Added TimeZone.browser() and improved coverage

package.json

@@ -1,6 +1,6 @@
 {
   "name": "globol",
-  "version": "0.6.0",
+  "version": "0.7.0",
   "description": "Javascript/Typescript date/time as it should be: immutable, fluent, multi-zone, intuitive. Inspired by the masterful java.time library which suddenly made dates easy.",
   "keywords": [
     "time",

src/TimeZone.ts

@@ -1,3 +1,9 @@
-export interface TimeZone
+import {ZoneId} from './ZoneId';
+
+export abstract class TimeZone
 {
+    public static browser()
+    {
+        return ZoneId.browser();
+    }
 }

src/ZoneId.ts

@@ -4,12 +4,13 @@ import {TimeZone} from './TimeZone';
 
 export type ZoneIdString = 'Europe/Amsterdam' | 'UTC' | 'America/New_York'; // todo: add all other IDs that occur in tz database
 
-export class ZoneId implements TimeZone
+export class ZoneId extends TimeZone
 {
 	private readonly zoneId: ZoneIdString;
 
 	private constructor(zoneId: ZoneIdString)
 	{
+		super();
 		this.zoneId = requireValidZoneIdString(zoneId);
 	}
 

src/ZoneOffset.ts

@@ -1,11 +1,12 @@
 import {TimeZone} from './TimeZone';
 
-export class ZoneOffset implements TimeZone
+export class ZoneOffset extends TimeZone
 {
 	private readonly nrOfSeconds: number;
 
 	constructor(nrOfSeconds: number)
 	{
+		super();
 		this.nrOfSeconds = nrOfSeconds;
 	}
 }

src/index.ts

@@ -8,4 +8,5 @@ export {LocalDateTime} from './LocalDateTime';
 export {LocalTime, HourNumber, MinuteNumber} from './LocalTime';
 export {ZonedDateTime} from './ZonedDateTime';
 export {ZoneId, ZoneIdString} from './ZoneId';
-export {ZoneOffset} from './ZoneOffset';
+export {ZoneOffset} from './ZoneOffset';
+export {TimeZone} from './TimeZone';

tests/TimeZone.test.ts

@@ -0,0 +1,10 @@
+import {assert} from "chai";
+import {TimeZone, ZoneId} from "../src";
+
+describe('TimeZone', () => {
+    describe('.browser()', () => {
+        it('is the same as ZoneId.browser()', () => {
+            assert.isTrue(ZoneId.browser().equals(TimeZone.browser()))
+        })
+    });
+});