Implements slot logic with the DatePicker, more tests for slots

test/lib/slots.test.ts

@@ -7,7 +7,7 @@ import timezone from 'dayjs/plugin/timezone';
 dayjs.extend(utc);
 dayjs.extend(timezone);
 
-MockDate.set('2021-06-20T12:00:00Z');
+MockDate.set('2021-06-20T11:59:59Z');
 
 it('can fit 24 hourly slots for an empty day', async () => {
   // 24h in a day.
@@ -19,4 +19,38 @@ it('can fit 24 hourly slots for an empty day', async () => {
     ],
     organizerTimeZone: 'Europe/London'
   })).toHaveLength(24);
+});
+
+it('only shows future booking slots on the same day', async () => {
+  // The mock date is 1s to midday, so 12 slots should be open given 0 booking notice.
+  expect(getSlots({
+    inviteeDate: dayjs(),
+    frequency: 60,
+    workingHours: [
+      { days: [...Array(7).keys()], startTime: 0, endTime: 1440 }
+    ],
+    organizerTimeZone: 'GMT'
+  })).toHaveLength(12);
+});
+
+it('can cut off dates that due to invitee timezone differences fall on the next day', async () => {
+  expect(getSlots({
+    inviteeDate: dayjs().tz('Europe/Amsterdam').startOf('day'), // time translation +01:00
+    frequency: 60,
+    workingHours: [
+      { days: [0], startTime: 1380, endTime: 1440 }
+    ],
+    organizerTimeZone: 'Europe/London'
+  })).toHaveLength(0);
+});
+
+it('can cut off dates that due to invitee timezone differences fall on the previous day', async () => {
+  expect(getSlots({
+    inviteeDate: dayjs().startOf('day'), // time translation -01:00
+    frequency: 60,
+    workingHours: [
+      { days: [0], startTime: 0, endTime: 60 }
+    ],
+    organizerTimeZone: 'Europe/London'
+  })).toHaveLength(0);
 });