feat: add collaborative math board and draw guess mode

backend/toolbox/test_views.py

@@ -1,5 +1,8 @@
 import pytest
 
+from accounts.models import User
+from toolbox.models import BoardSession
+
 
 @pytest.mark.django_db
 def test_calculator_api_公开访问并返回精确值(client):
@@ -23,3 +26,54 @@ def test_calculator_api_危险表达式返回四百(client):
 
     assert response.status_code == 400
     assert "error" in response.json()
+
+
+@pytest.mark.django_db
+def test_board_api_联机码加入你画我猜并服务端计分(client):
+    host = User.objects.create_user(
+        username="board_host",
+        password="StrongPass_2026",
+        nickname="画板房主",
+    )
+    guest = User.objects.create_user(
+        username="board_guest",
+        password="StrongPass_2026",
+        nickname="猜题玩家",
+    )
+    client.force_login(host)
+    created = client.post(
+        "/api/v1/toolbox/boards/",
+        {"mode": "draw_guess"},
+        content_type="application/json",
+    )
+    target = created.json()["target"]
+    code = created.json()["code"]
+    session_id = created.json()["session_id"]
+
+    client.force_login(guest)
+    joined = client.post(
+        "/api/v1/toolbox/boards/join/",
+        {"code": code.lower()},
+        content_type="application/json",
+    )
+    wrong = client.post(
+        f"/api/v1/toolbox/boards/{session_id}/guess/",
+        {"guess": "不是答案"},
+        content_type="application/json",
+    )
+    correct = client.post(
+        f"/api/v1/toolbox/boards/{session_id}/guess/",
+        {"guess": target},
+        content_type="application/json",
+    )
+
+    assert created.status_code == 201
+    assert created.json()["role"] == "host"
+    assert target
+    assert joined.status_code == 200
+    assert joined.json()["target"] is None
+    assert joined.json()["status"] == BoardSession.Status.ACTIVE
+    assert wrong.json()["correct"] is False
+    assert correct.json()["correct"] is True
+    assert correct.json()["guest_score"] == 1
+    assert correct.json()["status"] == BoardSession.Status.COMPLETED