Added jest support

The placement of test files is the same as in vue-storefront
"src/**/test/unit/**/*.spec.(js|ts)".

Author: ResuBaka

package.json

@@ -31,6 +31,7 @@
     "migrate": "node node_modules/migrate/bin/migrate",
     "prestart": "npm run -s build",
     "test": "eslint src",
+    "test:unit": "jest -c test/unit/jest.conf.js",
     "setup": "npm run restore; npm run migrate",
     "lint": "eslint --ext .js src migrations scripts"
   },
@@ -100,11 +101,14 @@
     "@types/body-parser": "^1.17.0",
     "@types/config": "^0.0.34",
     "@types/express": "^4.16.1",
+    "@types/jest": "^24.0.11",
     "@types/node": "^11.13.4",
     "apollo-server-express": "^1.3.6",
     "cpx": "^1.5.0",
     "eslint": "^4.16.0",
+    "jest": "^24.8.0",
     "nodemon": "^1.18.7",
+    "ts-jest": "^24.0.2",
     "ts-node": "^8.1.0",
     "tslib": "^1.9.3",
     "typescript": "3.3.*"

test/unit/jest.conf.js

@@ -0,0 +1,26 @@
+module.exports = {
+  rootDir: '../../',
+  moduleFileExtensions: [
+    'js',
+    'ts',
+    'json'
+  ],
+  testMatch: [
+    '<rootDir>/src/**/test/unit/**/*.spec.(js|ts)',
+  ],
+  transform: {
+    '^.+\\.js$': '<rootDir>/node_modules/ts-jest',
+    '^.+\\.ts$': '<rootDir>/node_modules/ts-jest',
+  },
+  coverageDirectory: '<rootDir>/test/unit/coverage',
+  collectCoverageFrom: [
+    'src/**/*.{js,ts}',
+    '!src/**/types/*.{js,ts}',
+  ],
+  moduleNameMapper: {
+    '^src(.*)$': '<rootDir>/src$1'
+  },
+  transformIgnorePatterns: [
+    '<rootDir>/node_modules/(?!lodash)'
+  ]
+}