test case

Author: xinfei1

package.json

@@ -2,6 +2,12 @@
   "name": "react-grid-layout-between",
   "version": "0.1.0",
   "private": true,
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
   "dependencies": {
     "lodash": "^4.17.13",
     "mockjs": "^1.1.0",
@@ -11,12 +17,6 @@
     "react-dom": "^16.8.6",
     "react-scripts": "3.4.1"
   },
-  "scripts": {
-    "start": "react-scripts start",
-    "build": "react-scripts build",
-    "test": "react-scripts test",
-    "eject": "react-scripts eject"
-  },
   "eslintConfig": {
     "extends": "react-app"
   },

src/App.test.js

@@ -1,9 +1,26 @@
 import React from 'react';
 import ReactDOM from 'react-dom';
 import App from './App';
+import { collision } from './utils/collision';
 
 it('renders without crashing', () => {
   const div = document.createElement('div');
   ReactDOM.render(<App />, div);
   ReactDOM.unmountComponentAtNode(div);
 });
+
+test('collision interface', () => {
+  const a = {
+    gridx: 0,
+    gridy: 0,
+    width: 2,
+    height: 1
+  };
+  const b = {
+    gridx: 1,
+    gridy: 0,
+    width: 1,
+    height: 1
+  };
+  expect(collision(a,b)).toEqual(true);
+});