Port EventFactory code from #181

Code from #181 adds ability to fake events in the past, future or present.
Taken verbatim from commit 18a952c.

tests/data/EventFactory.ts

@@ -22,9 +22,9 @@ export class EventFactory {
     return substitutes.map((sub) => EventModel.merge(EventFactory.fake(), sub));
   }
 
-  public static fake(substitute?: Partial<EventModel>): EventModel {
+  public static fake(): EventModel {
     const [start, end] = EventFactory.randomTime();
-    const fake = EventModel.create({
+    return EventModel.create({
       uuid: uuid(),
       organization: FactoryUtils.pickRandomValue(EventFactory.ORGS),
       title: faker.datatype.hexaDecimal(10),
@@ -37,19 +37,56 @@ export class EventFactory {
       requiresStaff: FactoryUtils.getRandomBoolean(),
       staffPointBonus: EventFactory.randomPointValue(),
     });
-    return EventModel.merge(fake, substitute);
+  }
+
+  public static fakePastEvent(daysAgo = 1): EventModel {
+    const [start, end] = EventFactory.randomPastTime(daysAgo);
+    return EventFactory.with({ start, end })[0];
+  }
+
+  public static fakeOngoingEvent(): EventModel {
+    const [start, end] = EventFactory.randomOngoingTime();
+    return EventFactory.with({ start, end })[0];
+  }
+
+  public static fakeFutureEvent(daysAhead = 1): EventModel {
+    const [start, end] = EventFactory.randomFutureTime(daysAhead);
+    return EventFactory.with({ start, end })[0];
   }
 
   private static randomTime(): [Date, Date] {
-    // between last and next week
-    const days = FactoryUtils.getRandomNumber(-7, 7);
-    // between 8 AM and 6 PM
-    const hour = FactoryUtils.getRandomNumber(9, 19);
-    // between 0.5 and 2.5 hours long, rounded to the half hour
-    const duration = FactoryUtils.getRandomNumber(30, 150, 30);
-    const start = moment().subtract(days, 'days').hour(hour);
+    // random day between last and next week
+    const day = FactoryUtils.getRandomNumber(-7, 7);
+    return EventFactory.randomIntervalInDay(day);
+  }
+
+  private static randomPastTime(daysAgo: number): [Date, Date] {
+    // random day between daysAgo and a week before daysAgo
+    const day = FactoryUtils.getRandomNumber(-daysAgo - 7, -daysAgo);
+    return EventFactory.randomIntervalInDay(day);
+  }
+
+  private static randomOngoingTime(): [Date, Date] {
+    // 0, 30 mins, or 1 hour before now
+    const currentHour = moment().hour();
+    const hour = FactoryUtils.getRandomNumber(currentHour - 1, currentHour, 0.5);
+    return EventFactory.randomIntervalInDay(0, hour);
+  }
+
+  private static randomFutureTime(daysAhead: number): [Date, Date] {
+    // random day between daysAhead and a week after daysAhead
+    const day = FactoryUtils.getRandomNumber(daysAhead, daysAhead + 7);
+    return EventFactory.randomIntervalInDay(day);
+  }
+
+  private static randomIntervalInDay(day: number, hour?: number): [Date, Date] {
+    // default between 8 AM and 6 PM
+    if (!hour) hour = FactoryUtils.getRandomNumber(9, 19);
+    // between 1 and 2.5 hours long, rounded to the half hour
+    const duration = FactoryUtils.getRandomNumber(60, 150, 30);
+    const start = moment().add(day, 'days').hour(hour);
     const end = moment(start.valueOf()).add(duration, 'minutes');
-    return [new Date(start.valueOf()), new Date(end.valueOf())];
+    return [start.toDate(), end.toDate()];
   }
 
   private static randomPointValue(): number {