diff --git a/jest.unit.config.json b/jest.unit.config.json
index 95d4a069..73cb09e0 100644
--- a/jest.unit.config.json
+++ b/jest.unit.config.json
@@ -36,5 +36,8 @@
       "sort": "status",
       "outputPath": "./out/Unit Tests Report.html"
     }]
+  ],
+  "setupFiles": [
+    "./spec/setup/test-setup.js"
   ]
 }
diff --git a/package.json b/package.json
index 65645dda..8f704a0a 100644
--- a/package.json
+++ b/package.json
@@ -80,6 +80,7 @@
   },
   "devDependencies": {
     "@types/auto-launch": "^5.0.0",
+    "@types/enzyme": "^3.9.0",
     "@types/ffi": "0.2.1",
     "@types/jest": "23.3.12",
     "@types/lodash.omit": "^4.5.4",
@@ -103,6 +104,8 @@
     "electron-chromedriver": "4.0.0-beta.1",
     "electron-packager": "13.0.1",
     "electron-rebuild": "1.8.2",
+    "enzyme": "^3.9.0",
+    "enzyme-adapter-react-16": "^1.10.0",
     "eslint": "5.6.1",
     "eslint-config-airbnb": "17.1.0",
     "eslint-plugin-import": "2.14.0",
diff --git a/spec/__snapshots__/downloadManager.spec.ts.snap b/spec/__snapshots__/downloadManager.spec.ts.snap
new file mode 100644
index 00000000..bec11331
--- /dev/null
+++ b/spec/__snapshots__/downloadManager.spec.ts.snap
@@ -0,0 +1,181 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`download manager should render correctly 1`] = `
+ShallowWrapper {
+  Symbol(enzyme.__root__): [Circular],
+  Symbol(enzyme.__unrendered__): <DownloadManager />,
+  Symbol(enzyme.__renderer__): Object {
+    "batchedUpdates": [Function],
+    "checkPropTypes": [Function],
+    "getNode": [Function],
+    "render": [Function],
+    "simulateError": [Function],
+    "simulateEvent": [Function],
+    "unmount": [Function],
+  },
+  Symbol(enzyme.__node__): Object {
+    "instance": null,
+    "key": undefined,
+    "nodeType": "host",
+    "props": Object {
+      "children": <div
+        className="download-bar"
+        id="download-manager-footer"
+      >
+        <ul
+          id="download-main"
+        />
+        <span
+          className="close-download-bar tempo-icon tempo-icon--close"
+          id="close-download-bar"
+          onClick={[Function]}
+        />
+      </div>,
+    },
+    "ref": null,
+    "rendered": Object {
+      "instance": null,
+      "key": undefined,
+      "nodeType": "host",
+      "props": Object {
+        "children": Array [
+          <ul
+            id="download-main"
+          />,
+          <span
+            className="close-download-bar tempo-icon tempo-icon--close"
+            id="close-download-bar"
+            onClick={[Function]}
+          />,
+        ],
+        "className": "download-bar",
+        "id": "download-manager-footer",
+      },
+      "ref": null,
+      "rendered": Array [
+        Object {
+          "instance": null,
+          "key": undefined,
+          "nodeType": "host",
+          "props": Object {
+            "children": Array [],
+            "id": "download-main",
+          },
+          "ref": null,
+          "rendered": Array [],
+          "type": "ul",
+        },
+        Object {
+          "instance": null,
+          "key": undefined,
+          "nodeType": "host",
+          "props": Object {
+            "className": "close-download-bar tempo-icon tempo-icon--close",
+            "id": "close-download-bar",
+            "onClick": [Function],
+          },
+          "ref": null,
+          "rendered": null,
+          "type": "span",
+        },
+      ],
+      "type": "div",
+    },
+    "type": "div",
+  },
+  Symbol(enzyme.__nodes__): Array [
+    Object {
+      "instance": null,
+      "key": undefined,
+      "nodeType": "host",
+      "props": Object {
+        "children": <div
+          className="download-bar"
+          id="download-manager-footer"
+        >
+          <ul
+            id="download-main"
+          />
+          <span
+            className="close-download-bar tempo-icon tempo-icon--close"
+            id="close-download-bar"
+            onClick={[Function]}
+          />
+        </div>,
+      },
+      "ref": null,
+      "rendered": Object {
+        "instance": null,
+        "key": undefined,
+        "nodeType": "host",
+        "props": Object {
+          "children": Array [
+            <ul
+              id="download-main"
+            />,
+            <span
+              className="close-download-bar tempo-icon tempo-icon--close"
+              id="close-download-bar"
+              onClick={[Function]}
+            />,
+          ],
+          "className": "download-bar",
+          "id": "download-manager-footer",
+        },
+        "ref": null,
+        "rendered": Array [
+          Object {
+            "instance": null,
+            "key": undefined,
+            "nodeType": "host",
+            "props": Object {
+              "children": Array [],
+              "id": "download-main",
+            },
+            "ref": null,
+            "rendered": Array [],
+            "type": "ul",
+          },
+          Object {
+            "instance": null,
+            "key": undefined,
+            "nodeType": "host",
+            "props": Object {
+              "className": "close-download-bar tempo-icon tempo-icon--close",
+              "id": "close-download-bar",
+              "onClick": [Function],
+            },
+            "ref": null,
+            "rendered": null,
+            "type": "span",
+          },
+        ],
+        "type": "div",
+      },
+      "type": "div",
+    },
+  ],
+  Symbol(enzyme.__options__): Object {
+    "adapter": ReactSixteenAdapter {
+      "options": Object {
+        "enableComponentDidUpdateOnSetState": true,
+        "legacyContextMode": "parent",
+        "lifecycles": Object {
+          "componentDidUpdate": Object {
+            "onSetState": true,
+          },
+          "getChildContext": Object {
+            "calledByRenderer": false,
+          },
+          "getDerivedStateFromProps": true,
+          "getSnapshotBeforeUpdate": true,
+          "setState": Object {
+            "skipsComponentDidUpdateOnNullish": true,
+          },
+        },
+      },
+    },
+  },
+  Symbol(enzyme.__childContext__): null,
+}
+`;
diff --git a/spec/downloadManager.spec.ts b/spec/downloadManager.spec.ts
new file mode 100644
index 00000000..22d2b737
--- /dev/null
+++ b/spec/downloadManager.spec.ts
@@ -0,0 +1,123 @@
+import { shallow, ShallowWrapper } from 'enzyme';
+import * as React from 'react';
+import DownloadManager from '../src/renderer/components/download-manager';
+
+describe('download manager', () => {
+    it('should render correctly', () => {
+        const wrapper = shallow(React.createElement(DownloadManager));
+
+        expect(wrapper).toMatchSnapshot();
+    });
+
+    it('should call `close` correctly', () => {
+        const spy: jest.SpyInstance = jest.spyOn(DownloadManager.prototype, 'setState');
+        const wrapper: ShallowWrapper = shallow(React.createElement(DownloadManager));
+
+        wrapper.find('#close-download-bar').simulate('click');
+
+        expect(spy).toBeCalledWith({ items: [], showMainComponent: true });
+    });
+
+    it('should call `injectItem` correctly', () => {
+        const { ipcRenderer } = require('./__mocks__/electron');
+        const spy: jest.SpyInstance = jest.spyOn(DownloadManager.prototype, 'setState');
+        const objectDownloadCompleted: object = {
+            _id: 1,
+            fileName: 'test.png',
+            savedPath: 'path://test',
+            total: 1,
+            flashing: false,
+        };
+
+        shallow(React.createElement(DownloadManager));
+
+        ipcRenderer.send('downloadCompleted', objectDownloadCompleted);
+
+        expect(spy).toBeCalledWith({
+            items: [{
+                _id: 1,
+                fileName: 'test.png',
+                savedPath: 'path://test',
+                total: 1,
+                flashing: false,
+            }], showMainComponent: true,
+        });
+    });
+
+    describe('download element ready', () => {
+        let wrapper: ShallowWrapper;
+        beforeEach(() => {
+            wrapper = shallow(React.createElement(DownloadManager));
+
+            wrapper.setState({
+                items: [
+                    {
+                        _id: 1,
+                        fileName: 'test.png',
+                        savedPath: 'path://test',
+                        total: 1,
+                        flashing: false,
+                    }],
+            });
+        });
+
+        it('should exist `download-element` class when there are items', () => {
+            expect(wrapper.find('.download-element')).toHaveLength(1);
+        });
+
+        it('should call `onOpenFile` correctly', () => {
+            const { ipcRenderer } = require('./__mocks__/electron');
+            const sendEventLabel: string = 'send';
+            const spy: jest.SpyInstance = jest.spyOn(ipcRenderer, sendEventLabel);
+
+            wrapper.find('#download-open').simulate('click');
+
+            expect(spy).toBeCalledWith('symphony-api', {
+                cmd: 'download-manager-action',
+                path: 'path://test',
+                type: 'open',
+             });
+        });
+
+        it('should call `showInFinder` correctly', () => {
+            const { ipcRenderer } = require('./__mocks__/electron');
+            const sendEventLabel: string = 'send';
+            const spy: jest.SpyInstance = jest.spyOn(ipcRenderer, sendEventLabel);
+
+            wrapper.find('#download-show-in-folder').simulate('click');
+
+            expect(spy).toBeCalledWith('symphony-api', {
+                cmd: 'download-manager-action',
+                path: 'path://test',
+                type: 'show',
+             });
+        });
+    });
+
+    describe('download completed event', () => {
+        const { ipcRenderer } = require('./__mocks__/electron');
+        const downloadCompletedLabelEvent: string = 'downloadCompleted';
+        const onLabelEvent: string = 'on';
+        const removeListenerLabelEvent: string = 'removeListener';
+
+        it('should call the `downloadCompleted event when mount component', () => {
+            const spy: jest.SpyInstance = jest.spyOn(ipcRenderer, onLabelEvent);
+
+            shallow(React.createElement(DownloadManager));
+
+            expect(spy).toBeCalledWith(downloadCompletedLabelEvent, expect.any(Function));
+        });
+
+        it('should remove listen `downloadCompleted` when component is unmount', () => {
+            const spyMount: jest.SpyInstance = jest.spyOn(ipcRenderer, onLabelEvent);
+            const spyUnmount: jest.SpyInstance = jest.spyOn(ipcRenderer, removeListenerLabelEvent);
+            const wrapper: ShallowWrapper = shallow(React.createElement(DownloadManager));
+
+            expect(spyMount).toBeCalledWith(downloadCompletedLabelEvent, expect.any(Function));
+
+            wrapper.unmount();
+
+            expect(spyUnmount).toBeCalledWith(downloadCompletedLabelEvent, expect.any(Function));
+        });
+    });
+});
diff --git a/spec/protocolHandler.spec.ts b/spec/protocolHandler.spec.ts
index fd811a54..edaf448a 100644
--- a/spec/protocolHandler.spec.ts
+++ b/spec/protocolHandler.spec.ts
@@ -13,7 +13,7 @@ jest.mock('../src/common/utils', () => {
 jest.mock('../src/common/env', () => {
     return {
         isWindowsOS: false,
-        isMac: true
+        isMac: true,
     };
 });
 
diff --git a/spec/setup/test-setup.js b/spec/setup/test-setup.js
new file mode 100644
index 00000000..ff46def6
--- /dev/null
+++ b/spec/setup/test-setup.js
@@ -0,0 +1,10 @@
+/**
+ * Defines the React 16 Adapter for Enzyme. 
+ *
+ * @link http://airbnb.io/enzyme/docs/installation/#working-with-react-16
+ * @copyright 2017 Airbnb, Inc.
+ */
+const enzyme = require("enzyme");
+const Adapter = require("enzyme-adapter-react-16");
+
+enzyme.configure({ adapter: new Adapter() });
\ No newline at end of file
diff --git a/src/renderer/components/download-manager.tsx b/src/renderer/components/download-manager.tsx
index d6e74cdd..b7fed733 100644
--- a/src/renderer/components/download-manager.tsx
+++ b/src/renderer/components/download-manager.tsx
@@ -83,7 +83,7 @@ export default class DownloadManager extends React.Component<{}, IManagerState>
         const fileDisplayName = this.getFileDisplayName(fileName);
         // TODO: fix flashing issue
         return (
-            <li id={_id} className='download-element'>
+            <li key={_id} id={_id} className='download-element'>
                 <div className='download-item' id='dl-item' onClick={this.eventHandlers.onOpenFile(_id)}>
                     <div className='file'>
                         <div id='download-progress' className='download-complete flash'>