Added testing

__tests__/index.spec.js

@@ -0,0 +1,40 @@
+import React from 'react';
+import {shallow, mount} from 'enzyme';
+import Perimeter from '../src';
+
+let component;
+let mountedComponent;
+let shallowComponent;
+let onBreachFunction = jest.fn();
+
+describe('Perimeter', () => {
+  beforeEach(() => {
+    window.addEventListener = jest.fn();
+    window.removeEventListener = jest.fn();
+
+    component = (
+      <Perimeter
+        onBreach={onBreachFunction}
+        padding={300}
+      >
+        <div className="perimeter-component">Perimeter</div>
+      </Perimeter>
+    );
+
+    shallowComponent = shallow(component)
+    mountedComponent = mount(component);
+  });
+  it('should return react component', () => {
+    expect(shallowComponent.length).toBe(1);
+  });
+  it('should render children', () => {
+    expect(shallowComponent.find(".perimeter-component").props().children).toBe("Perimeter");
+  });
+  it('should addEventListener on mount', () => {
+    expect(addEventListener).toHaveBeenCalledTimes(2);
+  });
+  it('should removeEventListener on unmount', () => {
+    mountedComponent.unmount();
+    expect(removeEventListener).toHaveBeenCalledTimes(2);
+  });
+});

package.json

@@ -5,7 +5,8 @@
   "license": "MIT",
   "scripts": {
     "build": "rimraf lib && babel src --out-dir lib",
-    "prepublish": "npm run build"
+    "prepublish": "npm run build",
+    "test": "jest"
   },
   "repository": {
     "type": "git",
@@ -21,7 +22,12 @@
     "babel-plugin-transform-class-properties": "^6.23.0",
     "babel-preset-env": "^1.2.2",
     "babel-preset-react": "^6.23.0",
+    "enzyme": "^2.7.1",
     "flow-bin": "^0.41.0",
+    "jest": "^19.0.2",
+    "react": "^15.4.2",
+    "react-addons-test-utils": "^15.4.2",
+    "react-dom": "^15.4.2",
     "rimraf": "^2.6.1"
   },
   "peerDependencies": {