diff --git a/src/index.test.js b/src/index.test.js
new file mode 100644
index 0000000..c7fde20
--- /dev/null
+++ b/src/index.test.js
@@ -0,0 +1,12 @@
+/* global jest, test, expect */
+import bluetooth from '.';
+
+jest.mock('./webapp', () => null);
+jest.mock('./peripheral', () => null);
+
+test('actions', () => {
+  expect(Object.keys(bluetooth)).toEqual([
+    'peripheral',
+    'webapp',
+  ]);
+});
diff --git a/src/peripheral/index.test.js b/src/peripheral/index.test.js
new file mode 100644
index 0000000..21f5a54
--- /dev/null
+++ b/src/peripheral/index.test.js
@@ -0,0 +1,11 @@
+/* global jest, test, expect */
+import peripheral from '.';
+
+jest.mock('./bleno', () => ({
+  start: jest.fn().mockReturnValue('mockStart'),
+}));
+
+test('peripheral', () => {
+  const result = peripheral(null, null);
+  expect(result).toEqual('mockStart');
+});
diff --git a/src/webapp/central/central.js b/src/webapp/central/central.js
new file mode 100644
index 0000000..ccac90c
--- /dev/null
+++ b/src/webapp/central/central.js
@@ -0,0 +1,52 @@
+export default function Central(
+  bluetooth,
+  { encode, decode },
+  { SERVICE_UUID, CHARACTERISTIC_UUID }) {
+  const state = {
+    server: null,
+    characteristic: null,
+  };
+
+  const connect = name => bluetooth
+      .requestDevice({
+        filters: [{ services: [SERVICE_UUID], name }],
+      })
+      .then(device => device.gatt.connect())
+      .then((server) => {
+        state.server = server;
+        return server.getPrimaryService(SERVICE_UUID);
+      })
+      .then(service => service.getCharacteristic(CHARACTERISTIC_UUID))
+      .then((characteristic) => {
+        state.characteristic = characteristic;
+      });
+
+  const handler = callback => state.characteristic.startNotifications().then(() => {
+    const listerner = event => callback(decode(event.target.value));
+    state.characteristic.addEventListener('characteristicvaluechanged', listerner);
+    return listerner;
+  });
+
+  const read = () => {
+    if (state.server && state.server.connected && state.characteristic) {
+      return state.characteristic.readValue().then(data => decode(data));
+    }
+    return Promise.reject(new Error('Bluetooth: Not Connected'));
+  };
+
+  const write = (action) => {
+    if (!state.server || !state.server.connected || !state.characteristic) return null;
+    const stringify = JSON.stringify(action);
+    const serialized = encode(stringify);
+
+    return state.characteristic.writeValue(serialized);
+  };
+
+  return {
+    connected: state.server && state.server.connected,
+    connect,
+    handler,
+    read,
+    write,
+  };
+}
diff --git a/src/webapp/central/central.test.js b/src/webapp/central/central.test.js
new file mode 100644
index 0000000..fdec0d8
--- /dev/null
+++ b/src/webapp/central/central.test.js
@@ -0,0 +1,100 @@
+/* global jest, beforeEach, afterEach, test, expect */
+import { CENTRAL_CONFIG } from '../../common/config';
+import Central from './central';
+
+const encoder = {
+  encode: jest.fn().mockReturnValue('mockEncode'),
+  decode: jest.fn().mockReturnValue('mockDecode'),
+};
+
+const characteristic = {
+  startNotifications: jest.fn().mockReturnValue(Promise.resolve()),
+  addEventListener: jest.fn(),
+  writeValue: jest.fn().mockReturnValue(Promise.resolve()),
+  readValue: jest.fn().mockReturnValue(Promise.resolve('mockData')),
+};
+
+const service = {
+  getCharacteristic: jest.fn().mockReturnValue(Promise.resolve(characteristic)),
+};
+
+const server = {
+  connected: true,
+  getPrimaryService: jest.fn().mockReturnValue(Promise.resolve(service)),
+};
+
+const device = {
+  gatt: {
+    connect: jest.fn().mockReturnValue(Promise.resolve(server)),
+  },
+};
+
+const bluetooth = {
+  requestDevice: jest.fn().mockReturnValue(Promise.resolve(device)),
+};
+
+let central = null;
+
+beforeEach(() => {
+  central = new Central(bluetooth, encoder, CENTRAL_CONFIG);
+});
+
+afterEach(() => {
+  central = null;
+});
+
+
+test('Central: connect', () => {
+  expect.assertions(5);
+
+  const promise = central.connect('mockName').then(() => {
+    expect(bluetooth.requestDevice).toBeCalled();
+    expect(device.gatt.connect).toBeCalled();
+    expect(server.getPrimaryService).toBeCalled();
+    expect(service.getCharacteristic).toBeCalled();
+    return true;
+  });
+
+  return expect(promise).resolves.toBe(true);
+});
+
+test('Central: handler', () => {
+  const callback = jest.fn();
+  expect.assertions(3);
+
+  const promise = central.connect('mockName').then(() => central.handler(callback))
+  .then((listerner) => {
+    expect(characteristic.startNotifications).toBeCalled();
+    listerner({ target: { value: 'mockEvent' } });
+    expect(callback).toBeCalledWith('mockDecode');
+    return true;
+  });
+
+  return expect(promise).resolves.toBe(true);
+});
+
+test('Central: read', () => {
+  expect.assertions(2);
+
+  const promise = central.connect('mockName').then(() => central.read())
+  .then((data) => {
+    expect(characteristic.readValue).toBeCalled();
+    return data;
+  });
+
+  return expect(promise).resolves.toBe('mockDecode');
+});
+
+test('Central: write', () => {
+  expect.assertions(2);
+
+  const promise = central.connect('mockName')
+  .then(() => central.write({ type: 'ACTION' }))
+  .then(() => {
+    expect(characteristic.writeValue).toBeCalledWith('mockEncode');
+    return true;
+  });
+
+  return expect(promise).resolves.toBe(true);
+});
+
diff --git a/src/webapp/central/index.js b/src/webapp/central/index.js
index 401800a..8dcd158 100644
--- a/src/webapp/central/index.js
+++ b/src/webapp/central/index.js
@@ -1,57 +1,9 @@
+/* global navigator TextEncoder TextDecoder */
 import { CENTRAL_CONFIG } from '../../common/config';
 import Encoder from '../../common/encoder';
 
-export function Central(bluetooth, { encode, decode }, { SERVICE_UUID, CHARACTERISTIC_UUID }) {
-  const state = {
-    server: null,
-    characteristic: null,
-  };
+import Central from './central';
 
-  const connect = name => bluetooth
-      .requestDevice({
-        filters: [{ services: [SERVICE_UUID], name }],
-      })
-      .then(device => device.gatt.connect())
-      .then((server) => {
-        state.server = server;
-        return server.getPrimaryService(SERVICE_UUID);
-      })
-      .then(service => service.getCharacteristic(CHARACTERISTIC_UUID))
-      .then((characteristic) => {
-        state.characteristic = characteristic;
-      });
-
-  const handler = callback => state.characteristic.startNotifications().then(() => {
-    state.characteristic.addEventListener('characteristicvaluechanged', (event) => {
-      callback(decode(event.target.value));
-    });
-  });
-
-  const read = () => {
-    if (state.server && state.server.connected && state.characteristic) {
-      return state.characteristic.readValue().then(data => decode(data));
-    }
-    return Promise.reject(new Error('Bluetooth: Not Connected'));
-  };
-
-  const write = (action) => {
-    if (!state.server || !state.server.connected || !state.characteristic) return null;
-    const stringify = JSON.stringify(action);
-    const serialized = encode(stringify);
-
-    return state.characteristic.writeValue(serialized);
-  };
-
-  return {
-    connected: state.server && state.server.connected,
-    connect,
-    handler,
-    read,
-    write,
-  };
-}
-
-/* global navigator TextEncoder TextDecoder */
 export default new Central(
   navigator.bluetooth,
   Encoder({ TextEncoder, TextDecoder }),
diff --git a/src/webapp/middleware/index.test.js b/src/webapp/middleware/index.test.js
new file mode 100644
index 0000000..9293224
--- /dev/null
+++ b/src/webapp/middleware/index.test.js
@@ -0,0 +1,37 @@
+/* global jest, test, expect, beforeEach, afterEach */
+import middleware from '.';
+
+jest.mock('../actions', () => ({
+  sendAction: jest.fn().mockReturnValue('mockAction'),
+}));
+
+let store = null;
+let next = null;
+
+beforeEach(() => {
+  store = {
+    dispatch: jest.fn(),
+  };
+  next = jest.fn();
+});
+
+afterEach(() => {
+  store = null;
+  next = null;
+});
+
+test('actions empty', () => {
+  middleware()(store)(next)({ type: 'ACTION' });
+  expect(next).toBeCalledWith({ type: 'ACTION' });
+});
+
+test('actions not included', () => {
+  middleware(['ACTION'])(store)(next)({ type: 'NOTEXISTS' });
+  expect(next).toBeCalledWith({ type: 'NOTEXISTS' });
+});
+
+test('actions included', () => {
+  middleware(['ACTION'])(store)(next)({ type: 'ACTION' });
+  expect(store.dispatch).toBeCalledWith('mockAction');
+  expect(next).toBeCalledWith({ type: 'ACTION' });
+});
diff --git a/src/webapp/reducers/index.test.js b/src/webapp/reducers/index.test.js
index 7ce81b5..18e72d4 100644
--- a/src/webapp/reducers/index.test.js
+++ b/src/webapp/reducers/index.test.js
@@ -1,6 +1,18 @@
 /* global test, expect */
+import * as STATUS from '../central/status';
+import * as TYPES from '../actions/types';
+
+import initial from './initial';
 import Reducer from '.';
 
+test('Default State', () => {
+  const reducer = Reducer();
+
+  const nextState = reducer(undefined, { type: 'UNKNOWN' });
+
+  return expect(nextState).toBe(initial);
+});
+
 test('type: UNKNOWN', () => {
   const reducer = Reducer();
 
@@ -9,3 +21,40 @@ test('type: UNKNOWN', () => {
 
   return expect(nextState).toBe(originalState);
 });
+
+test('type: BLUETOOTH_CONNECTING', () => {
+  const reducer = Reducer();
+
+  const originalState = { };
+  const nextState = reducer(originalState, { type: TYPES.BLUETOOTH_CONNECTING });
+
+  return expect(nextState).toEqual({ status: STATUS.CONNECTING });
+});
+
+test('type: BLUETOOTH_CONNECTED', () => {
+  const reducer = Reducer();
+
+  const originalState = { };
+  const nextState = reducer(originalState, { type: TYPES.BLUETOOTH_CONNECTED });
+
+  return expect(nextState).toEqual({ status: STATUS.CONNECTED });
+});
+
+test('type: BLUETOOTH_SYNC', () => {
+  const reducer = Reducer();
+
+  const originalState = { };
+  const nextState = reducer(originalState, { type: TYPES.BLUETOOTH_SYNC, payload: 'mockPayload' });
+
+  return expect(nextState).toEqual({ store: 'mockPayload' });
+});
+
+test('type: BLUETOOTH_SYNC, autosync: false', () => {
+  const reducer = Reducer(false);
+
+  const originalState = { };
+  const nextState = reducer(originalState, { type: TYPES.BLUETOOTH_SYNC, payload: 'mockPayload' });
+
+  return expect(nextState).toEqual({ });
+});
+
diff --git a/src/webapp/reducers/initial.js b/src/webapp/reducers/initial.js
index e69de29..3868f3c 100644
--- a/src/webapp/reducers/initial.js
+++ b/src/webapp/reducers/initial.js
@@ -0,0 +1,3 @@
+import * as STATUS from '../central/status';
+
+export default { status: STATUS.INIT };
diff --git a/src/webapp/store/index.test.js b/src/webapp/store/index.test.js
new file mode 100644
index 0000000..ec8c866
--- /dev/null
+++ b/src/webapp/store/index.test.js
@@ -0,0 +1,16 @@
+/* global jest, test, expect */
+import createSyncStore from '.';
+
+jest.mock('redux', () => ({
+  createStore: jest.fn().mockReturnValue('mockStore'),
+  applyMiddleware: jest.fn(),
+  compose: jest.fn(),
+}));
+
+jest.mock('../middleware', () => jest.fn());
+jest.mock('../reducers', () => jest.fn());
+
+test('createSyncStore', () => {
+  const store = createSyncStore(['ACTION']);
+  return expect(store).toBe('mockStore');
+});