Track HiveGrid Cloud planning reference

hivegrid-cloud/apps/web/app/utils/integrations/taskService.assignment.test.ts

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+import { describe, expect, it } from "vitest";
+
+import { resolveAssignment, TaskServiceError } from "./taskService.server";
+
+/**
+ * Single-assignee rule (AK-P4b DoD 2): a task is assigned to exactly one of a
+ * user or a group; default = creator. Pure logic, no DB.
+ */
+describe("resolveAssignment", () => {
+  it("defaults to the creator when neither user nor group is given", () => {
+    expect(resolveAssignment({ creatorUserId: "u-creator" })).toEqual({
+      assignedToUserId: "u-creator",
+      assignedToGroupId: null,
+    });
+  });
+
+  it("keeps a single user assignment", () => {
+    expect(resolveAssignment({ creatorUserId: "u-creator", assignedToUserId: "u-1" })).toEqual({
+      assignedToUserId: "u-1",
+      assignedToGroupId: null,
+    });
+  });
+
+  it("keeps a single group assignment", () => {
+    expect(resolveAssignment({ creatorUserId: "u-creator", assignedToGroupId: "g-1" })).toEqual({
+      assignedToUserId: null,
+      assignedToGroupId: "g-1",
+    });
+  });
+
+  it("rejects assigning to both a user and a group", () => {
+    expect(() => resolveAssignment({ creatorUserId: "u-creator", assignedToUserId: "u-1", assignedToGroupId: "g-1" })).toThrow(TaskServiceError);
+  });
+});