diff --git a/currency.js b/currency.js
index 8a4abc515..377a34a2e 100644
--- a/currency.js
+++ b/currency.js
@@ -138,3 +138,4 @@ module.exports.BTCToLocalCurrency = BTCToLocalCurrency;
 module.exports.setPrefferedCurrency = setPrefferedCurrency;
 module.exports.getPreferredCurrency = getPreferredCurrency;
 module.exports.exchangeRates = exchangeRates; // export it to mock data in tests
+module.exports.preferredFiatCurrency = preferredFiatCurrency; // export it to mock data in tests
diff --git a/tests/integration/Currency.test.js b/tests/integration/Currency.test.js
index 5f42ba9d4..861af96c0 100644
--- a/tests/integration/Currency.test.js
+++ b/tests/integration/Currency.test.js
@@ -30,32 +30,4 @@ describe('currency', () => {
     cur = JSON.parse(await AsyncStorage.getItem(AppStorage.EXCHANGE_RATES));
     assert.ok(cur.BTC_EUR > 0);
   });
-
-  it('formats everything correctly', async () => {
-    const currency = require('../../currency');
-    await currency.setPrefferedCurrency(FiatUnit.USD);
-    await currency.startUpdater();
-    currency.exchangeRates.BTC_USD = 10000;
-    assert.strictEqual(currency.satoshiToLocalCurrency(1), '$0.0001');
-    assert.strictEqual(currency.satoshiToLocalCurrency(-1), '-$0.0001');
-    assert.strictEqual(currency.satoshiToLocalCurrency(123), '$0.012');
-    assert.strictEqual(currency.satoshiToLocalCurrency(146), '$0.015');
-    assert.strictEqual(currency.satoshiToLocalCurrency(123456789), '$12,345.68');
-
-    assert.strictEqual(currency.BTCToLocalCurrency(1), '$10,000.00');
-    assert.strictEqual(currency.BTCToLocalCurrency(-1), '-$10,000.00');
-    assert.strictEqual(currency.BTCToLocalCurrency(1.00000001), '$10,000.00');
-    assert.strictEqual(currency.BTCToLocalCurrency(1.0000123), '$10,000.12');
-    assert.strictEqual(currency.BTCToLocalCurrency(1.0000146), '$10,000.15');
-
-    assert.strictEqual(currency.satoshiToBTC(1), '0.00000001');
-    assert.strictEqual(currency.satoshiToBTC(-1), '-0.00000001');
-    assert.strictEqual(currency.satoshiToBTC(100000000), '1');
-    assert.strictEqual(currency.satoshiToBTC(123456789123456789), '1234567891.2345678');
-
-    await currency.setPrefferedCurrency(FiatUnit.JPY);
-    await currency.startUpdater();
-    currency.exchangeRates.BTC_JPY = 1043740.8614;
-    assert.strictEqual(currency.satoshiToLocalCurrency(1), '¥0.01');
-  });
 });
diff --git a/tests/unit/Currency.test.js b/tests/unit/Currency.test.js
new file mode 100644
index 000000000..983f39603
--- /dev/null
+++ b/tests/unit/Currency.test.js
@@ -0,0 +1,32 @@
+/* global describe, it */
+import { FiatUnit } from '../../models/fiatUnit';
+let assert = require('assert');
+
+describe('currency', () => {
+  it('formats everything correctly', async () => {
+    const currency = require('../../currency');
+    currency.exchangeRates.BTC_USD = 10000;
+    assert.strictEqual(currency.satoshiToLocalCurrency(1), '$0.0001');
+    assert.strictEqual(currency.satoshiToLocalCurrency(-1), '-$0.0001');
+    assert.strictEqual(currency.satoshiToLocalCurrency(123), '$0.012');
+    assert.strictEqual(currency.satoshiToLocalCurrency(146), '$0.015');
+    assert.strictEqual(currency.satoshiToLocalCurrency(123456789), '$12,345.68');
+
+    assert.strictEqual(currency.BTCToLocalCurrency(1), '$10,000.00');
+    assert.strictEqual(currency.BTCToLocalCurrency(-1), '-$10,000.00');
+    assert.strictEqual(currency.BTCToLocalCurrency(1.00000001), '$10,000.00');
+    assert.strictEqual(currency.BTCToLocalCurrency(1.0000123), '$10,000.12');
+    assert.strictEqual(currency.BTCToLocalCurrency(1.0000146), '$10,000.15');
+
+    assert.strictEqual(currency.satoshiToBTC(1), '0.00000001');
+    assert.strictEqual(currency.satoshiToBTC(-1), '-0.00000001');
+    assert.strictEqual(currency.satoshiToBTC(100000000), '1');
+    assert.strictEqual(currency.satoshiToBTC(123456789123456789), '1234567891.2345678');
+
+    currency.preferredFiatCurrency.endPointKey = FiatUnit.JPY.endPointKey;
+    currency.preferredFiatCurrency.symbol = FiatUnit.JPY.symbol;
+    currency.preferredFiatCurrency.locale = FiatUnit.JPY.locale;
+    currency.exchangeRates.BTC_JPY = 1043740.8614;
+    assert.strictEqual(currency.satoshiToLocalCurrency(1), '¥0.01');
+  });
+});