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referee/tests/test_jsonio.py

@@ -0,0 +1,56 @@
+"""JSON 序列化与解析的规范化行为 [题面 附件2 4.1/5.1]。"""
+
+import json
+
+import pytest
+
+from referee.jsonio import (RequestFormatError, dumps, format_number,
+                            parse_request_object)
+
+
+@pytest.mark.parametrize("value,text", [
+    (105, "105"), (0, "0"), (5.0, "5"), (105.5, "105.5"),
+    (5282.843, "5282.843"),          # 微秒时刻的最短表示
+    (0.300001, "0.300001"),
+    (123.45, "123.45"),              # svd_deg 两位小数
+    (True, None),                    # 布尔不是数值，放这里只为参数化完整
+])
+def test_format_number(value, text):
+    if text is None:
+        return
+    assert format_number(value) == text
+
+
+def test_dumps_matches_official_number_style():
+    body = {"accepted": True, "virtual_time_s": 105.0,
+            "real_timestamp_ms": 1760000000000, "svd_deg": 123.45,
+            "note": "中文", "ok": False, "none": None, "list": [1, 2.5]}
+    text = dumps(body)
+    assert '"virtual_time_s":105' in text          # 不输出 105.0
+    assert '"svd_deg":123.45' in text
+    assert '"real_timestamp_ms":1760000000000' in text
+    assert '"note":"中文"' in text                  # 非 ASCII 不转义
+    assert json.loads(text) == body                 # 解析后语义不变
+
+
+@pytest.mark.parametrize("raw", [
+    b'{"a":1,"a":2}',                # 重复键
+    b'\xef\xbb\xbf{}',               # BOM
+    b'[]', b'"str"', b'3', b'null',  # 非对象
+    b'{"a":NaN}', b'{"a":Infinity}',
+    b'{"a":' + b'[' * 17 + b'0' + b']' * 17 + b'}',   # 深度 17
+    b'{"a":', b'', b'\xff',
+])
+def test_parse_rejections(raw):
+    with pytest.raises(RequestFormatError):
+        parse_request_object(raw)
+
+
+def test_parse_depth_16_is_legal():
+    payload = json.loads(b'{"extra":' + b'[' * 15 + b'0' + b']' * 15 + b'}')
+    assert parse_request_object(json.dumps(payload).encode()) == payload
+
+
+def test_parse_rejects_duplicated_nested_keys():
+    with pytest.raises(RequestFormatError):
+        parse_request_object(b'{"position":{"x":1,"x":2}}')