test(grout): replace jest with vitest (#5764)

libs/grout/.eslintignore

@@ -1,5 +1,6 @@
 *.js
 *.d.ts
+vitest.config.ts
 build
 coverage
 test-utils

libs/grout/package.json

@@ -15,9 +15,9 @@
     "lint:fix": "pnpm type-check && eslint . --fix",
     "pre-commit": "lint-staged",
     "test": "is-ci test:ci test:watch",
-    "test:ci": "jest --coverage --reporters=default --reporters=jest-junit --maxWorkers=6",
-    "test:coverage": "jest --coverage",
-    "test:watch": "jest --watch",
+    "test:ci": "vitest run --coverage",
+    "test:coverage": "vitest --coverage",
+    "test:watch": "vitest",
     "type-check": "tsc --build"
   },
   "dependencies": {
@@ -29,19 +29,16 @@
   "devDependencies": {
     "@types/debug": "4.1.8",
     "@types/express": "4.17.14",
-    "@types/jest": "^29.5.3",
     "@types/luxon": "^3.0.0",
     "@types/node-fetch": "^2.6.0",
+    "@vitest/coverage-istanbul": "^2.1.8",
     "eslint-plugin-vx": "workspace:*",
     "expect-type": "^0.15.0",
     "express": "4.18.2",
     "is-ci-cli": "2.2.0",
-    "jest": "^29.6.2",
-    "jest-junit": "^16.0.0",
-    "jest-watch-typeahead": "^2.2.2",
     "lint-staged": "11.0.0",
     "sort-package-json": "^1.50.0",
-    "ts-jest": "29.1.1"
+    "vitest": "^2.1.8"
   },
   "packageManager": "[email protected]"
 }

libs/grout/src/grout.test.ts

@@ -1,5 +1,6 @@
 /* eslint-disable no-unused-expressions */
 /* eslint-disable @typescript-eslint/require-await */
+import { expect, test, vi } from 'vitest';
 import { AddressInfo } from 'node:net';
 import express from 'express';
 import { err, ok, Result } from '@votingworks/basics';
@@ -83,7 +84,7 @@ test('registers Express routes for an API', async () => {
 });
 
 test('sends a 500 for unexpected errors', async () => {
-  const consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation();
+  const consoleErrorSpy = vi.spyOn(console, 'error').mockReturnValue();
   const api = createApi({
     async getStuff(): Promise<number> {
       throw new Error('Unexpected error');

libs/grout/src/serialization.test.ts

@@ -1,4 +1,5 @@
 /* eslint-disable @typescript-eslint/no-explicit-any */
+import { expect, test } from 'vitest';
 import { Buffer } from 'node:buffer';
 import { DateWithoutTime, err, ok } from '@votingworks/basics';
 import { DateTime } from 'luxon';

libs/grout/vitest.config.ts

@@ -0,0 +1,3 @@
+import { defineConfig } from '../../vitest.config.shared.mjs';
+
+export default defineConfig();

vitest.config.shared.mts

@@ -1,10 +1,10 @@
 import * as vitest from 'vitest/config';
-import { join } from 'node:path';
 
 const isCI = process.env['CI'] === 'true';
 
 export const base: vitest.ViteUserConfig = {
   test: {
+    include: ['src/**/*.test.{ts,tsx}', 'test/**/*.test.{ts,tsx}'],
     coverage: {
       thresholds: {
         lines: 100,