fix(json): Escape most used special characters (such as \n, \t)

Fix #18

src/polyfills/json/__init__.py

@@ -15,6 +15,17 @@
 
 __all__ = ["dumps", "dump", "loads", "load"]
 
+# From the builtin `json` module:
+ESCAPE_DCT = {
+    '\\': '\\\\',
+    '"': '\\"',
+    '\b': '\\b',
+    '\f': '\\f',
+    '\n': '\\n',
+    '\r': '\\r',
+    '\t': '\\t',
+}
+
 
 class BaseJSONError(Exception):
     """ Base exception for the JSON library. """
@@ -32,9 +43,10 @@ def escape_string(string):
     Returns:
         str: The escaped string.
     """
-    return string \
-        .replace("\\", "\\\\") \
-        .replace('"', '\\"')
+    for special_char in ESCAPE_DCT.keys():
+        string = string.replace(special_char, ESCAPE_DCT[special_char])
+
+    return string
 
 def dumps(
         obj,

src/polyfills/json/tests/dumps/test_dumps.py

@@ -169,6 +169,11 @@ def test_escape(self):
             r"""{"k\\ey": "va\\lue"}""",
             "Backslashes should be escaped both in keys and values"
         )
+        self.assertEqual(
+            json.dumps("test\ntest"),
+            '"test\\ntest"',
+            "Newlines should be escaped"
+        )
 
     def test_complex(self):
         if str(1==1) == 'True':