Added test cases

Author: Biboswan

interpreter/.vscode/settings.json

@@ -0,0 +1,2 @@
+{
+}

jsone.go

@@ -896,4 +896,4 @@ func render(template interface{}, context map[string]interface{}) (interface{},
 			Template: v,
 		}
 	}
-}
+}

specification.yml

@@ -49,28 +49,28 @@ result:   '{"Z":null,"a":{"b":["9",8,{}],"c":45},"q":1,"r":true}'
 ---
 title:   $json sorting unicode strings
 context:  {}
-template: {$json: {'\u3347\u0050': 1, '\uE1FF\u0010': 2, '\u0055\u0045': 3}}
-result:   '{"\\u0055\\u0045": 3, "\\u3347\\u0050": 1 , "\\uE1FF\\u0010": 2}'
+template: {$json: {"\u3347\u0050": 1, "\uE1FF\u0010": 2, "\u0055\u0045": 3}}
+result:   '{"\u0055\u0045": 3, "\u3347\u0050": 1 , "\uE1FF\u0010": 2}'
 ---
 title:   $json sorting unicode strings2
 context:  {}
-template: {$json: {'u005A\u10000\u0050': 1, '\u{E1FFF}\u0010': 2, '\u0055a\u0045': 3}}
-result:   '{"\\u0055a\\u0045": 3, "\\u005A\\u10000\\u0050": 1, "\\u{E1FFF}\\u0010": 2}'
+template: {$json: {"u005A\U00010000\u0050": 1, "\U000E1FFF\u0010": 2, "\u0055a\u0045": 3}}
+result:   '{"\u0055a\u0045": 3, "\u005A\u10000\u0050": 1, "\U000E1FFF\u0010": 2}'
 ---
 title:   $json sorting unicode strings3
 context:  {}
-template: {$json: {'e\u{E3FFE}\u732b':'hey', '\u0041\u0012\u107000':'hi', 'A\u{24000}':'hello'}}
-result:   '{"\\u0041\\u0012\\u107000":"hi", "A\\u{24000}":"hello", "e\\u{E3FFE}\\u732b":"hey"}'
+template: {$json: {"e\U000E3FFE\u732b":'hey', "\u0041\u0012\u107000":'hi', "A\U00024000":'hello'}}
+result:   '{"\u0041\u0012\u107000":"hi", "A\U00024000":"hello", "e\U000E3FFE\u732b":"hey"}'
 ---
 title:   $json sorting unicode strings4
 context:  {}
-template: {$json: {'e\u{E3FFE}\u732b':'hey', '\u0041\u{24000}\u107000':'hi', 'A\u4FFF':'hello'}}
-result:   '{"A\\u4FFF": "hello", "\\u0041\\u{24000}\\u107000": "hi", "e\\u{E3FFE}\\u732b": "hey" }'
+template: {$json: {"e\U000E3FFE\u732b":'hey', "\u0041\U00024000\u107000":'hi', "A\u4FFF":'hello'}}
+result:   '{"A\u4FFF": "hello", "\u0041\U00024000\u107000": "hi", "e\U000E3FFE\\u732b": "hey" }'
 ---
 title:   $json sorting unicode string5
 context:  {}
-template: {$json: {'\u{24000}\u732b':'hey', '\u007C\u{24000}\u107000':'hi', '\u0012\u{FFFF4}':'hello'}}
-result:   '{"A\\u4FFF": "hello", "\\u0041\\u{24000}\\u107000": "hi", "e\\u{E3FFE}\\u732b": "hey" }'
+template: {$json: {"\U00024000\u732b":'hey', "\u007C\U00024000\u107000":'hi', "\u0012\U000FFFF4":'hello'}}
+result:   '{"A\u4FFF": "hello", "\u0041\U00024000\u107000": "hi", "e\U000E3FFE\u732b": "hey" }'
 ---
 title:    string interpolation
 context:  {key: 'world', num: 1}