try on Node 15

Author: Chiu Peter

.github/workflows/jest_tests.yml

@@ -22,7 +22,7 @@ jobs:
       - name: Use Node.js
         uses: actions/setup-node@v1
         with:
-          node-version: 12.x
+          node-version: 15.x
           registry-url: https://registry.npmjs.org/
           scope: '@mat-github-ci'
         env:

jest.config.js

@@ -23,7 +23,7 @@ module.exports = {
   setupFilesAfterEnv: ['./src/jest-setup.ts'],
   globals: {
     'ts-jest': {
-      tsConfig: './tsconfig.json',
+      tsconfig: './tsconfig.json',
       isolatedModules: true
     }
   }