Fix less than cent case to small sat amounts

Author: tanx

src/action/payment.js

@@ -137,10 +137,10 @@ class PaymentAction {
       return this.setAmount({ amount: '0' });
     }
     let amtSat = Math.floor(0.8 * balanceSatoshis);
-    payment.amount = toAmount(amtSat, settings);
+    payment.amount = toAmount(amtSat, settings, 2);
     await this.estimateFee();
     amtSat = balanceSatoshis - toSatoshis(payment.fee, settings);
-    payment.amount = toAmount(amtSat, settings);
+    payment.amount = toAmount(amtSat, settings, 2);
     payment.sendAll = true;
   }
 

src/helper.js

@@ -81,7 +81,7 @@ export const toSatoshis = (amount, settings) => {
  * @param  {Object} settings Contains the current exchange rate
  * @return {string}          The amount formatted as '0.0001'
  */
-export const toAmount = (satoshis, settings) => {
+export const toAmount = (satoshis, settings, fiatPrecision = 8) => {
   if (
     !Number.isInteger(satoshis) ||
     !settings ||
@@ -95,7 +95,7 @@ export const toAmount = (satoshis, settings) => {
   const options = {
     useGrouping: false,
     minimumFractionDigits: settings.displayFiat ? 2 : 0,
-    maximumFractionDigits: settings.displayFiat ? 2 : 8,
+    maximumFractionDigits: settings.displayFiat ? fiatPrecision : 8,
   };
   return new Intl.NumberFormat('en-US', options).format(num);
 };

test/unit/helper.spec.js

@@ -363,13 +363,19 @@ describe('Helpers Unit Tests', () => {
     it('should work for number input (fiat)', () => {
       settings.displayFiat = true;
       const num = helpers.toAmount(100000, settings);
+      expect(num, 'to equal', '6.89512515');
+    });
+
+    it('should work for number input (fiat)', () => {
+      settings.displayFiat = true;
+      const num = helpers.toAmount(100000, settings, 2);
       expect(num, 'to equal', '6.90');
     });
 
     it('should use period for decimals values (fiat)', () => {
       settings.displayFiat = true;
       const num = helpers.toAmount(100000000, settings);
-      expect(num, 'to equal', '6895.13');
+      expect(num, 'to equal', '6895.12514652');
     });
 
     it('should work for 0 (fiat)', () => {
@@ -381,13 +387,13 @@ describe('Helpers Unit Tests', () => {
     it('should work for 1 (fiat)', () => {
       settings.displayFiat = true;
       const num = helpers.toAmount(1, settings);
-      expect(num, 'to equal', '0.00');
+      expect(num, 'to equal', '0.00006895');
     });
 
     it('should work for 1000 (fiat)', () => {
       settings.displayFiat = true;
       const num = helpers.toAmount(1000, settings);
-      expect(num, 'to equal', '0.07');
+      expect(num, 'to equal', '0.06895125');
     });
   });