test: bump up Jest to v27 introducing new defaults

https://jestjs.io/blog/2021/05/25/jest-27

__tests__/checksums.test.ts

@@ -1,5 +1,6 @@
 import * as checksums from '../src/checksums'
 import nock from 'nock'
+import {afterEach, describe, expect, test} from '@jest/globals'
 
 test('fetches wrapper jars checksums', async () => {
   const validChecksums = await checksums.fetchValidChecksums(false)

__tests__/find.test.ts

@@ -1,5 +1,6 @@
 import * as path from 'path'
 import * as find from '../src/find'
+import {expect, test} from '@jest/globals'
 
 test('finds test data wrapper jars', async () => {
   const repoRoot = path.resolve('.')

__tests__/hash.test.ts

@@ -1,5 +1,6 @@
 import * as path from 'path'
 import * as hash from '../src/hash'
+import {expect, test} from '@jest/globals'
 
 test('can sha256 files', async () => {
   const sha = await hash.sha256File(

__tests__/validate.test.ts

@@ -1,5 +1,6 @@
 import * as path from 'path'
 import * as validate from '../src/validate'
+import {expect, test} from '@jest/globals'
 
 const baseDir = path.resolve('.')
 

jest.config.js

@@ -1,12 +1,8 @@
 module.exports = {
   clearMocks: true,
   moduleFileExtensions: ['js', 'ts', 'json'],
-  testEnvironment: 'node',
   testMatch: ['**/*.test.ts'],
-  testRunner: 'jest-circus/runner',
-  transform: {
-    '^.+\\.ts$': 'ts-jest'
-  },
+  preset: 'ts-jest',
   verbose: true,
   setupFilesAfterEnv: ['./jest.setup.js']
 }

package.json

@@ -30,19 +30,17 @@
     "unhomoglyph": "1.0.6"
   },
   "devDependencies": {
-    "@types/jest": "26.0.14",
     "@types/node": "12.12.62",
     "@typescript-eslint/parser": "4.2.0",
     "@vercel/ncc": "^0.29.0",
     "eslint": "7.9.0",
     "eslint-plugin-github": "4.1.1",
     "eslint-plugin-jest": "24.0.2",
-    "jest": "26.4.2",
-    "jest-circus": "26.4.2",
+    "jest": "^27.0.6",
     "js-yaml": "3.14.0",
     "nock": "^13.0.11",
     "prettier": "2.1.2",
-    "ts-jest": "26.4.0",
+    "ts-jest": "^27.0.3",
     "typescript": "4.0.3"
   }
 }