core: use Jest for testing (#6)

Author: alfredoperez

angular.json

@@ -76,23 +76,9 @@
         "extract-i18n": {
           "builder": "@angular-devkit/build-angular:extract-i18n"
         },
-        "test": {
-           "builder": "@angular-devkit/build-angular:web-test-runner",
-          "options": {
-            "polyfills": ["zone.js", "zone.js/testing"],
-            "tsConfig": "tsconfig.spec.json",
-            "inlineStyleLanguage": "scss",
-            "assets": [
-              {
-                "glob": "**/*",
-                "input": "public"
-              },
-
-            ],
-            "styles": ["src/styles.scss"],
-            "scripts": []
-          }
-        },
+//        "test": {
+//          "builder": "@angular-builders/jest:run"
+//        },
         "storybook": {
           "builder": "@storybook/angular:start-storybook",
           "options": {

jest.config.js

@@ -0,0 +1,9 @@
+const { pathsToModuleNameMapper } = require('ts-jest');
+const { paths } = require('./tsconfig.json').compilerOptions;
+
+/** @type {import('ts-jest/dist/types').JestConfigWithTsJest} */
+module.exports = {
+  preset: 'jest-preset-angular',
+  moduleNameMapper: pathsToModuleNameMapper(paths, { prefix: '<rootDir>' }),
+  setupFilesAfterEnv: ['<rootDir>/setup-jest.ts'],
+};