fix: add test support

lib/parse-stylesheet/parse-stylesheet.test.ts

@@ -0,0 +1,5 @@
+describe('im a test', () => {
+  it('im a test', () => {
+    expect(true).toBe(true);
+  });
+})

package.json

@@ -13,6 +13,8 @@
     "url": "https://github.com/skynexui/responsive_stylesheet.git"
   },
   "scripts": {
+    "test": "jest",
+    "test:watch": "yarn test --watch",
     "build:watch": "rollup -cw",
     "build": "rollup -c",
     "export:types": "tsc",
@@ -24,23 +26,24 @@
     "@babel/plugin-proposal-private-property-in-object": "^7.16.5",
     "@babel/preset-env": "7.16.4",
     "@babel/preset-typescript": "^7.16.5",
-    "typescript": "4.3.5",
-    "rollup": "2.56.2",
     "@rollup/plugin-alias": "^3.1.8",
     "@rollup/plugin-babel": "^5.3.0",
     "@rollup/plugin-commonjs": "20.0.0",
     "@rollup/plugin-node-resolve": "13.0.4",
     "@rollup/plugin-typescript": "8.2.5",
-    "jest": "^28.1.3",
-    "rollup-plugin-dts": "^4.2.2",
-    "rollup-plugin-peer-deps-external": "^2.2.4",
     "@semantic-release/changelog": "5.0.1",
     "@semantic-release/commit-analyzer": "8.0.1",
     "@semantic-release/git": "9.0.0",
     "@semantic-release/github": "7.0.7",
     "@semantic-release/npm": "7.0.5",
     "@semantic-release/release-notes-generator": "9.0.1",
-    "semantic-release": "17.1.1"
+    "@types/jest": "^28.1.6",
+    "jest": "^28.1.3",
+    "rollup": "2.56.2",
+    "rollup-plugin-dts": "^4.2.2",
+    "rollup-plugin-peer-deps-external": "^2.2.4",
+    "semantic-release": "17.1.1",
+    "typescript": "4.3.5"
   },
   "release": {
     "plugins": [