Support itbit exchange/ticker. Additions (#232)

* Initial itBit implementation

* Add tests for calculatePrice in exchange/itbit.js

* Add etherium to supported crypto codes in common/itbit.js

* Apply standardjs to itbit files

* itbit trade test. not important

* test getCurrencyRates in ticker/itbit.js

test/unit/itbit-calculate-price.js

@@ -0,0 +1,78 @@
+import test from 'ava'
+import rewire from 'rewire'
+
+function rewireCalculatePrice (commonMock) {
+  const itbit = rewire('../../lib/plugins/exchange/itbit/itbit')
+
+  itbit.__set__('common', commonMock)
+
+  const calculatePrice = itbit.__get__('calculatePrice')
+
+  return calculatePrice
+}
+
+test('calculate minimum available price for buy', async t => {
+  const commonMock = {
+    request () {
+      return Promise.resolve({
+        asks: [
+          [2, 10],
+          [4, 15],
+          [4.5, 17]
+        ],
+        bids: []
+      })
+    }
+  }
+
+  const calculatePrice = rewireCalculatePrice(commonMock)
+
+  let price = await calculatePrice('buy', 'XBTUSD', 20)
+
+  t.is(price, 4)
+})
+
+test('calculate minimum available price for sell', async t => {
+  const commonMock = {
+    request () {
+      return Promise.resolve({
+        bids: [
+          [2, 10],
+          [3, 15],
+          [4.5, 17]
+        ],
+        asks: []
+      })
+    }
+  }
+
+  const calculatePrice = rewireCalculatePrice(commonMock)
+
+  let price = await calculatePrice('sell', 'XBTUSD', 20)
+
+  t.is(price, 3)
+})
+
+test('throw error on insufficient trade depth', async t => {
+  t.plan(1)
+
+  const commonMock = {
+    request () {
+      return Promise.resolve({
+        asks: [
+          [2, 10],
+          [4, 15],
+          [4.5, 17]
+        ],
+        bids: []
+      })
+    }
+  }
+
+  const calculatePrice = rewireCalculatePrice(commonMock)
+
+  calculatePrice('buy', 'XBTUSD', 100)
+    .catch(err => {
+      t.is(err.message, 'Insufficient market depth')
+    })
+})

test/unit/itbit-get-currency-rates.js

@@ -0,0 +1,48 @@
+import test from 'ava'
+import rewire from 'rewire'
+import BN from '../../lib/bn'
+
+function rewireGetCurrencyRates (commonMock) {
+  const itbit = rewire('../../lib/plugins/ticker/itbit/itbit')
+
+  itbit.__set__('common', commonMock)
+
+  const getCurrencyRates = itbit.__get__('getCurrencyRates')
+
+  return getCurrencyRates
+}
+
+test('get currency rates of BTC USD', async t => {
+  function mockRequest() {
+    return Promise.resolve({
+      pair: 'XBTUSD',
+      bid: '622',
+      bidAmt: '0.0006',
+      ask: '641.29',
+      askAmt: '0.5',
+      lastPrice: '618.00000000',
+      lastAmt: '0.00040000',
+      volume24h: '0.00040000',
+      volumeToday: '0.00040000',
+      high24h: '618.00000000',
+      low24h: '618.00000000',
+      highToday: '618.00000000',
+      lowToday: '618.00000000',
+      openToday: '618.00000000',
+      vwapToday: '618.00000000',
+      vwap24h: '618.00000000',
+      serverTimeUTC: '2014-06-24T20:42:35.6160000Z'
+    })
+  }
+  
+  const common = rewire('../../lib/plugins/common/itbit')
+  
+  common.request = mockRequest
+
+  const getCurrencyRates = rewireGetCurrencyRates(common)
+
+  let result = await getCurrencyRates('USD', 'BTC')
+
+  t.true(result.rates.bid.eq('622'))
+  t.true(result.rates.ask.eq('641.29'))
+})

test/unit/itbit-trade.js

@@ -0,0 +1,35 @@
+import test from 'ava'
+import rewire from 'rewire'
+import BN from '../../lib/bn'
+
+function rewireTrade (commonMock, calculatePrice = () => Promise.resolve(15)) {
+  const itbit = rewire('../../lib/plugins/exchange/itbit/itbit')
+
+  itbit.__set__('common', commonMock)
+  itbit.__set__('calculatePrice', calculatePrice)
+
+  const trade = itbit.__get__('trade')
+
+  return trade
+}
+
+test('should handle itbit error response', async t => {
+  t.plan(1)
+
+  const commonMock = {
+    mock: true,
+    authRequest () {
+      return Promise.reject(new Error('The wallet provided does not have the funds required to place the order.'))
+    },
+    buildMarket () {
+      return 'XBTUSD'
+    }
+  }
+
+  const trade = rewireTrade(commonMock)
+
+  trade('buy', { walletId: 'id' }, BN('93410'), 'USD', 'BTC')
+    .catch(err => {
+      t.regex(err.message, /wallet provided/g)
+    })
+})