Maintain token prices using a background service

1 files changed, 28 insertions, 0 deletions

diff --git a/test/unit/token-rates-controller.js b/test/unit/token-rates-controller.js
new file mode 100644
index 000000000..55bfe7823
--- /dev/null
+++ b/test/unit/token-rates-controller.js
@@ -0,0 +1,28 @@
+const assert = require('assert')
+const sinon = require('sinon')
+const TokenRatesController = require('../../app/scripts/controllers/token-rates')
+const ObservableStore = require('obs-store')
+
+describe('TokenRatesController', () => {
+  it('should listen for preferences store updates', () => {
+    const preferences = new ObservableStore({ tokens: [] })
+    const controller = new TokenRatesController({ preferences })
+    preferences.putState({ tokens: ['foo'] })
+    assert.deepEqual(controller._tokens, ['foo'])
+  })
+
+  it('should poll on correct interval', async () => {
+    const stub = sinon.stub(global, 'setInterval')
+    new TokenRatesController({ interval: 1337 }) // eslint-disable-line no-new
+    assert.strictEqual(stub.getCall(0).args[1], 1337)
+    stub.restore()
+  })
+
+  it('should fetch each token rate based on address', async () => {
+    const controller = new TokenRatesController()
+    controller.fetchExchangeRate = address => address
+    controller.tokens = [{ address: 'foo' }, { address: 'bar' }]
+    await controller.updateExchangeRates()
+    assert.deepEqual(controller.store.getState().contractExchangeRates, { foo: 'foo', bar: 'bar' })
+  })
+})