First test!

src/widgets/backrest/proxy.js

@@ -7,14 +7,14 @@ import widgets from "widgets/widgets";
 const proxyName = "backrestProxyHandler";
 const logger = createLogger(proxyName);
 
-function sumField(plans, field) {
+export function sumField(plans, field) {
   return plans.reduce((sum, plan) => {
     const num = Number(plan[field]);
     return sum + (Number.isNaN(num) ? 0 : num);
   }, 0);
 }
 
-function buildResponse(plans) {
+export function buildResponse(plans) {
   const numSuccess30Days = sumField(plans, "backupsSuccessLast30days");
   const numFailure30Days = sumField(plans, "backupsFailed30days");
   const bytesAdded30Days = sumField(plans, "bytesAddedLast30days");

src/widgets/backrest/proxy.test.js

@@ -0,0 +1,37 @@
+import { describe, expect, it } from "vitest";
+
+import { buildResponse } from "./proxy";
+
+describe("backrest proxy buildResponse", () => {
+  it("aggregates plan metrics and latest status counts", () => {
+    const plans = [
+      {
+        backupsSuccessLast30days: 3,
+        backupsFailed30days: 1,
+        bytesAddedLast30days: 1000,
+        recentBackups: { status: ["STATUS_SUCCESS"] },
+      },
+      {
+        backupsSuccessLast30days: 2,
+        backupsFailed30days: 0,
+        bytesAddedLast30days: 500,
+        recentBackups: { status: ["STATUS_ERROR"] },
+      },
+      {
+        backupsSuccessLast30days: "not-a-number",
+        backupsFailed30days: 4,
+        bytesAddedLast30days: 250,
+        recentBackups: { status: [] },
+      },
+    ];
+
+    expect(buildResponse(plans)).toEqual({
+      numPlans: 3,
+      numSuccess30Days: 5,
+      numFailure30Days: 5,
+      numSuccessLatest: 1,
+      numFailureLatest: 1,
+      bytesAdded30Days: 1750,
+    });
+  });
+});