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diff --git a/spec/javascripts/u2f/register_spec.js.coffee b/spec/javascripts/u2f/register_spec.js.coffee
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+++ b/spec/javascripts/u2f/register_spec.js.coffee
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+#= require u2f/register
+#= require u2f/util
+#= require u2f/error
+#= require u2f
+#= require ./mock_u2f_device
+
+describe 'U2FRegister', ->
+  U2FUtil.enableTestMode()
+  fixture.load('u2f/register')
+
+  beforeEach ->
+    @u2fDevice = new MockU2FDevice
+    @container = $("#js-register-u2f")
+    @component = new U2FRegister(@container, $("#js-register-u2f-templates"), {}, "token")
+    @component.start()
+
+  it 'allows registering a U2F device', ->
+    setupButton = @container.find("#js-setup-u2f-device")
+    expect(setupButton.text()).toBe('Setup New U2F Device')
+    setupButton.trigger('click')
+
+    inProgressMessage = @container.children("p")
+    expect(inProgressMessage.text()).toContain("Trying to communicate with your device")
+
+    @u2fDevice.respondToRegisterRequest({deviceData: "this is data from the device"})
+    registeredMessage = @container.find('p')
+    deviceResponse = @container.find('#js-device-response')
+    expect(registeredMessage.text()).toContain("Your device was successfully set up!")
+    expect(deviceResponse.val()).toBe('{"deviceData":"this is data from the device"}')
+
+  describe "errors", ->
+    it "doesn't allow the same device to be registered twice (for the same user", ->
+      setupButton = @container.find("#js-setup-u2f-device")
+      setupButton.trigger('click')
+      @u2fDevice.respondToRegisterRequest({errorCode: 4})
+      errorMessage = @container.find("p")
+      expect(errorMessage.text()).toContain("already been registered with us")
+
+    it "displays an error message for other errors", ->
+      setupButton = @container.find("#js-setup-u2f-device")
+      setupButton.trigger('click')
+      @u2fDevice.respondToRegisterRequest({errorCode: "error!"})
+      errorMessage = @container.find("p")
+      expect(errorMessage.text()).toContain("There was a problem communicating with your device")
+
+    it "allows retrying registration after an error", ->
+      setupButton = @container.find("#js-setup-u2f-device")
+      setupButton.trigger('click')
+      @u2fDevice.respondToRegisterRequest({errorCode: "error!"})
+      retryButton = @container.find("#U2FTryAgain")
+      retryButton.trigger('click')
+
+      setupButton = @container.find("#js-setup-u2f-device")
+      setupButton.trigger('click')
+      @u2fDevice.respondToRegisterRequest({deviceData: "this is data from the device"})
+      registeredMessage = @container.find("p")
+      expect(registeredMessage.text()).toContain("Your device was successfully set up!")