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diff --git a/ui/app/components/currency-input/tests/currency-input.component.test.js b/ui/app/components/currency-input/tests/currency-input.component.test.js
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+++ b/ui/app/components/currency-input/tests/currency-input.component.test.js
@@ -0,0 +1,251 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow, mount } from 'enzyme'
+import sinon from 'sinon'
+import { Provider } from 'react-redux'
+import configureMockStore from 'redux-mock-store'
+import CurrencyInput from '../currency-input.component'
+import UnitInput from '../../unit-input'
+import CurrencyDisplay from '../../currency-display'
+
+describe('CurrencyInput Component', () => {
+ describe('rendering', () => {
+ it('should render properly without a suffix', () => {
+ const wrapper = shallow(
+ <CurrencyInput />
+ )
+
+ assert.ok(wrapper)
+ assert.equal(wrapper.find(UnitInput).length, 1)
+ })
+
+ it('should render properly with a suffix', () => {
+ const mockStore = {
+ metamask: {
+ nativeCurrency: 'ETH',
+ currentCurrency: 'usd',
+ conversionRate: 231.06,
+ },
+ }
+ const store = configureMockStore()(mockStore)
+
+ const wrapper = mount(
+ <Provider store={store}>
+ <CurrencyInput
+ suffix="ETH"
+ nativeCurrency="ETH"
+ />
+ </Provider>
+ )
+
+ assert.ok(wrapper)
+ assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+ assert.equal(wrapper.find('.unit-input__suffix').text(), 'ETH')
+ assert.equal(wrapper.find(CurrencyDisplay).length, 1)
+ })
+
+ it('should render properly with an ETH value', () => {
+ const mockStore = {
+ metamask: {
+ nativeCurrency: 'ETH',
+ currentCurrency: 'usd',
+ conversionRate: 231.06,
+ },
+ }
+ const store = configureMockStore()(mockStore)
+
+ const wrapper = mount(
+ <Provider store={store}>
+ <CurrencyInput
+ value="de0b6b3a7640000"
+ suffix="ETH"
+ nativeCurrency="ETH"
+ currentCurrency="usd"
+ conversionRate={231.06}
+ />
+ </Provider>
+ )
+
+ assert.ok(wrapper)
+ const currencyInputInstance = wrapper.find(CurrencyInput).at(0).instance()
+ assert.equal(currencyInputInstance.state.decimalValue, 1)
+ assert.equal(currencyInputInstance.state.hexValue, 'de0b6b3a7640000')
+ assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+ assert.equal(wrapper.find('.unit-input__suffix').text(), 'ETH')
+ assert.equal(wrapper.find('.unit-input__input').props().value, '1')
+ assert.equal(wrapper.find('.currency-display-component').text(), '$231.06USD')
+ })
+
+ it('should render properly with a fiat value', () => {
+ const mockStore = {
+ metamask: {
+ nativeCurrency: 'ETH',
+ currentCurrency: 'usd',
+ conversionRate: 231.06,
+ },
+ }
+ const store = configureMockStore()(mockStore)
+
+ const wrapper = mount(
+ <Provider store={store}>
+ <CurrencyInput
+ value="f602f2234d0ea"
+ suffix="USD"
+ useFiat
+ nativeCurrency="ETH"
+ currentCurrency="usd"
+ conversionRate={231.06}
+ />
+ </Provider>
+ )
+
+ assert.ok(wrapper)
+ const currencyInputInstance = wrapper.find(CurrencyInput).at(0).instance()
+ assert.equal(currencyInputInstance.state.decimalValue, 1)
+ assert.equal(currencyInputInstance.state.hexValue, 'f602f2234d0ea')
+ assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+ assert.equal(wrapper.find('.unit-input__suffix').text(), 'USD')
+ assert.equal(wrapper.find('.unit-input__input').props().value, '1')
+ assert.equal(wrapper.find('.currency-display-component').text(), '0.004328ETH')
+ })
+ })
+
+ describe('handling actions', () => {
+ const handleChangeSpy = sinon.spy()
+ const handleBlurSpy = sinon.spy()
+
+ afterEach(() => {
+ handleChangeSpy.resetHistory()
+ handleBlurSpy.resetHistory()
+ })
+
+ it('should call onChange and onBlur on input changes with the hex value for ETH', () => {
+ const mockStore = {
+ metamask: {
+ nativeCurrency: 'ETH',
+ currentCurrency: 'usd',
+ conversionRate: 231.06,
+ },
+ }
+ const store = configureMockStore()(mockStore)
+ const wrapper = mount(
+ <Provider store={store}>
+ <CurrencyInput
+ onChange={handleChangeSpy}
+ onBlur={handleBlurSpy}
+ suffix="ETH"
+ nativeCurrency="ETH"
+ currentCurrency="usd"
+ conversionRate={231.06}
+ />
+ </Provider>
+ )
+
+ assert.ok(wrapper)
+ assert.equal(handleChangeSpy.callCount, 0)
+ assert.equal(handleBlurSpy.callCount, 0)
+
+ const currencyInputInstance = wrapper.find(CurrencyInput).at(0).instance()
+ assert.equal(currencyInputInstance.state.decimalValue, 0)
+ assert.equal(currencyInputInstance.state.hexValue, undefined)
+ assert.equal(wrapper.find('.currency-display-component').text(), '$0.00USD')
+ const input = wrapper.find('input')
+ assert.equal(input.props().value, 0)
+
+ input.simulate('change', { target: { value: 1 } })
+ assert.equal(handleChangeSpy.callCount, 1)
+ assert.ok(handleChangeSpy.calledWith('de0b6b3a7640000'))
+ assert.equal(wrapper.find('.currency-display-component').text(), '$231.06USD')
+ assert.equal(currencyInputInstance.state.decimalValue, 1)
+ assert.equal(currencyInputInstance.state.hexValue, 'de0b6b3a7640000')
+
+ assert.equal(handleBlurSpy.callCount, 0)
+ input.simulate('blur')
+ assert.equal(handleBlurSpy.callCount, 1)
+ assert.ok(handleBlurSpy.calledWith('de0b6b3a7640000'))
+ })
+
+ it('should call onChange and onBlur on input changes with the hex value for fiat', () => {
+ const mockStore = {
+ metamask: {
+ nativeCurrency: 'ETH',
+ currentCurrency: 'usd',
+ conversionRate: 231.06,
+ },
+ }
+ const store = configureMockStore()(mockStore)
+ const wrapper = mount(
+ <Provider store={store}>
+ <CurrencyInput
+ onChange={handleChangeSpy}
+ onBlur={handleBlurSpy}
+ suffix="USD"
+ nativeCurrency="ETH"
+ currentCurrency="usd"
+ conversionRate={231.06}
+ useFiat
+ />
+ </Provider>
+ )
+
+ assert.ok(wrapper)
+ assert.equal(handleChangeSpy.callCount, 0)
+ assert.equal(handleBlurSpy.callCount, 0)
+
+ const currencyInputInstance = wrapper.find(CurrencyInput).at(0).instance()
+ assert.equal(currencyInputInstance.state.decimalValue, 0)
+ assert.equal(currencyInputInstance.state.hexValue, undefined)
+ assert.equal(wrapper.find('.currency-display-component').text(), '0ETH')
+ const input = wrapper.find('input')
+ assert.equal(input.props().value, 0)
+
+ input.simulate('change', { target: { value: 1 } })
+ assert.equal(handleChangeSpy.callCount, 1)
+ assert.ok(handleChangeSpy.calledWith('f602f2234d0ea'))
+ assert.equal(wrapper.find('.currency-display-component').text(), '0.004328ETH')
+ assert.equal(currencyInputInstance.state.decimalValue, 1)
+ assert.equal(currencyInputInstance.state.hexValue, 'f602f2234d0ea')
+
+ assert.equal(handleBlurSpy.callCount, 0)
+ input.simulate('blur')
+ assert.equal(handleBlurSpy.callCount, 1)
+ assert.ok(handleBlurSpy.calledWith('f602f2234d0ea'))
+ })
+
+ it('should change the state and pass in a new decimalValue when props.value changes', () => {
+ const mockStore = {
+ metamask: {
+ nativeCurrency: 'ETH',
+ currentCurrency: 'usd',
+ conversionRate: 231.06,
+ },
+ }
+ const store = configureMockStore()(mockStore)
+ const wrapper = shallow(
+ <Provider store={store}>
+ <CurrencyInput
+ onChange={handleChangeSpy}
+ onBlur={handleBlurSpy}
+ suffix="USD"
+ nativeCurrency="ETH"
+ currentCurrency="usd"
+ conversionRate={231.06}
+ useFiat
+ />
+ </Provider>
+ )
+
+ assert.ok(wrapper)
+ const currencyInputInstance = wrapper.find(CurrencyInput).dive()
+ assert.equal(currencyInputInstance.state('decimalValue'), 0)
+ assert.equal(currencyInputInstance.state('hexValue'), undefined)
+ assert.equal(currencyInputInstance.find(UnitInput).props().value, 0)
+
+ currencyInputInstance.setProps({ value: '1ec05e43e72400' })
+ currencyInputInstance.update()
+ assert.equal(currencyInputInstance.state('decimalValue'), 2)
+ assert.equal(currencyInputInstance.state('hexValue'), '1ec05e43e72400')
+ assert.equal(currencyInputInstance.find(UnitInput).props().value, 2)
+ })
+ })
+})