fix(maker): allow comma seperated arches in make as well as package

ISSUES CLOSED: #227

src/api/make.js

@@ -112,7 +112,7 @@ export default async (providedOptions = {}) => {
 
   info(interactive, 'Making for the following targets:', `${targets.join(', ')}`.cyan);
 
-  let targetArchs = [declaredArch];
+  let targetArchs = declaredArch.split(',');
   if (declaredArch === 'all') {
     switch (platform) {
       case 'darwin':

test/slow/api_spec_slow.js

@@ -270,7 +270,7 @@ describe(`electron-forge API (with installer=${installer.substr(12)})`, () => {
         testMakeTarget(maker, false, targetOptionFetcher);
       }
 
-      describe('make', async () => {
+      describe('make', () => {
         it('throws an error when given an unrecognized platform', async () => {
           await expect(forge.make({ dir, platform: 'dos' })).to.eventually.be.rejectedWith(/invalid platform/);
         });
@@ -292,6 +292,14 @@ describe(`electron-forge API (with installer=${installer.substr(12)})`, () => {
             skipPackage: true,
           })).to.eventually.be.rejectedWith(/incompatible with this version/);
         });
+
+        it('should succeed when provided comma seperated arches', async () => {
+          // Darwin only has x64 so we can't do this test on that platform
+          await forge.make({
+            dir,
+            arch: process.platform === 'darwin' ? 'x64' : 'ia32,x64',
+          });
+        });
       });
     });