add GodOfTimeService.tick() to easily increment time

packages/backend/src/core/TimeService.ts

@@ -17,12 +17,12 @@ export abstract class TimeService<TTimer extends Timer = Timer> implements OnApp
 	protected constructor() {}
 
 	/**
-	 * Returns Date.now()
+	 * Returns the current time, in milliseconds since the Unix epoch.
 	 */
 	public abstract get now(): number;
 
 	/**
-	 * Returns a new Date instance.
+	 * Returns a new Date instance representing the current time.
 	 */
 	public get date(): Date {
 		return new Date(this.now);

packages/backend/test/misc/GodOfTimeService.ts

@@ -5,6 +5,7 @@
 
 import { Injectable } from '@nestjs/common';
 import { TimeService, Timer } from '@/core/TimeService.js';
+import { addPatch, type DatePatch } from '@/misc/patch-date.js';
 
 /**
  * Fake implementation of TimeService that allows manual control of time.
@@ -52,6 +53,28 @@ export class GodOfTimeService extends TimeService<GodsOwnTimer> {
 		this._now = value;
 	}
 
+	/**
+	 * Get or set the current time, as a JavaScript Date object.
+	 */
+	get date(): Date {
+		return super.date;
+	}
+	set date(value: Date) {
+		this.now = value.getTime();
+	}
+
+	/**
+	 * Moves time by a relative "tick" amount.
+	 * Ticks can be a raw number of milliseconds, or an inline object containing time and/or date increments.
+	 */
+	public tick(tick: number | DatePatch) {
+		if (typeof(tick) === 'number') {
+			this.now += tick;
+		} else {
+			this.date = addPatch(this.date, tick);
+		}
+	}
+
 	/**
 	 * Clears all timers and resets to time=0.
 	 */