Fix duplicate keys preservation of JSON data (#1163)

* Fix duplicate keys preservation of JSON data

* Update issue number

* Fix type annotations

* Changes after review

* Rewording

tests/test_cli.py

@@ -1,20 +1,21 @@
 """CLI argument parsing related tests."""
 import argparse
-import json
 
 import pytest
 from requests.exceptions import InvalidSchema
 
 import httpie.cli.argparser
-from .fixtures import (
-    FILE_CONTENT, FILE_PATH, FILE_PATH_ARG, JSON_FILE_CONTENT,
-    JSON_FILE_PATH_ARG,
-)
-from httpie.status import ExitStatus
 from httpie.cli import constants
 from httpie.cli.definition import parser
 from httpie.cli.argtypes import KeyValueArg, KeyValueArgType
 from httpie.cli.requestitems import RequestItems
+from httpie.status import ExitStatus
+from httpie.utils import load_json_preserve_order_and_dupe_keys
+
+from .fixtures import (
+    FILE_CONTENT, FILE_PATH, FILE_PATH_ARG, JSON_FILE_CONTENT,
+    JSON_FILE_PATH_ARG,
+)
 from .utils import HTTP_OK, MockEnvironment, StdinBytesIO, http
 
 
@@ -97,17 +98,15 @@ class TestItemParsing:
 
         # Parsed data
         raw_json_embed = items.data.pop('raw-json-embed')
-        assert raw_json_embed == json.loads(JSON_FILE_CONTENT)
+        assert raw_json_embed == load_json_preserve_order_and_dupe_keys(JSON_FILE_CONTENT)
         items.data['string-embed'] = items.data['string-embed'].strip()
         assert dict(items.data) == {
-            "ed": "",
-            "string": "value",
-            "bool": True,
-            "list": ["a", 1, {}, False],
-            "obj": {
-                "a": "b"
-            },
-            "string-embed": FILE_CONTENT,
+            'ed': '',
+            'string': 'value',
+            'bool': True,
+            'list': ['a', 1, {}, False],
+            'obj': load_json_preserve_order_and_dupe_keys('{"a": "b"}'),
+            'string-embed': FILE_CONTENT,
         }
 
         # Parsed query string parameters