v0.2 Preview: Construction Plan.

backend/accounts/test_serializers.py

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+from datetime import timedelta
+
+import pytest
+from django.utils import timezone
+from rest_framework import serializers
+
+from accounts.models import InviteCode, InviteCodeUsage, User
+from accounts.serializers import RegisterSerializer
+
+
+def registration_data(code="VALID-CODE", username="math_user"):
+    return {
+        "invite_code": code,
+        "username": username,
+        "password": "StrongPass_2026",
+        "nickname": "数学少年",
+        "track": User.Track.STANDARD,
+    }
+
+
+@pytest.mark.django_db
+def test_register_serializer_有效邀请码创建用户并原子消费():
+    invite = InviteCode.objects.create(code="VALID-CODE", max_uses=1)
+    serializer = RegisterSerializer(
+        data=registration_data(),
+        context={"ip_address": "127.0.0.1"},
+    )
+
+    assert serializer.is_valid(), serializer.errors
+    user = serializer.save()
+
+    invite.refresh_from_db()
+    assert invite.used_count == 1
+    assert user.check_password("StrongPass_2026")
+    usage = InviteCodeUsage.objects.get(user=user)
+    assert usage.invite_code == invite
+    assert usage.ip_address == "127.0.0.1"
+
+
+@pytest.mark.django_db
+def test_register_serializer_过期邀请码拒绝创建用户():
+    InviteCode.objects.create(
+        code="EXPIRED",
+        max_uses=1,
+        expires_at=timezone.now() - timedelta(seconds=1),
+    )
+    serializer = RegisterSerializer(data=registration_data(code="EXPIRED"))
+
+    assert serializer.is_valid(), serializer.errors
+    with pytest.raises(serializers.ValidationError, match="已过期或已用完"):
+        serializer.save()
+    assert User.objects.count() == 0
+
+
+@pytest.mark.django_db
+def test_register_serializer_用户名大小写重复时校验失败():
+    User.objects.create_user(
+        username="Math_User",
+        password="StrongPass_2026",
+        nickname="已有用户",
+    )
+    serializer = RegisterSerializer(data=registration_data(username="math_user"))
+
+    assert not serializer.is_valid()
+    assert "用户名已存在" in str(serializer.errors["username"])
+
+
+@pytest.mark.django_db
+def test_register_serializer_游客迁移字段类型错误时拒绝():
+    InviteCode.objects.create(code="VALID-CODE", max_uses=1)
+    data = registration_data()
+    data["visitor_data"] = {"favorites": None}
+    serializer = RegisterSerializer(data=data)
+
+    assert not serializer.is_valid()
+    assert "favorites 必须是数组" in str(serializer.errors["visitor_data"])