two"}'))
  end

  def test_it_returns_runtime_error
    context = MiniRacer::Context.new
    exp = nil

    begin
      context.eval('var foo=function(){boom;}; foo()')
    rescue => e
      exp = e
    end

    assert_equal MiniRacer::RuntimeError, exp.class

    assert_match(/boom/, exp.message)
    assert_match(/foo/, exp.backtrace[0])
    assert_match(/mini_racer/, exp.backtrace[2])

    # context should not be dead
    assert_equal 2, context.eval('1+1')
  end

  def test_it_can_stop
    context = MiniRacer::Context.new
    exp = nil

    begin
      Thread.new do
        sleep 0.001
        context.stop
      end
      context.eval('while(true){}')
    rescue => e
      exp = e
    end

    assert_equal MiniRacer::ScriptTerminatedError, exp.class
    assert_match(/terminated/, exp.message)

  end

  def test_it_can_automatically_time_out_context
    # 2 millisecs is a very short timeout but we don't want test running forever
    context = MiniRacer::Context.new(timeout: 2)
    assert_raises do
      context.eval('while(true){}')
    end
  end

  def test_returns_javascript_function
    context = MiniRacer::Context.new
    assert_equal MiniRacer::JavaScriptFunction, context.eval("a = function(){}").class
  end

  def test_it_handles_malformed_js
    context = MiniRacer::Context.new
    assert_raises MiniRacer::ParseError do
      context.eval('I am not JavaScript {')
    end
  end

  def test_it_remembers_stuff_in_context
    context = MiniRacer::Context.new
    context.eval('var x = function(){return 22;}')
    assert_equal 22, context.eval('x()')
  end

  def test_can_attach_functions
    context = MiniRacer::Context.new
    context.attach("adder", proc{|a,b| a+b})
    assert_equal 3, context.eval('adder(1,2)')
  end

  def test_es6_arrow_functions
    context = MiniRacer::Context.new
    assert_equal 42, context.eval('adder=(x,y)=>x+y; adder(21,21);')
  end

  def test_concurrent_access
    context = MiniRacer::Context.new
    context.eval('counter=0; plus=()=>counter++;')

    (1..10).map do
      Thread.new {
        context.eval("plus()")
      }
    end.each(&:join)

    assert_equal 10, context.eval("counter")
  end

  class FooError < StandardError
    def initialize(message)
      super(message)
    end
  end

  def test_attached_exceptions
    context = MiniRacer::Context.new
    context.attach("adder", proc{ raise FooError, "I like foos" })
    assert_raises do
      begin
raise FooError, "I like foos"
        context.eval('adder()')
      rescue => e
        assert_equal FooError, e.class
        assert_match( /I like foos/, e.message)
        # TODO backtrace splicing so js frames are injected
        raise
      end
    end
  end

end