Set fixed btc unit in unit tests

Author: tanx

test/unit/action/channel.spec.js

@@ -21,6 +21,7 @@ describe('Action Channels Unit Tests', () => {
     sandbox = sinon.createSandbox({});
     sandbox.stub(logger);
     store = new Store();
+    store.settings.unit = 'btc';
     store.settings.displayFiat = false;
     require('../../../src/config').RETRY_DELAY = 1;
     grpc = sinon.createStubInstance(GrpcAction);

test/unit/action/invoice.spec.js

@@ -14,6 +14,7 @@ describe('Action Invoice Unit Tests', () => {
 
   beforeEach(() => {
     store = new Store();
+    store.settings.unit = 'btc';
     store.settings.displayFiat = false;
     require('../../../src/config').RETRY_DELAY = 1;
     nav = sinon.createStubInstance(NavAction);

test/unit/action/payment.spec.js

@@ -21,6 +21,7 @@ describe('Action Payments Unit Tests', () => {
     sandbox = sinon.createSandbox({});
     sandbox.stub(logger);
     store = new Store();
+    store.settings.unit = 'btc';
     store.settings.displayFiat = false;
     require('../../../src/config').RETRY_DELAY = 1;
     require('../../../src/config').PAYMENT_TIMEOUT = 1;

test/unit/computed/channel.spec.js

@@ -6,6 +6,7 @@ describe('Computed Channels Unit Tests', () => {
 
   beforeEach(() => {
     store = new Store();
+    store.settings.unit = 'btc';
     store.settings.displayFiat = false;
     store.channels.push({
       remotePubkey: 'some-pub-key',

test/unit/computed/invoice.spec.js

@@ -6,6 +6,7 @@ describe('Computed Invoice Unit Tests', () => {
 
   beforeEach(() => {
     store = new Store();
+    store.settings.unit = 'btc';
     store.settings.displayFiat = false;
   });
 

test/unit/computed/payment.spec.js

@@ -6,6 +6,7 @@ describe('Computed Payment Unit Tests', () => {
 
   beforeEach(() => {
     store = new Store();
+    store.settings.unit = 'btc';
     store.settings.displayFiat = false;
   });
 

test/unit/computed/transaction.spec.js

@@ -15,6 +15,7 @@ describe('Computed Transactions Unit Tests', () => {
 
   beforeEach(() => {
     store = new Store();
+    store.settings.unit = 'btc';
     store.transactions.push(bitcoinTransaction);
     store.payments.push({
       id: '1',