Fresh start

4 files changed, 692 insertions, 0 deletions

diff --git a/jni/ruby/test/psych/visitors/test_depth_first.rb b/jni/ruby/test/psych/visitors/test_depth_first.rb
new file mode 100644
index 0000000..837c8e8
--- /dev/null
+++ b/jni/ruby/test/psych/visitors/test_depth_first.rb
@@ -0,0 +1,49 @@
+require 'psych/helper'
+
+module Psych
+  module Visitors
+    class TestDepthFirst < TestCase
+      class Collector < Struct.new(:calls)
+        def initialize(calls = [])
+          super
+        end
+
+        def call obj
+          calls << obj
+        end
+      end
+
+      def test_scalar
+        collector = Collector.new
+        visitor   = Visitors::DepthFirst.new collector
+        visitor.accept Psych.parse_stream '--- hello'
+
+        assert_equal 3, collector.calls.length
+      end
+
+      def test_sequence
+        collector = Collector.new
+        visitor   = Visitors::DepthFirst.new collector
+        visitor.accept Psych.parse_stream "---\n- hello"
+
+        assert_equal 4, collector.calls.length
+      end
+
+      def test_mapping
+        collector = Collector.new
+        visitor   = Visitors::DepthFirst.new collector
+        visitor.accept Psych.parse_stream "---\nhello: world"
+
+        assert_equal 5, collector.calls.length
+      end
+
+      def test_alias
+        collector = Collector.new
+        visitor   = Visitors::DepthFirst.new collector
+        visitor.accept Psych.parse_stream "--- &yay\n- foo\n- *yay\n"
+
+        assert_equal 5, collector.calls.length
+      end
+    end
+  end
+end
diff --git a/jni/ruby/test/psych/visitors/test_emitter.rb b/jni/ruby/test/psych/visitors/test_emitter.rb
new file mode 100644
index 0000000..780c953
--- /dev/null
+++ b/jni/ruby/test/psych/visitors/test_emitter.rb
@@ -0,0 +1,144 @@
+require 'psych/helper'
+
+module Psych
+  module Visitors
+    class TestEmitter < TestCase
+      def setup
+        super
+        @io = StringIO.new
+        @visitor = Visitors::Emitter.new @io
+      end
+
+      def test_options
+        io = StringIO.new
+        visitor = Visitors::Emitter.new io, :indentation => 3
+
+        s       = Nodes::Stream.new
+        doc     = Nodes::Document.new
+        mapping = Nodes::Mapping.new
+        m2      = Nodes::Mapping.new
+        m2.children << Nodes::Scalar.new('a')
+        m2.children << Nodes::Scalar.new('b')
+
+        mapping.children << Nodes::Scalar.new('key')
+        mapping.children << m2
+        doc.children << mapping
+        s.children << doc
+
+        visitor.accept s
+        assert_match(/^[ ]{3}a/, io.string)
+      end
+
+      def test_stream
+        s = Nodes::Stream.new
+        @visitor.accept s
+        assert_equal '', @io.string
+      end
+
+      def test_document
+        s       = Nodes::Stream.new
+        doc     = Nodes::Document.new [1,1]
+        scalar  = Nodes::Scalar.new 'hello world'
+
+        doc.children << scalar
+        s.children << doc
+
+        @visitor.accept s
+
+        assert_match(/1.1/, @io.string)
+        assert_equal @io.string, s.yaml
+      end
+
+      def test_document_implicit_end
+        s       = Nodes::Stream.new
+        doc     = Nodes::Document.new
+        mapping = Nodes::Mapping.new
+        mapping.children << Nodes::Scalar.new('key')
+        mapping.children << Nodes::Scalar.new('value')
+        doc.children << mapping
+        s.children << doc
+
+        @visitor.accept s
+
+        assert_match(/key: value/, @io.string)
+        assert_equal @io.string, s.yaml
+        assert(/\.\.\./ !~ s.yaml)
+      end
+
+      def test_scalar
+        s       = Nodes::Stream.new
+        doc     = Nodes::Document.new
+        scalar  = Nodes::Scalar.new 'hello world'
+
+        doc.children << scalar
+        s.children << doc
+
+        @visitor.accept s
+
+        assert_match(/hello/, @io.string)
+        assert_equal @io.string, s.yaml
+      end
+
+      def test_scalar_with_tag
+        s       = Nodes::Stream.new
+        doc     = Nodes::Document.new
+        scalar  = Nodes::Scalar.new 'hello world', nil, '!str', false, false, 5
+
+        doc.children << scalar
+        s.children << doc
+
+        @visitor.accept s
+
+        assert_match(/str/, @io.string)
+        assert_match(/hello/, @io.string)
+        assert_equal @io.string, s.yaml
+      end
+
+      def test_sequence
+        s       = Nodes::Stream.new
+        doc     = Nodes::Document.new
+        scalar  = Nodes::Scalar.new 'hello world'
+        seq     = Nodes::Sequence.new
+
+        seq.children << scalar
+        doc.children << seq
+        s.children << doc
+
+        @visitor.accept s
+
+        assert_match(/- hello/, @io.string)
+        assert_equal @io.string, s.yaml
+      end
+
+      def test_mapping
+        s       = Nodes::Stream.new
+        doc     = Nodes::Document.new
+        mapping = Nodes::Mapping.new
+        mapping.children << Nodes::Scalar.new('key')
+        mapping.children << Nodes::Scalar.new('value')
+        doc.children << mapping
+        s.children << doc
+
+        @visitor.accept s
+
+        assert_match(/key: value/, @io.string)
+        assert_equal @io.string, s.yaml
+      end
+
+      def test_alias
+        s       = Nodes::Stream.new
+        doc     = Nodes::Document.new
+        mapping = Nodes::Mapping.new
+        mapping.children << Nodes::Scalar.new('key', 'A')
+        mapping.children << Nodes::Alias.new('A')
+        doc.children << mapping
+        s.children << doc
+
+        @visitor.accept s
+
+        assert_match(/&A key: \*A/, @io.string)
+        assert_equal @io.string, s.yaml
+      end
+    end
+  end
+end
diff --git a/jni/ruby/test/psych/visitors/test_to_ruby.rb b/jni/ruby/test/psych/visitors/test_to_ruby.rb
new file mode 100644
index 0000000..c13d980
--- /dev/null
+++ b/jni/ruby/test/psych/visitors/test_to_ruby.rb
@@ -0,0 +1,326 @@
+# coding: US-ASCII
+require 'psych/helper'
+
+module Psych
+  module Visitors
+    class TestToRuby < TestCase
+      def setup
+        super
+        @visitor = ToRuby.create
+      end
+
+      def test_object
+        mapping = Nodes::Mapping.new nil, "!ruby/object"
+        mapping.children << Nodes::Scalar.new('foo')
+        mapping.children << Nodes::Scalar.new('bar')
+
+        o = mapping.to_ruby
+        assert_equal 'bar', o.instance_variable_get(:@foo)
+      end
+
+      def test_tz_00_00_loads_without_error
+        assert Psych.load('1900-01-01T00:00:00+00:00')
+      end
+
+      def test_legacy_struct
+        foo = Struct.new('AWESOME', :bar)
+        assert_equal foo.new('baz'), Psych.load(<<-eoyml)
+!ruby/struct:AWESOME
+  bar: baz
+        eoyml
+      end
+
+      def test_binary
+        gif = "GIF89a\f\x00\f\x00\x84\x00\x00\xFF\xFF\xF7\xF5\xF5\xEE\xE9\xE9\xE5fff\x00\x00\x00\xE7\xE7\xE7^^^\xF3\xF3\xED\x8E\x8E\x8E\xE0\xE0\xE0\x9F\x9F\x9F\x93\x93\x93\xA7\xA7\xA7\x9E\x9E\x9Eiiiccc\xA3\xA3\xA3\x84\x84\x84\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9!\xFE\x0EMade with GIMP\x00,\x00\x00\x00\x00\f\x00\f\x00\x00\x05,  \x8E\x810\x9E\xE3@\x14\xE8i\x10\xC4\xD1\x8A\b\x1C\xCF\x80M$z\xEF\xFF0\x85p\xB8\xB01f\r\e\xCE\x01\xC3\x01\x1E\x10' \x82\n\x01\x00;"
+
+        hash = Psych.load(<<-'eoyaml')
+canonical: !!binary "\
+ R0lGODlhDAAMAIQAAP//9/X17unp5WZmZgAAAOfn515eXvPz7Y6OjuDg4J+fn5\
+ OTk6enp56enmlpaWNjY6Ojo4SEhP/++f/++f/++f/++f/++f/++f/++f/++f/+\
+ +f/++f/++f/++f/++f/++SH+Dk1hZGUgd2l0aCBHSU1QACwAAAAADAAMAAAFLC\
+ AgjoEwnuNAFOhpEMTRiggcz4BNJHrv/zCFcLiwMWYNG84BwwEeECcgggoBADs="
+generic: !binary |
+ R0lGODlhDAAMAIQAAP//9/X17unp5WZmZgAAAOfn515eXvPz7Y6OjuDg4J+fn5
+ OTk6enp56enmlpaWNjY6Ojo4SEhP/++f/++f/++f/++f/++f/++f/++f/++f/+
+ +f/++f/++f/++f/++f/++SH+Dk1hZGUgd2l0aCBHSU1QACwAAAAADAAMAAAFLC
+ AgjoEwnuNAFOhpEMTRiggcz4BNJHrv/zCFcLiwMWYNG84BwwEeECcgggoBADs=
+description:
+ The binary value above is a tiny arrow encoded as a gif image.
+        eoyaml
+        assert_equal gif, hash['canonical']
+        assert_equal gif, hash['generic']
+      end
+
+      A = Struct.new(:foo)
+
+      def test_struct
+        s = A.new('bar')
+
+        mapping = Nodes::Mapping.new nil, "!ruby/struct:#{s.class}"
+        mapping.children << Nodes::Scalar.new('foo')
+        mapping.children << Nodes::Scalar.new('bar')
+
+        ruby = mapping.to_ruby
+
+        assert_equal s.class, ruby.class
+        assert_equal s.foo, ruby.foo
+        assert_equal s, ruby
+      end
+
+      def test_anon_struct_legacy
+        s = Struct.new(:foo).new('bar')
+
+        mapping = Nodes::Mapping.new nil, '!ruby/struct:'
+        mapping.children << Nodes::Scalar.new('foo')
+        mapping.children << Nodes::Scalar.new('bar')
+
+        assert_equal s.foo, mapping.to_ruby.foo
+      end
+
+      def test_anon_struct
+        s = Struct.new(:foo).new('bar')
+
+        mapping = Nodes::Mapping.new nil, '!ruby/struct'
+        mapping.children << Nodes::Scalar.new('foo')
+        mapping.children << Nodes::Scalar.new('bar')
+
+        assert_equal s.foo, mapping.to_ruby.foo
+      end
+
+      def test_exception
+        exc = ::Exception.new 'hello'
+
+        mapping = Nodes::Mapping.new nil, '!ruby/exception'
+        mapping.children << Nodes::Scalar.new('message')
+        mapping.children << Nodes::Scalar.new('hello')
+
+        ruby = mapping.to_ruby
+
+        assert_equal exc.class, ruby.class
+        assert_equal exc.message, ruby.message
+      end
+
+      def test_regexp
+        node = Nodes::Scalar.new('/foo/', nil, '!ruby/regexp')
+        assert_equal(/foo/, node.to_ruby)
+
+        node = Nodes::Scalar.new('/foo/m', nil, '!ruby/regexp')
+        assert_equal(/foo/m, node.to_ruby)
+
+        node = Nodes::Scalar.new('/foo/ix', nil, '!ruby/regexp')
+        assert_equal(/foo/ix, node.to_ruby)
+      end
+
+      def test_time
+        now = Time.now
+        zone = now.strftime('%z')
+        zone = " #{zone[0,3]}:#{zone[3,5]}"
+
+        formatted = now.strftime("%Y-%m-%d %H:%M:%S.%9N") + zone
+
+        assert_equal now, Nodes::Scalar.new(formatted).to_ruby
+      end
+
+      def test_time_utc
+        now = Time.now.utc
+        formatted = now.strftime("%Y-%m-%d %H:%M:%S") +
+          ".%09dZ" % [now.nsec]
+
+        assert_equal now, Nodes::Scalar.new(formatted).to_ruby
+      end
+
+      def test_time_utc_no_z
+        now = Time.now.utc
+        formatted = now.strftime("%Y-%m-%d %H:%M:%S") +
+          ".%09d" % [now.nsec]
+
+        assert_equal now, Nodes::Scalar.new(formatted).to_ruby
+      end
+
+      def test_date
+        d = '1980-12-16'
+        actual = Date.strptime(d, '%Y-%m-%d')
+
+        date = Nodes::Scalar.new(d, nil, 'tag:yaml.org,2002:timestamp', false)
+
+        assert_equal actual, date.to_ruby
+      end
+
+      def test_rational
+        mapping = Nodes::Mapping.new nil, '!ruby/object:Rational'
+        mapping.children << Nodes::Scalar.new('denominator')
+        mapping.children << Nodes::Scalar.new('2')
+        mapping.children << Nodes::Scalar.new('numerator')
+        mapping.children << Nodes::Scalar.new('1')
+
+        assert_equal Rational(1,2), mapping.to_ruby
+      end
+
+      def test_complex
+        mapping = Nodes::Mapping.new nil, '!ruby/object:Complex'
+        mapping.children << Nodes::Scalar.new('image')
+        mapping.children << Nodes::Scalar.new('2')
+        mapping.children << Nodes::Scalar.new('real')
+        mapping.children << Nodes::Scalar.new('1')
+
+        assert_equal Complex(1,2), mapping.to_ruby
+      end
+
+      if RUBY_VERSION >= '1.9'
+        def test_complex_string
+          node = Nodes::Scalar.new '3+4i', nil, "!ruby/object:Complex"
+          assert_equal Complex(3, 4), node.to_ruby
+        end
+
+        def test_rational_string
+          node = Nodes::Scalar.new '1/2', nil, "!ruby/object:Rational"
+          assert_equal Rational(1, 2), node.to_ruby
+        end
+      end
+
+      def test_range_string
+        node = Nodes::Scalar.new '1..2', nil, "!ruby/range"
+        assert_equal 1..2, node.to_ruby
+      end
+
+      def test_range_string_triple
+        node = Nodes::Scalar.new '1...3', nil, "!ruby/range"
+        assert_equal 1...3, node.to_ruby
+      end
+
+      def test_integer
+        i = Nodes::Scalar.new('1', nil, 'tag:yaml.org,2002:int')
+        assert_equal 1, i.to_ruby
+
+        assert_equal 1, Nodes::Scalar.new('1').to_ruby
+
+        i = Nodes::Scalar.new('-1', nil, 'tag:yaml.org,2002:int')
+        assert_equal(-1, i.to_ruby)
+
+        assert_equal(-1, Nodes::Scalar.new('-1').to_ruby)
+        assert_equal 1, Nodes::Scalar.new('+1').to_ruby
+      end
+
+      def test_int_ignore
+        ['1,000', '1_000'].each do |num|
+          i = Nodes::Scalar.new(num, nil, 'tag:yaml.org,2002:int')
+          assert_equal 1000, i.to_ruby
+
+          assert_equal 1000, Nodes::Scalar.new(num).to_ruby
+        end
+      end
+
+      def test_float_ignore
+        ['1,000.3', '1_000.3'].each do |num|
+          i = Nodes::Scalar.new(num, nil, 'tag:yaml.org,2002:float')
+          assert_equal 1000.3, i.to_ruby
+
+          i = Nodes::Scalar.new(num, nil, '!float')
+          assert_equal 1000.3, i.to_ruby
+
+          assert_equal 1000.3, Nodes::Scalar.new(num).to_ruby
+        end
+      end
+
+      # http://yaml.org/type/bool.html
+      def test_boolean_true
+        %w{ yes Yes YES true True TRUE on On ON }.each do |t|
+          i = Nodes::Scalar.new(t, nil, 'tag:yaml.org,2002:bool')
+          assert_equal true, i.to_ruby
+          assert_equal true, Nodes::Scalar.new(t).to_ruby
+        end
+      end
+
+      # http://yaml.org/type/bool.html
+      def test_boolean_false
+        %w{ no No NO false False FALSE off Off OFF }.each do |t|
+          i = Nodes::Scalar.new(t, nil, 'tag:yaml.org,2002:bool')
+          assert_equal false, i.to_ruby
+          assert_equal false, Nodes::Scalar.new(t).to_ruby
+        end
+      end
+
+      def test_float
+        i = Nodes::Scalar.new('12', nil, 'tag:yaml.org,2002:float')
+        assert_equal 12.0, i.to_ruby
+
+        i = Nodes::Scalar.new('1.2', nil, 'tag:yaml.org,2002:float')
+        assert_equal 1.2, i.to_ruby
+
+        i = Nodes::Scalar.new('1.2')
+        assert_equal 1.2, i.to_ruby
+
+        assert_equal 1, Nodes::Scalar.new('.Inf').to_ruby.infinite?
+        assert_equal 1, Nodes::Scalar.new('.inf').to_ruby.infinite?
+        assert_equal 1, Nodes::Scalar.new('.Inf', nil, 'tag:yaml.org,2002:float').to_ruby.infinite?
+
+        assert_equal(-1, Nodes::Scalar.new('-.inf').to_ruby.infinite?)
+        assert_equal(-1, Nodes::Scalar.new('-.Inf').to_ruby.infinite?)
+        assert_equal(-1, Nodes::Scalar.new('-.Inf', nil, 'tag:yaml.org,2002:float').to_ruby.infinite?)
+
+        assert Nodes::Scalar.new('.NaN').to_ruby.nan?
+        assert Nodes::Scalar.new('.NaN', nil, 'tag:yaml.org,2002:float').to_ruby.nan?
+      end
+
+      def test_exp_float
+        exp = 1.2e+30
+
+        i = Nodes::Scalar.new(exp.to_s, nil, 'tag:yaml.org,2002:float')
+        assert_equal exp, i.to_ruby
+
+        assert_equal exp, Nodes::Scalar.new(exp.to_s).to_ruby
+      end
+
+      def test_scalar
+        scalar = Nodes::Scalar.new('foo')
+        assert_equal 'foo', @visitor.accept(scalar)
+        assert_equal 'foo', scalar.to_ruby
+      end
+
+      def test_sequence
+        seq = Nodes::Sequence.new
+        seq.children << Nodes::Scalar.new('foo')
+        seq.children << Nodes::Scalar.new('bar')
+
+        assert_equal %w{ foo bar }, seq.to_ruby
+      end
+
+      def test_mapping
+        mapping = Nodes::Mapping.new
+        mapping.children << Nodes::Scalar.new('foo')
+        mapping.children << Nodes::Scalar.new('bar')
+        assert_equal({'foo' => 'bar'}, mapping.to_ruby)
+      end
+
+      def test_document
+        doc = Nodes::Document.new
+        doc.children << Nodes::Scalar.new('foo')
+        assert_equal 'foo', doc.to_ruby
+      end
+
+      def test_stream
+        a = Nodes::Document.new
+        a.children << Nodes::Scalar.new('foo')
+
+        b = Nodes::Document.new
+        b.children << Nodes::Scalar.new('bar')
+
+        stream = Nodes::Stream.new
+        stream.children << a
+        stream.children << b
+
+        assert_equal %w{ foo bar }, stream.to_ruby
+      end
+
+      def test_alias
+        seq = Nodes::Sequence.new
+        seq.children << Nodes::Scalar.new('foo', 'A')
+        seq.children << Nodes::Alias.new('A')
+
+        list = seq.to_ruby
+        assert_equal %w{ foo foo }, list
+        assert_equal list[0].object_id, list[1].object_id
+      end
+    end
+  end
+end
diff --git a/jni/ruby/test/psych/visitors/test_yaml_tree.rb b/jni/ruby/test/psych/visitors/test_yaml_tree.rb
new file mode 100644
index 0000000..40702bc
--- /dev/null
+++ b/jni/ruby/test/psych/visitors/test_yaml_tree.rb
@@ -0,0 +1,173 @@
+require 'psych/helper'
+
+module Psych
+  module Visitors
+    class TestYAMLTree < TestCase
+      def setup
+        super
+        @v = Visitors::YAMLTree.create
+      end
+
+      def test_tree_can_be_called_twice
+        @v.start
+        @v << Object.new
+        t = @v.tree
+        assert_equal t, @v.tree
+      end
+
+      def test_yaml_tree_can_take_an_emitter
+        io = StringIO.new
+        e  = Psych::Emitter.new io
+        v = Visitors::YAMLTree.create({}, e)
+        v.start
+        v << "hello world"
+        v.finish
+
+        assert_match "hello world", io.string
+      end
+
+      def test_binary_formatting
+        gif = "GIF89a\f\x00\f\x00\x84\x00\x00\xFF\xFF\xF7\xF5\xF5\xEE\xE9\xE9\xE5fff\x00\x00\x00\xE7\xE7\xE7^^^\xF3\xF3\xED\x8E\x8E\x8E\xE0\xE0\xE0\x9F\x9F\x9F\x93\x93\x93\xA7\xA7\xA7\x9E\x9E\x9Eiiiccc\xA3\xA3\xA3\x84\x84\x84\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9\xFF\xFE\xF9!\xFE\x0EMade with GIMP\x00,\x00\x00\x00\x00\f\x00\f\x00\x00\x05,  \x8E\x810\x9E\xE3@\x14\xE8i\x10\xC4\xD1\x8A\b\x1C\xCF\x80M$z\xEF\xFF0\x85p\xB8\xB01f\r\e\xCE\x01\xC3\x01\x1E\x10' \x82\n\x01\x00;"
+        @v << gif
+        scalar = @v.tree.children.first.children.first
+        assert_equal Psych::Nodes::Scalar::LITERAL, scalar.style
+      end
+
+      def test_object_has_no_class
+        yaml = Psych.dump(Object.new)
+        assert(Psych.dump(Object.new) !~ /Object/, yaml)
+      end
+
+      def test_struct_const
+        foo = Struct.new("Foo", :bar)
+        assert_cycle foo.new('bar')
+        Struct.instance_eval { remove_const(:Foo) }
+      end
+
+      A = Struct.new(:foo)
+
+      def test_struct
+        assert_cycle A.new('bar')
+      end
+
+      def test_struct_anon
+        s = Struct.new(:foo).new('bar')
+        obj =  Psych.load(Psych.dump(s))
+        assert_equal s.foo, obj.foo
+      end
+
+      def test_override_method
+        s = Struct.new(:method).new('override')
+        obj =  Psych.load(Psych.dump(s))
+        assert_equal s.method, obj.method
+      end
+
+      def test_exception
+        ex = Exception.new 'foo'
+        loaded = Psych.load(Psych.dump(ex))
+
+        assert_equal ex.message, loaded.message
+        assert_equal ex.class, loaded.class
+      end
+
+      def test_regexp
+        assert_cycle(/foo/)
+        assert_cycle(/foo/i)
+        assert_cycle(/foo/mx)
+      end
+
+      def test_time
+        t = Time.now
+        assert_equal t, Psych.load(Psych.dump(t))
+      end
+
+      def test_date
+        date = Date.strptime('2002-12-14', '%Y-%m-%d')
+        assert_cycle date
+      end
+
+      def test_rational
+        assert_cycle Rational(1,2)
+      end
+
+      def test_complex
+        assert_cycle Complex(1,2)
+      end
+
+      def test_scalar
+        assert_cycle 'foo'
+        assert_cycle ':foo'
+        assert_cycle ''
+        assert_cycle ':'
+      end
+
+      def test_boolean
+        assert_cycle true
+        assert_cycle 'true'
+        assert_cycle false
+        assert_cycle 'false'
+      end
+
+      def test_range_inclusive
+        assert_cycle 1..2
+      end
+
+      def test_range_exclusive
+        assert_cycle 1...2
+      end
+
+      def test_anon_class
+        assert_raises(TypeError) do
+          @v.accept Class.new
+        end
+
+        assert_raises(TypeError) do
+          Psych.dump(Class.new)
+        end
+      end
+
+      def test_hash
+        assert_cycle('a' => 'b')
+      end
+
+      def test_list
+        assert_cycle(%w{ a b })
+        assert_cycle([1, 2.2])
+      end
+
+      def test_symbol
+        assert_cycle :foo
+      end
+
+      def test_int
+        assert_cycle 1
+        assert_cycle(-1)
+        assert_cycle '1'
+        assert_cycle '-1'
+      end
+
+      def test_float
+        assert_cycle 1.2
+        assert_cycle '1.2'
+
+        assert Psych.load(Psych.dump(0.0 / 0.0)).nan?
+        assert_equal 1, Psych.load(Psych.dump(1 / 0.0)).infinite?
+        assert_equal(-1, Psych.load(Psych.dump(-1 / 0.0)).infinite?)
+      end
+
+      # http://yaml.org/type/null.html
+      def test_nil
+        assert_cycle nil
+        assert_equal nil, Psych.load('null')
+        assert_equal nil, Psych.load('Null')
+        assert_equal nil, Psych.load('NULL')
+        assert_equal nil, Psych.load('~')
+        assert_equal({'foo' => nil}, Psych.load('foo: '))
+
+        assert_cycle 'null'
+        assert_cycle 'nUll'
+        assert_cycle '~'
+      end
+    end
+  end
+end