diff --git a/ui/app/components/error-message/tests/error-message.component.test.js b/ui/app/components/error-message/tests/error-message.component.test.js
new file mode 100644
index 000000000..8c5347173
--- /dev/null
+++ b/ui/app/components/error-message/tests/error-message.component.test.js
@@ -0,0 +1,36 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow } from 'enzyme'
+import ErrorMessage from '../error-message.component'
+
+describe('ErrorMessage Component', () => {
+  const t = key => `translate ${key}`
+
+  it('should render a message from props.errorMessage', () => {
+    const wrapper = shallow(
+      <ErrorMessage
+        errorMessage="This is an error."
+      />,
+      { context: { t }}
+    )
+
+    assert.ok(wrapper)
+    assert.equal(wrapper.find('.error-message').length, 1)
+    assert.equal(wrapper.find('.error-message__icon').length, 1)
+    assert.equal(wrapper.find('.error-message__text').text(), 'ALERT: This is an error.')
+  })
+
+  it('should render a message translated from props.errorKey', () => {
+    const wrapper = shallow(
+      <ErrorMessage
+        errorKey="testKey"
+      />,
+      { context: { t }}
+    )
+
+    assert.ok(wrapper)
+    assert.equal(wrapper.find('.error-message').length, 1)
+    assert.equal(wrapper.find('.error-message__icon').length, 1)
+    assert.equal(wrapper.find('.error-message__text').text(), 'ALERT: translate testKey')
+  })
+})
diff --git a/ui/app/components/modal/modal-content/modal-content.component.js b/ui/app/components/modal/modal-content/modal-content.component.js
index 8beb854e0..ecec0ee5b 100644
--- a/ui/app/components/modal/modal-content/modal-content.component.js
+++ b/ui/app/components/modal/modal-content/modal-content.component.js
@@ -12,12 +12,20 @@ export default class ModalContent extends PureComponent {
 
     return (
       <div className="modal-content">
-        <div className="modal-content__title">
-          { title }
-        </div>
-        <div className="modal-content__description">
-          { description }
-        </div>
+        {
+          title && (
+            <div className="modal-content__title">
+              { title }
+            </div>
+          )
+        }
+        {
+          description && (
+            <div className="modal-content__description">
+              { description }
+            </div>
+          )
+        }
       </div>
     )
   }
diff --git a/ui/app/components/modal/modal-content/tests/modal-content.component.test.js b/ui/app/components/modal/modal-content/tests/modal-content.component.test.js
new file mode 100644
index 000000000..17af09f45
--- /dev/null
+++ b/ui/app/components/modal/modal-content/tests/modal-content.component.test.js
@@ -0,0 +1,44 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow } from 'enzyme'
+import ModalContent from '../modal-content.component'
+
+describe('ModalContent Component', () => {
+  it('should render a title', () => {
+    const wrapper = shallow(
+      <ModalContent
+        title="Modal Title"
+      />
+    )
+
+    assert.equal(wrapper.find('.modal-content__title').length, 1)
+    assert.equal(wrapper.find('.modal-content__title').text(), 'Modal Title')
+    assert.equal(wrapper.find('.modal-content__description').length, 0)
+  })
+
+  it('should render a description', () => {
+    const wrapper = shallow(
+      <ModalContent
+        description="Modal Description"
+      />
+    )
+
+    assert.equal(wrapper.find('.modal-content__title').length, 0)
+    assert.equal(wrapper.find('.modal-content__description').length, 1)
+    assert.equal(wrapper.find('.modal-content__description').text(), 'Modal Description')
+  })
+
+  it('should render both a title and a description', () => {
+    const wrapper = shallow(
+      <ModalContent
+        title="Modal Title"
+        description="Modal Description"
+      />
+    )
+
+    assert.equal(wrapper.find('.modal-content__title').length, 1)
+    assert.equal(wrapper.find('.modal-content__title').text(), 'Modal Title')
+    assert.equal(wrapper.find('.modal-content__description').length, 1)
+    assert.equal(wrapper.find('.modal-content__description').text(), 'Modal Description')
+  })
+})
diff --git a/ui/app/components/modal/tests/modal.component.test.js b/ui/app/components/modal/tests/modal.component.test.js
new file mode 100644
index 000000000..31457751f
--- /dev/null
+++ b/ui/app/components/modal/tests/modal.component.test.js
@@ -0,0 +1,117 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow } from 'enzyme'
+import sinon from 'sinon'
+import Modal from '../modal.component'
+import Button from '../../button'
+
+describe('Modal Component', () => {
+  it('should render a modal with a submit button', () => {
+    const wrapper = shallow(<Modal />)
+
+    assert.equal(wrapper.find('.modal-container').length, 1)
+    const buttons = wrapper.find(Button)
+    assert.equal(buttons.length, 1)
+    assert.equal(buttons.at(0).props().type, 'primary')
+  })
+
+  it('should render a modal with a cancel and a submit button', () => {
+    const handleCancel = sinon.spy()
+    const handleSubmit = sinon.spy()
+    const wrapper = shallow(
+      <Modal
+        onCancel={handleCancel}
+        cancelText="Cancel"
+        onSubmit={handleSubmit}
+        submitText="Submit"
+      />
+    )
+
+    const buttons = wrapper.find(Button)
+    assert.equal(buttons.length, 2)
+    const cancelButton = buttons.at(0)
+    const submitButton = buttons.at(1)
+
+    assert.equal(cancelButton.props().type, 'default')
+    assert.equal(cancelButton.props().children, 'Cancel')
+    assert.equal(handleCancel.callCount, 0)
+    cancelButton.simulate('click')
+    assert.equal(handleCancel.callCount, 1)
+
+    assert.equal(submitButton.props().type, 'primary')
+    assert.equal(submitButton.props().children, 'Submit')
+    assert.equal(handleSubmit.callCount, 0)
+    submitButton.simulate('click')
+    assert.equal(handleSubmit.callCount, 1)
+  })
+
+  it('should render a modal with different button types', () => {
+    const wrapper = shallow(
+      <Modal
+        onCancel={() => {}}
+        cancelText="Cancel"
+        cancelType="secondary"
+        onSubmit={() => {}}
+        submitText="Submit"
+        submitType="confirm"
+      />
+    )
+
+    const buttons = wrapper.find(Button)
+    assert.equal(buttons.length, 2)
+    assert.equal(buttons.at(0).props().type, 'secondary')
+    assert.equal(buttons.at(1).props().type, 'confirm')
+  })
+
+  it('should render a modal with children', () => {
+    const wrapper = shallow(
+      <Modal
+        onCancel={() => {}}
+        cancelText="Cancel"
+        onSubmit={() => {}}
+        submitText="Submit"
+      >
+        <div className="test-child" />
+      </Modal>
+    )
+
+    assert.ok(wrapper.find('.test-class'))
+  })
+
+  it('should render a modal with a header', () => {
+    const handleCancel = sinon.spy()
+    const handleSubmit = sinon.spy()
+    const wrapper = shallow(
+      <Modal
+        onCancel={handleCancel}
+        cancelText="Cancel"
+        onSubmit={handleSubmit}
+        submitText="Submit"
+        headerText="My Header"
+      />
+    )
+
+    assert.ok(wrapper.find('.modal-container__header'))
+    assert.equal(wrapper.find('.modal-container__header-text').text(), 'My Header')
+    assert.equal(handleCancel.callCount, 0)
+    assert.equal(handleSubmit.callCount, 0)
+    wrapper.find('.modal-container__header-close').simulate('click')
+    assert.equal(handleCancel.callCount, 1)
+    assert.equal(handleSubmit.callCount, 0)
+  })
+
+  it('should call onSubmit when onCancel is undefined and the header close button is clicked', () => {
+    const handleSubmit = sinon.spy()
+    const wrapper = shallow(
+      <Modal
+        onSubmit={handleSubmit}
+        submitText="Submit"
+        headerText="My Header"
+      />
+    )
+
+    assert.equal(handleSubmit.callCount, 0)
+    wrapper.find('.modal-container__header-close').simulate('click')
+    assert.equal(handleSubmit.callCount, 1)
+  })
+})
diff --git a/ui/app/components/modals/cancel-transaction/cancel-transaction-gas-fee/cancel-transaction-gas-fee.component.js b/ui/app/components/modals/cancel-transaction/cancel-transaction-gas-fee/cancel-transaction-gas-fee.component.js
index 56765698e..b082db1d0 100644
--- a/ui/app/components/modals/cancel-transaction/cancel-transaction-gas-fee/cancel-transaction-gas-fee.component.js
+++ b/ui/app/components/modals/cancel-transaction/cancel-transaction-gas-fee/cancel-transaction-gas-fee.component.js
@@ -1,21 +1,18 @@
 import React, { PureComponent } from 'react'
 import PropTypes from 'prop-types'
-import classnames from 'classnames'
 import CurrencyDisplay from '../../../currency-display'
 import { ETH } from '../../../../constants/common'
 
 export default class CancelTransaction extends PureComponent {
   static propTypes = {
-    className: PropTypes.string,
     value: PropTypes.string,
   }
 
   render () {
-    const { className, value } = this.props
-    console.log('VALUE', value)
+    const { value } = this.props
 
     return (
-      <div className={classnames('cancel-transaction-gas-fee', className)}>
+      <div className="cancel-transaction-gas-fee">
         <CurrencyDisplay
           className="cancel-transaction-gas-fee__eth"
           currency={ETH}
diff --git a/ui/app/components/modals/cancel-transaction/cancel-transaction-gas-fee/tests/cancel-transaction-gas-fee.component.test.js b/ui/app/components/modals/cancel-transaction/cancel-transaction-gas-fee/tests/cancel-transaction-gas-fee.component.test.js
new file mode 100644
index 000000000..994c2a577
--- /dev/null
+++ b/ui/app/components/modals/cancel-transaction/cancel-transaction-gas-fee/tests/cancel-transaction-gas-fee.component.test.js
@@ -0,0 +1,27 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow } from 'enzyme'
+import CancelTransactionGasFee from '../cancel-transaction-gas-fee.component'
+import CurrencyDisplay from '../../../../currency-display'
+
+describe('CancelTransactionGasFee Component', () => {
+  it('should render', () => {
+    const wrapper = shallow(
+      <CancelTransactionGasFee
+        value="0x3b9aca00"
+      />
+    )
+
+    assert.ok(wrapper)
+    assert.equal(wrapper.find(CurrencyDisplay).length, 2)
+    const ethDisplay = wrapper.find(CurrencyDisplay).at(0)
+    const fiatDisplay = wrapper.find(CurrencyDisplay).at(1)
+
+    assert.equal(ethDisplay.props().value, '0x3b9aca00')
+    assert.equal(ethDisplay.props().currency, 'ETH')
+    assert.equal(ethDisplay.props().className, 'cancel-transaction-gas-fee__eth')
+
+    assert.equal(fiatDisplay.props().value, '0x3b9aca00')
+    assert.equal(fiatDisplay.props().className, 'cancel-transaction-gas-fee__fiat')
+  })
+})
diff --git a/ui/app/components/modals/cancel-transaction/cancel-transaction.component.js b/ui/app/components/modals/cancel-transaction/cancel-transaction.component.js
index f5f0ea783..a30fbea96 100644
--- a/ui/app/components/modals/cancel-transaction/cancel-transaction.component.js
+++ b/ui/app/components/modals/cancel-transaction/cancel-transaction.component.js
@@ -57,10 +57,9 @@ export default class CancelTransaction extends PureComponent {
           <div className="cancel-transaction__title">
             { t('cancellationGasFee') }
           </div>
-          <CancelTransactionGasFee
-            className="cancel-transaction__cancel-transaction-gas-fee-container"
-            value={newGasFee}
-          />
+          <div className="cancel-transaction__cancel-transaction-gas-fee-container">
+            <CancelTransactionGasFee value={newGasFee} />
+          </div>
           <div className="cancel-transaction__description">
             { t('attemptToCancelDescription') }
           </div>
diff --git a/ui/app/components/modals/cancel-transaction/tests/cancel-transaction.component.test.js b/ui/app/components/modals/cancel-transaction/tests/cancel-transaction.component.test.js
new file mode 100644
index 000000000..053223467
--- /dev/null
+++ b/ui/app/components/modals/cancel-transaction/tests/cancel-transaction.component.test.js
@@ -0,0 +1,56 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow } from 'enzyme'
+import sinon from 'sinon'
+import CancelTransaction from '../cancel-transaction.component'
+import CancelTransactionGasFee from '../cancel-transaction-gas-fee'
+import Modal from '../../../modal'
+
+describe('CancelTransaction Component', () => {
+  const t = key => key
+
+  it('should render a CancelTransaction modal', () => {
+    const wrapper = shallow(
+      <CancelTransaction
+        defaultNewGasPrice="0x3b9aca00"
+      />,
+      { context: { t }}
+    )
+
+    assert.ok(wrapper)
+    assert.equal(wrapper.find(Modal).length, 1)
+    assert.equal(wrapper.find(CancelTransactionGasFee).length, 1)
+    assert.equal(wrapper.find(CancelTransactionGasFee).props().value, '0x1319718a5000')
+    assert.equal(wrapper.find('.cancel-transaction__title').text(), 'cancellationGasFee')
+    assert.equal(wrapper.find('.cancel-transaction__description').text(), 'attemptToCancelDescription')
+  })
+
+  it('should pass the correct props to the Modal component', async () => {
+    const createCancelTransactionSpy = sinon.stub().callsFake(() => Promise.resolve())
+    const hideModalSpy = sinon.spy()
+
+    const wrapper = shallow(
+      <CancelTransaction
+        defaultNewGasPrice="0x3b9aca00"
+        createCancelTransaction={createCancelTransactionSpy}
+        hideModal={hideModalSpy}
+      />,
+      { context: { t }}
+    )
+
+    assert.equal(wrapper.find(Modal).length, 1)
+    const modalProps = wrapper.find(Modal).props()
+
+    assert.equal(modalProps.headerText, 'attemptToCancel')
+    assert.equal(modalProps.submitText, 'yesLetsTry')
+    assert.equal(modalProps.cancelText, 'nevermind')
+
+    assert.equal(createCancelTransactionSpy.callCount, 0)
+    assert.equal(hideModalSpy.callCount, 0)
+    await modalProps.onSubmit()
+    assert.equal(createCancelTransactionSpy.callCount, 1)
+    assert.equal(hideModalSpy.callCount, 1)
+    modalProps.onCancel()
+    assert.equal(hideModalSpy.callCount, 2)
+  })
+})
diff --git a/ui/app/higher-order-components/with-modal-props/tests/with-modal-props.test.js b/ui/app/higher-order-components/with-modal-props/tests/with-modal-props.test.js
new file mode 100644
index 000000000..654e7062a
--- /dev/null
+++ b/ui/app/higher-order-components/with-modal-props/tests/with-modal-props.test.js
@@ -0,0 +1,43 @@
+
+import assert from 'assert'
+import configureMockStore from 'redux-mock-store'
+import { mount } from 'enzyme'
+import React from 'react'
+import withModalProps from '../with-modal-props'
+
+const mockState = {
+  appState: {
+    modal: {
+      modalState: {
+        props: {
+          prop1: 'prop1',
+          prop2: 2,
+          prop3: true,
+        },
+      },
+    },
+  },
+}
+
+describe('withModalProps', () => {
+  it('should return a component wrapped with modal state props', () => {
+    const TestComponent = props => (
+      <div className="test">Testing</div>
+    )
+    const WrappedComponent = withModalProps(TestComponent)
+    const store = configureMockStore()(mockState)
+    const wrapper = mount(
+      <WrappedComponent store={store} />
+    )
+
+    assert.ok(wrapper)
+    const testComponent = wrapper.find(TestComponent).at(0)
+    assert.equal(testComponent.length, 1)
+    assert.equal(testComponent.find('.test').text(), 'Testing')
+    const testComponentProps = testComponent.props()
+    assert.equal(testComponentProps.prop1, 'prop1')
+    assert.equal(testComponentProps.prop2, 2)
+    assert.equal(testComponentProps.prop3, true)
+    assert.equal(typeof testComponentProps.hideModal, 'function')
+  })
+})