test CurrencyIcon component

test/components/CurrencyIcon.spec.js

@@ -0,0 +1,29 @@
+import React from 'react'
+import { shallow } from 'enzyme'
+import { FaDollar } from 'react-icons/lib/fa'
+import CryptoIcon from '../../app/components/CryptoIcon'
+import CurrencyIcon from '../../app/components/CurrencyIcon'
+
+const defaultProps = {
+  currency: '',
+  crypto: '',
+  styles: {}
+}
+
+describe('component.CurrencyIcon', () => {
+  describe('currency is "usd"', () => {
+    const props = { ...defaultProps, currency: 'usd' }
+    const el = shallow(<CurrencyIcon {...props} />)
+    it('should show usd symbo', () => {
+      expect(el.find(FaDollar)).toHaveLength(1)
+    })
+  })
+
+  describe('currency is not "usd"', () => {
+    const props = { ...defaultProps, currency: 'btc' }
+    const el = shallow(<CurrencyIcon {...props} />)
+    it('should show btc symbol', () => {
+      expect(el.find(CryptoIcon)).toHaveLength(1)
+    })
+  })
+})