Added event validation at time of processing in Events constructor. Events must have a valid date and title to be included. Updated tests.

src/EventGrouping/index.test.ts

@@ -20,8 +20,6 @@ const mockSortedEvents = [
   },
 ];
 
-console.log(EventGrouping);
-
 describe("groupEventsByDay should", () => {
   const eventGrouping = new EventGrouping(mockSortedEvents, GroupTypes.Day);
 

src/Events/index.test.ts

@@ -0,0 +1,57 @@
+const Events = require("./index").default;
+
+const mockEventsAllValid = [
+  {
+    date: "2022-3-27",
+    title: "d's birthday",
+  },
+  {
+    date: "2022-3-25",
+    title: "my birthday",
+  },
+  {
+    date: "2022-3-25",
+    title: "buy cake for 27th",
+  },
+  {
+    date: "2022-3-20",
+    title: "first day of spring",
+  },
+];
+
+const mockEventsAllInvalid = [
+  {
+    date: new Date("haha"),
+    title: "first day of spring",
+  },
+  {
+    date: "2022-3-25",
+  },
+];
+
+describe("Events constructor should", () => {
+  describe("When the events are valid", () => {
+    const events = new Events(mockEventsAllValid);
+
+    test("generate the correct number of events", () => {
+      expect(events.sortedEvents.length).toEqual(4);
+    });
+
+    test("sort the events by date, ascending", () => {
+      const firstEventDate = new Date(events.sortedEvents[0].date).getDate();
+      const lastEventDate = new Date(
+        events.sortedEvents[events.sortedEvents.length - 1].date
+      ).getDate();
+      expect(firstEventDate).toEqual(20);
+      expect(lastEventDate).toEqual(27);
+    });
+  });
+
+  describe("When the events are invalid", () => {
+    const events = new Events(mockEventsAllInvalid);
+
+    test("generate the correct number of events", () => {
+      expect(events.sortedEvents.length).toEqual(0);
+    });
+  });
+});

src/Events/index.ts

@@ -1,15 +1,24 @@
+import { isValid } from "date-fns";
 import Event from "./Event";
 
 export default class Events {
-  sortedEvents: Event[];
+  public sortedEvents: Event[];
 
   constructor(events: Event[]) {
     this.sortedEvents = this.processEvents(events);
   }
 
-  processEvents(events): Event[] {
-    const _events = events.map((event) => new Event(event));
+  private processEvents(events): Event[] {
+    const _events = events.reduce((collection, event) => {
+      // only include valid events
+      if (event.title && event.date && isValid(new Date(event.date))) {
+        collection.push(new Event(event));
+      }
 
+      return collection;
+    }, []);
+
+    // sort events by date, in ascending order
     return _events.sort((a, b) => a.date - b.date);
   }
 }