fix: EUROC to EURC renaming on Coinbase (#254)

src/exchange_adapters/coinbase.ts

@@ -1,5 +1,5 @@
 import { BaseExchangeAdapter, ExchangeAdapter, ExchangeDataType, Ticker } from './base'
-import { Currency, Exchange } from '../utils'
+import { Currency, Exchange, ExternalCurrency } from '../utils'
 
 import { CeloContract } from '@celo/contractkit'
 
@@ -12,12 +12,12 @@ export class CoinbaseAdapter extends BaseExchangeAdapter implements ExchangeAdap
   readonly _exchangeName = Exchange.COINBASE
 
   /**
-   * Coinbase is currently using `CGLD` as the symbol for CELO. This is likely
-   * to be changed at some point after listing.
+   * Coinbase is currently using `CGLD` as the symbol for CELO and `EURC` as the symbol for EUROC.
    */
   private static readonly tokenSymbolMap = new Map<Currency, string>([
     ...CoinbaseAdapter.standardTokenSymbolMap,
     [CeloContract.GoldToken, 'CGLD'],
+    [ExternalCurrency.EUROC, 'EURC'],
   ])
 
   protected generatePairSymbol(): string {

test/exchange_adapters/coinbase.test.ts

@@ -65,6 +65,29 @@ describe('CoinbaseAdapter', () => {
     })
   })
 
+  describe('using the non-standard symbol for EUROC', () => {
+    let coinbaseAdapter2: CoinbaseAdapter
+    const config2: ExchangeAdapterConfig = {
+      baseCurrency: ExternalCurrency.EUROC,
+      baseLogger,
+      quoteCurrency: ExternalCurrency.USD,
+    }
+
+    let fetchFromApiSpy: jest.SpyInstance
+    beforeEach(() => {
+      coinbaseAdapter2 = new CoinbaseAdapter(config2)
+      fetchFromApiSpy = jest.spyOn(coinbaseAdapter2, 'fetchFromApi')
+    })
+    it('uses the right symbols when fetching the ticker', async () => {
+      fetchFromApiSpy.mockReturnValue(Promise.resolve(mockTickerJson))
+      await coinbaseAdapter2.fetchTicker()
+      expect(fetchFromApiSpy).toHaveBeenCalledWith(
+        ExchangeDataType.TICKER,
+        'products/EURC-USD/ticker'
+      )
+    })
+  })
+
   describe('parseTicker', () => {
     it('handles a response that matches the documentation', () => {
       const ticker = coinbaseAdapter.parseTicker(mockTickerJson)