add previous and next buttons (lectures are separate from assignments/quizzes/pages)

src/app/course/[courseName]/hooks/navigationLogic.test.ts

@@ -0,0 +1,70 @@
+import { describe, it, expect } from "vitest";
+import {
+  getOrderedItems,
+  getOrderedLectures,
+  getNavigationLinks,
+  OrderedCourseItem,
+} from "./navigationLogic";
+import { CalendarItemsInterface } from "../context/calendarItemsContext";
+
+describe("navigationLogic", () => {
+  const courseName = "testCourse";
+
+  it("getOrderedItems should order items by date, then alphabetically by name", () => {
+    const createMock = (
+      date: string,
+      name: string,
+      key: "assignments" | "quizzes" | "pages"
+    ) =>
+      ({
+        [date]: { "Module 1": { [key]: [{ name }] } },
+      } as unknown as CalendarItemsInterface);
+
+    const orderedItems = getOrderedItems(
+      courseName,
+      createMock("2023-01-01", "Z Assignment", "assignments"),
+      createMock("2023-01-01", "A Quiz", "quizzes"),
+      createMock("2023-01-02", "B Assignment", "assignments"),
+      createMock("2023-01-02", "A Page", "pages")
+    );
+
+    expect(orderedItems.map((i) => `${i.date} ${i.name}`)).toEqual([
+      "2023-01-01 A Quiz",
+      "2023-01-01 Z Assignment",
+      "2023-01-02 A Page",
+      "2023-01-02 B Assignment",
+    ]);
+  });
+
+  it("getNavigationLinks should handle wrapping and normal navigation", () => {
+    const items: OrderedCourseItem[] = [
+      { type: "assignment", name: "1", moduleName: "M", date: "D", url: "u1" },
+      { type: "quiz", name: "2", moduleName: "M", date: "D", url: "u2" },
+      { type: "page", name: "3", moduleName: "M", date: "D", url: "u3" },
+    ];
+
+    // Forward wrap (last -> first)
+    expect(getNavigationLinks(items, "page", "3", "M").nextUrl).toBe("u1");
+
+    // Backward wrap (first -> last)
+    expect(getNavigationLinks(items, "assignment", "1", "M").previousUrl).toBe(
+      "u3"
+    );
+
+    // Normal navigation (middle)
+    const middle = getNavigationLinks(items, "quiz", "2", "M");
+    expect(middle.previousUrl).toBe("u1");
+    expect(middle.nextUrl).toBe("u3");
+  });
+
+  it("getOrderedLectures should flatten weeks and generate correct URLs", () => {
+    const weeks = [
+      { lectures: [{ date: "01/01/2023" }] },
+      { lectures: [{ date: "01/02/2023" }, { date: "01/03/2023" }] },
+    ];
+    const lectures = getOrderedLectures(weeks as any, courseName);
+    expect(lectures).toHaveLength(3);
+    expect(lectures[0].url).toContain(encodeURIComponent("01/01/2023"));
+    expect(lectures[0].type).toBe("lecture");
+  });
+});