fix: unnecessary addition character appended on wallet.json

tests/govtool-frontend/playwright/lib/helpers/file.ts

@@ -1,4 +1,5 @@
-import { readFile, rm, writeFile } from "fs";
+import { faker } from "@faker-js/faker";
+import { readFile, rename, rm, writeFile } from "fs";
 const path = require("path");
 
 const mockFolderPath = path.resolve(__dirname, "../_mock");
@@ -20,6 +21,27 @@ export async function createFile(fileName: string, data?: any) {
   );
 }
 
+export async function renameFile(currentPath: string, newPath: string) {
+  await new Promise<void>((resolve, reject) =>
+    rename(currentPath, newPath, (err) => {
+      if (err) {
+        reject(err);
+      } else {
+        resolve();
+      }
+    })
+  );
+}
+
+export async function atomicWriteFile(fileName: string, data: any) {
+  const actualFilePath = `${mockFolderPath}/${fileName}`;
+  const tempFileName = `${faker.person.firstName()}-${faker.string.uuid()}.json`;
+  const tmpPath = `${mockFolderPath}/${tempFileName}`;
+
+  await createFile(tempFileName, data);
+  await renameFile(tmpPath, actualFilePath);
+}
+
 export async function getFile(fileName: string): Promise<any> {
   const data: string = await new Promise((resolve, reject) =>
     readFile(`${mockFolderPath}/${fileName}`, "utf8", (err, data) => {

tests/govtool-frontend/playwright/lib/walletManager.ts

@@ -1,6 +1,6 @@
 import { StaticWallet } from "@types";
 import { LockInterceptor } from "./lockInterceptor";
-import { createFile, getFile } from "@helpers/file";
+import { atomicWriteFile, createFile, getFile } from "@helpers/file";
 const path = require("path");
 
 const baseFilePath = path.resolve(__dirname, "./_mock");
@@ -73,7 +73,7 @@ class WalletManager {
         wallet.givenName = givenName;
       }
     });
-    await createFile("wallets.json", wallets);
+    await atomicWriteFile("wallets.json", wallets);
   }
 }
 export default WalletManager.getInstance();