feat(G2-1,G2-2,G2-3): 扩展预算编号与工作流跨域桥接

server/tests/unit/budgetPool.service.test.js

@@ -0,0 +1,77 @@
+const {
+  resolveBudgetScope,
+  resolveBudgetScopeType,
+  selectBudgetPoolCandidate,
+} = require("../../src/services/budgetPool");
+
+describe("budgetPool service", () => {
+  it("resolves cost center scope with legal entity", () => {
+    expect(
+      resolveBudgetScope({
+        legalEntityId: "le-1",
+        costCenterId: "cc-1",
+      }),
+    ).toEqual({
+      scopeType: "cost_center_scoped",
+      departmentId: null,
+      legalEntityId: "le-1",
+      costCenterId: "cc-1",
+    });
+  });
+
+  it("rejects mixed department and master-data dimensions", () => {
+    expect(() =>
+      resolveBudgetScope({
+        departmentId: "dept-1",
+        legalEntityId: "le-1",
+      }),
+    ).toThrow(/参数校验失败/);
+  });
+
+  it("prefers cost center budget over department and global budgets", () => {
+    const selected = selectBudgetPoolCandidate(
+      [
+        { id: "global-1", department_id: null, legal_entity_id: null, cost_center_id: null },
+        { id: "dept-1", department_id: "dept-a", legal_entity_id: null, cost_center_id: null },
+        { id: "scope-1", department_id: null, legal_entity_id: "le-1", cost_center_id: "cc-1" },
+      ],
+      {
+        departmentId: "dept-a",
+        legalEntityId: "le-1",
+        costCenterId: "cc-1",
+      },
+    );
+
+    expect(selected?.id).toBe("scope-1");
+    expect(resolveBudgetScopeType(selected)).toBe("cost_center_scoped");
+  });
+
+  it("falls back to legacy department budget when no scoped budget exists", () => {
+    const selected = selectBudgetPoolCandidate(
+      [
+        { id: "global-1", department_id: null, legal_entity_id: null, cost_center_id: null },
+        { id: "dept-1", department_id: "dept-a", legal_entity_id: null, cost_center_id: null },
+      ],
+      {
+        departmentId: "dept-a",
+      },
+    );
+
+    expect(selected?.id).toBe("dept-1");
+  });
+
+  it("throws when same-priority pools are ambiguous", () => {
+    expect(() =>
+      selectBudgetPoolCandidate(
+        [
+          { id: "scope-1", department_id: null, legal_entity_id: "le-1", cost_center_id: "cc-1" },
+          { id: "scope-2", department_id: null, legal_entity_id: "le-1", cost_center_id: "cc-1" },
+        ],
+        {
+          legalEntityId: "le-1",
+          costCenterId: "cc-1",
+        },
+      ),
+    ).toThrow(/参数校验失败/);
+  });
+});