Convert lastModified date to GMT string per spec (#275)

Author: notlmn

source/lib/api.js

@@ -126,7 +126,7 @@ export async function getNotificationCount() {
 	const {headers, json: notifications} = await getNotificationResponse({maxItems: 1});
 
 	const interval = Number(headers.get('X-Poll-Interval'));
-	const lastModified = (new Date(headers.get('Last-Modified'))).toISOString();
+	const lastModified = (new Date(headers.get('Last-Modified'))).toGMTString();
 	const linkHeader = headers.get('Link');
 
 	if (linkHeader === null) {

source/lib/notifications-service.js

@@ -125,7 +125,7 @@ export function playNotificationSound() {
 }
 
 export async function checkNotifications(lastModified) {
-	let notifications = await getNotifications({lastModified});
+	let notifications = await getNotifications({lastModified: lastModified.toGMTString()});
 	const {showDesktopNotif, playNotifSound, filterNotifications} = await optionsStorage.getAll();
 
 	if (filterNotifications) {

test/api-test.js

@@ -154,7 +154,7 @@ test.serial('#getNotificationCount promise resolves response of 0 notifications
 	global.fetch = fakeFetch();
 
 	const response = await service.getNotificationCount();
-	t.deepEqual(response, {count: 0, interval: 60, lastModified: '1970-01-01T00:00:00.000Z'});
+	t.deepEqual(response, {count: 0, interval: 60, lastModified: 'Thu, 01 Jan 1970 00:00:00 GMT'});
 });
 
 test.serial('#getNotificationCount promise resolves response of N notifications according to Link header', async t => {
@@ -168,7 +168,7 @@ test.serial('#getNotificationCount promise resolves response of N notifications
 		}
 	});
 
-	t.deepEqual(await service.getNotificationCount(), {count: 2, interval: 60, lastModified: '1970-01-01T00:00:00.000Z'});
+	t.deepEqual(await service.getNotificationCount(), {count: 2, interval: 60, lastModified: 'Thu, 01 Jan 1970 00:00:00 GMT'});
 
 	global.fetch = fakeFetch({
 		headers: {
@@ -179,7 +179,7 @@ test.serial('#getNotificationCount promise resolves response of N notifications
 		}
 	});
 
-	t.deepEqual(await service.getNotificationCount(), {count: 3, interval: 60, lastModified: '1970-01-01T00:00:00.000Z'});
+	t.deepEqual(await service.getNotificationCount(), {count: 3, interval: 60, lastModified: 'Thu, 01 Jan 1970 00:00:00 GMT'});
 });
 
 test.serial('#makeApiRequest returns rejected promise for 4xx status codes', async t => {