diff --git a/client/sw/register.spec.js b/client/sw/register.spec.js
new file mode 100644
index 00000000..a835aa70
--- /dev/null
+++ b/client/sw/register.spec.js
@@ -0,0 +1,176 @@
+'use strict';
+
+const test = require('tape');
+const sinon = require('sinon');
+const mock = require('mock-require');
+
+const SERVICE_WORKER = 'serviceworker-webpack-plugin/lib/runtime';
+
+test('sw: register: registerSW: no serviceWorker', async (t) => {
+    const {navigator} = global;
+    global.navigator = {};
+    
+    const register = sinon.stub();
+    
+    mock(SERVICE_WORKER, {
+        register
+    });
+    
+    const {
+        registerSW,
+    } = mock.reRequire('./register');
+    
+    await registerSW();
+    mock.stop(SERVICE_WORKER);
+    global.navigator = navigator;
+    
+    t.notOk(register.called, 'should not call register');
+    t.end();
+});
+
+test('sw: register: registerSW: no https', async (t) => {
+    const {
+        navigator,
+        location,
+    } = global;
+    
+    global.navigator = {
+        serviceWorker: true
+    };
+    
+    global.location = {
+        protocol: 'http:'
+    };
+    
+    const register = sinon.stub();
+    
+    mock(SERVICE_WORKER, {
+        register
+    });
+    
+    const {
+        registerSW,
+    } = mock.reRequire('./register');
+    
+    await registerSW();
+    
+    mock.stop(SERVICE_WORKER);
+    
+    global.location = location;
+    global.navigator = navigator;
+    
+    t.notOk(register.called, 'should not call register');
+    t.end();
+});
+
+test('sw: register: registerSW: no localhost', async (t) => {
+    const {
+        navigator,
+        location,
+    } = global;
+    
+    global.navigator = {
+        serviceWorker: true
+    };
+    
+    global.location = {
+        protocol: 'http:',
+        hostname: 'cloudcmd.io',
+    };
+    
+    const register = sinon.stub();
+    
+    mock(SERVICE_WORKER, {
+        register
+    });
+    
+    const {
+        registerSW,
+    } = mock.reRequire('./register');
+    
+    await registerSW();
+    
+    mock.stop(SERVICE_WORKER);
+    
+    global.location = location;
+    global.navigator = navigator;
+    
+    t.notOk(register.called, 'should not call register');
+    t.end();
+});
+
+test('sw: register: registerSW', async (t) => {
+    const {
+        navigator,
+        location,
+    } = global;
+    
+    global.navigator = {
+        serviceWorker: true
+    };
+    
+    global.location = {
+        hostname: 'localhost',
+    };
+    
+    const register = sinon.stub();
+    
+    mock(SERVICE_WORKER, {
+        register
+    });
+    
+    const {
+        registerSW,
+    } = mock.reRequire('./register');
+    
+    await registerSW();
+    
+    mock.stop(SERVICE_WORKER);
+    
+    global.location = location;
+    global.navigator = navigator;
+    
+    t.ok(register.calledWith(), 'should call register');
+    t.end();
+});
+
+test('sw: register: unregisterSW', async (t) => {
+    const {
+        navigator,
+        location,
+    } = global;
+    
+    global.navigator = {
+        serviceWorker: true
+    };
+    
+    global.location = {
+        hostname: 'localhost',
+    };
+    
+    const reg = {
+        unregister: sinon.stub()
+    };
+    
+    const register = sinon.stub()
+        .returns(Promise.resolve(reg));
+    
+    mock(SERVICE_WORKER, {
+        register
+    });
+    
+    const {
+        unregisterSW,
+    } = mock.reRequire('./register');
+    
+    await unregisterSW();
+    
+    mock.stop(SERVICE_WORKER);
+    
+    global.location = location;
+    global.navigator = navigator;
+    
+    t.ok(register.calledWith(), 'should call register');
+    t.end();
+});
+