refactor: move hoppscotch-common tests to vitest (#3154)

packages/hoppscotch-common/src/helpers/utils/__tests__/b64.spec.js

@@ -1,14 +1,11 @@
-import { TextDecoder } from "util"
+import { describe, expect, test } from "vitest"
 import { decodeB64StringToArrayBuffer } from "../b64"
 
 describe("decodeB64StringToArrayBuffer", () => {
   test("decodes content correctly", () => {
-    const decoder = new TextDecoder("utf-8")
     expect(
-      decoder.decode(
-        decodeB64StringToArrayBuffer("aG9wcHNjb3RjaCBpcyBhd2Vzb21lIQ==")
-      )
-    ).toMatch("hoppscotch is awesome!")
+      decodeB64StringToArrayBuffer("aG9wcHNjb3RjaCBpcyBhd2Vzb21lIQ==")
+    ).toEqual(Buffer.from("hoppscotch is awesome!", "utf-8").buffer)
   })
 
   // TODO : More tests for binary data ?