Performance: reduce json data transformations (#7175)

src/widgets/miniflux/widget.test.js

@@ -1,4 +1,4 @@
-import { describe, it } from "vitest";
+import { describe, expect, it } from "vitest";
 
 import { expectWidgetConfigShape } from "test-utils/widget-config";
 
@@ -8,4 +8,12 @@ describe("miniflux widget config", () => {
   it("exports a valid widget config", () => {
     expectWidgetConfigShape(widget);
   });
+
+  it("sums read and unread counters", () => {
+    const result = widget.mappings.counters.map(
+      Buffer.from(JSON.stringify({ reads: { 1: 2, 2: 3 }, unreads: { 1: 4, 2: 1 } })),
+    );
+
+    expect(result).toEqual({ read: 5, unread: 5 });
+  });
 });