jest: fix jest config.

Author: jaywcjlove

package.json

@@ -33,6 +33,15 @@
       "prettier --write"
     ]
   },
+  "jest": {
+    "collectCoverageFrom": [
+      "<rootDir>/core/src/*.{tsx,ts}"
+    ],
+    "coverageReporters": [
+      "lcov",
+      "json-summary"
+    ]
+  },
   "devDependencies": {
     "@kkt/ncc": "^1.0.15",
     "@kkt/less-modules": "^7.5.2",

test/index.test.tsx

@@ -4,7 +4,7 @@
 import { render, screen } from '@testing-library/react';
 import '@testing-library/jest-dom';
 import React from 'react';
-import Split from '../core';
+import Split from '../core/src/';
 
 test('renders react-split', () => {
   render(