metamask-extension/ui/app/helpers/utils/conversion-util.test.js

import assert from 'assert'
import BigNumber from 'bignumber.js'
import { addCurrencies, conversionUtil } from './conversion-util'

describe('conversion utils', function () {
  describe('addCurrencies()', function () {
    it('add whole numbers', function () {
      const result = addCurrencies(3, 9)
      assert.equal(result.toNumber(), 12)
    })

    it('add decimals', function () {
      const result = addCurrencies(1.3, 1.9)
      assert.equal(result.toNumber(), 3.2)
    })

    it('add repeating decimals', function () {
      const result = addCurrencies(1 / 3, 1 / 9)
      assert.equal(result.toNumber(), 0.4444444444444444)
    })
  })

  describe('conversionUtil', function () {
    it('Returns expected types', function () {
      const conv1 = conversionUtil(1000000000000000000, {
        fromNumericBase: 'dec',
        toNumericBase: 'hex',
      })
      const conv2 = conversionUtil(1, {
        fromNumericBase: 'dec',
        fromDenomination: 'ETH',
        toDenomination: 'WEI',
      })
      assert(
        typeof conv1 === 'string',
        'conversion 1 should return type string',
      )
      assert(conv2 instanceof BigNumber, 'conversion 2 should be a BigNumber')
    })
    it('Converts from dec to hex', function () {
      assert.equal(
        conversionUtil('1000000000000000000', {
          fromNumericBase: 'dec',
          toNumericBase: 'hex',
        }),
        'de0b6b3a7640000',
      )
      assert.equal(
        conversionUtil('1500000000000000000', {
          fromNumericBase: 'dec',
          toNumericBase: 'hex',
        }),
        '14d1120d7b160000',
      )
    })
    it('Converts hex formatted numbers to dec', function () {
      assert.equal(
        conversionUtil('0xde0b6b3a7640000', {
          fromNumericBase: 'hex',
          toNumericBase: 'dec',
        }),
        1000000000000000000,
      )
      assert.equal(
        conversionUtil('0x14d1120d7b160000', {
          fromNumericBase: 'hex',
          toNumericBase: 'dec',
        }),
        1500000000000000000,
      )
    })
    it('Converts WEI to ETH', function () {
      assert.equal(
        conversionUtil('0xde0b6b3a7640000', {
          fromNumericBase: 'hex',
          toNumericBase: 'dec',
          fromDenomination: 'WEI',
          toDenomination: 'ETH',
        }),
        1,
      )
      assert.equal(
        conversionUtil('0x14d1120d7b160000', {
          fromNumericBase: 'hex',
          toNumericBase: 'dec',
          fromDenomination: 'WEI',
          toDenomination: 'ETH',
        }),
        1.5,
      )
    })
    it('Converts ETH to WEI', function () {
      assert.equal(
        conversionUtil('1', {
          fromNumericBase: 'dec',
          fromDenomination: 'ETH',
          toDenomination: 'WEI',
        }),
        1000000000000000000,
      )
      assert.equal(
        conversionUtil('1.5', {
          fromNumericBase: 'dec',
          fromDenomination: 'ETH',
          toDenomination: 'WEI',
        }),
        1500000000000000000,
      )
    })
    it('Converts ETH to GWEI', function () {
      assert.equal(
        conversionUtil('1', {
          fromNumericBase: 'dec',
          fromDenomination: 'ETH',
          toDenomination: 'GWEI',
        }),
        1000000000,
      )
      assert.equal(
        conversionUtil('1.5', {
          fromNumericBase: 'dec',
          fromDenomination: 'ETH',
          toDenomination: 'GWEI',
        }),
        1500000000,
      )
    })
    it('Converts ETH to USD', function () {
      assert.equal(
        conversionUtil('1', {
          fromNumericBase: 'dec',
          toNumericBase: 'dec',
          toCurrency: 'usd',
          conversionRate: 468.58,
          numberOfDecimals: 2,
        }),
        468.58,
      )
      assert.equal(
        conversionUtil('1.5', {
          fromNumericBase: 'dec',
          toNumericBase: 'dec',
          toCurrency: 'usd',
          conversionRate: 468.58,
          numberOfDecimals: 2,
        }),
        702.87,
      )
    })
    it('Converts USD to ETH', function () {
      assert.equal(
        conversionUtil('468.58', {
          fromNumericBase: 'dec',
          toNumericBase: 'dec',
          toCurrency: 'usd',
          conversionRate: 468.58,
          numberOfDecimals: 2,
          invertConversionRate: true,
        }),
        1,
      )
      assert.equal(
        conversionUtil('702.87', {
          fromNumericBase: 'dec',
          toNumericBase: 'dec',
          toCurrency: 'usd',
          conversionRate: 468.58,
          numberOfDecimals: 2,
          invertConversionRate: true,
        }),
        1.5,
      )
    })
  })
})