mrubyedge 2.1.2

mruby/edge is yet another mruby that is specialized for running on WASM
Documentation 
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##
# NilClass ISO Test

assert('NilClass', '15.2.4') do
  assert_equal Class, NilClass.class
end

assert('NilClass', '15.2.4.1') do
  assert_equal NilClass, nil.class
  assert_false NilClass.method_defined? :new
end

assert('NilClass#&', '15.2.4.3.1') do
  assert_false nil.&(true)
  assert_false nil.&(nil)
end

assert('NilClass#^', '15.2.4.3.2') do
  assert_true nil.^(true)
  assert_false nil.^(false)
end

assert('NilClass#|', '15.2.4.3.3') do
  assert_true nil.|(true)
  assert_false nil.|(false)
end

assert('NilClass#nil?', '15.2.4.3.4') do
  assert_true nil.nil?
end

assert('NilClass#to_s', '15.2.4.3.5') do
  assert_equal '', nil.to_s
end

assert('NilClass#=~') do
  assert_nil nil =~ "a"
  assert_nil nil =~ nil
  assert_nil nil =~ Object.new
  assert_true nil.respond_to?(:=~)
  # `Kernel#!~` is `!(self =~ other)`, so it answers now that `=~` does.
  assert_true nil !~ "a"
  assert_raise(ArgumentError) { nil.=~() }
end

assert('safe navigation') do
  assert_nil nil&.size
  assert_equal 0, []&.size
end