Add ActiveSupport::JSON and Object#to_json for converting Ruby objects to JSON strings

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@3356 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 53 insertions, 0 deletions

diff --git a/activesupport/test/json.rb b/activesupport/test/json.rb
new file mode 100644
index 0000000000..c5b597abd7
--- /dev/null
+++ b/activesupport/test/json.rb
@@ -0,0 +1,53 @@
+$:.unshift File.dirname(__FILE__) + '/../lib'
+require 'active_support'
+require 'test/unit'
+
+class Foo
+  def initialize(a, b)
+    @a, @b = a, b
+  end
+end
+
+class TestJSONEmitters < Test::Unit::TestCase
+  TrueTests    = [[ true,  %(true)  ]]
+  FalseTests   = [[ false, %(false) ]]
+  NilTests     = [[ nil,   %(null)  ]]
+  NumericTests = [[ 1,     %(1)     ],
+                  [ 2.5,   %(2.5)   ]]
+                    
+  StringTests  = [[ 'this is the string',     %("this is the string")         ],
+                  [ 'a "string" with quotes', %("a \\"string\\" with quotes") ]]
+                 
+  ArrayTests   = [[ ['a', 'b', 'c'],          %([\"a\", \"b\", \"c\"])          ],
+                  [ [1, 'a', :b, nil, false], %([1, \"a\", \"b\", null, false]) ]]
+  
+  HashTests    = [[ {:a => :b, :c => :d}, %({\"c\": \"d\", \"a\": \"b\"}) ]]
+                  
+  SymbolTests  = [[ :a,     %("a")    ],
+                  [ :this,  %("this") ],
+                  [ :"a b", %("a b")  ]]
+
+  ObjectTests  = [[ Foo.new(1, 2), %({\"a\": 1, \"b\": 2}) ]]
+  
+  constants.grep(/Tests$/).each do |class_tests|
+    define_method("test_#{class_tests[0..-6].downcase}") do
+      self.class.const_get(class_tests).each do |pair|
+        assert_equal pair.last, pair.first.to_json
+      end
+    end
+  end
+  
+  def test_utf8_string_encoded_properly_when_kcode_is_utf8
+    old_kcode, $KCODE = $KCODE, 'UTF8'
+    assert_equal '"\\u20ac2.99"', '€2.99'.to_json
+    assert_equal '"\\u270e\\u263a"', '✎☺'.to_json
+  ensure
+    $KCODE = old_kcode
+  end
+  
+  def test_exception_raised_when_encoding_circular_reference
+    a = [1]
+    a << a
+    assert_raises(ActiveSupport::JSON::CircularReferenceError) { a.to_json }
+  end
+end