Fix bug resolving promises

When a explicit argument is passed for `--icon` or `--user-agent`, the
promise chain will fail because we do not return a resolved promise.

package.json

@@ -75,7 +75,7 @@
     "gulp-mocha": "^4.3.0",
     "gulp-sourcemaps": "^2.6.0",
     "isparta": "^4.0.0",
-    "jest": "^19.0.2",
+    "jest": "^20.0.3",
     "regenerator-runtime": "^0.10.5",
     "require-dir": "^0.3.0",
     "run-sequence": "^1.1.5",
@@ -90,6 +90,8 @@
     ]
   },
   "jest": {
-    "testMatch": ["**/src/**/?(*.)(spec|test).js?(x)"]
+    "testMatch": [
+      "**/src/**/?(*.)(spec|test).js?(x)"
+    ]
   }
 }

src/options/fields/icon.js

@@ -4,7 +4,7 @@ import { inferIcon } from './../../infer';
 export default function ({ icon, targetUrl, platform }) {
   // Icon is the path to the icon
   if (icon) {
-    return icon;
+    return Promise.resolve(icon);
   }
 
   return inferIcon(targetUrl, platform)

src/options/fields/icon.test.js

@@ -12,7 +12,7 @@ describe('when the icon parameter is passed', () => {
     expect(inferIcon).toHaveBeenCalledTimes(0);
 
     const params = { icon: './icon.png' };
-    expect(icon(params)).toBe(params.icon);
+    expect(icon(params)).resolves.toBe(params.icon);
   });
 });
 

src/options/fields/userAgent.js

@@ -2,7 +2,7 @@ import { inferUserAgent } from './../../infer';
 
 export default function ({ userAgent, electronVersion, platform }) {
   if (userAgent) {
-    return userAgent;
+    return Promise.resolve(userAgent);
   }
 
   return inferUserAgent(electronVersion, platform);

src/options/fields/userAgent.test.js

@@ -7,7 +7,7 @@ test('when a userAgent parameter is passed', () => {
   expect(inferUserAgent).toHaveBeenCalledTimes(0);
 
   const params = { userAgent: 'valid user agent' };
-  expect(userAgent(params)).toBe(params.userAgent);
+  expect(userAgent(params)).resolves.toBe(params.userAgent);
 });
 
 test('no userAgent parameter is passed', () => {