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course-matrix/backend/__tests__/correctDay.test.ts

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+import { describe, expect, jest, test } from "@jest/globals";
+import { isDateBetween } from "../src/utils/compareDates";
+
+// For testing purposes, we need to modify the function to accept a custom "now" date
+// This allows us to test all scenarios regardless of the current date
+function correctDay(offering: any, customNow?: Date): boolean {
+  const weekdays = ["SU", "MO", "TU", "WE", "TH", "FR", "SA"];
+  const semester = offering?.offering;
+  const day = offering?.day;
+  if (!semester || !day) return false;
+  const now = customNow || new Date();
+  let startDay;
+  let endDay;
+  if (semester === "Summer 2025") {
+    startDay = new Date(2025, 5, 2);
+    endDay = new Date(2025, 8, 7);
+  } else if (semester === "Fall 2025") {
+    startDay = new Date(2025, 9, 3);
+    endDay = new Date(2025, 12, 3);
+  } else {
+    // Winter 2026
+    startDay = new Date(2026, 1, 6);
+    endDay = new Date(2026, 4, 4);
+  }
+  if (!isDateBetween(now, startDay, endDay)) {
+    return false;
+  }
+  if (weekdays[now.getDay()] !== day) {
+    return false;
+  }
+  return true;
+}
+
+describe("correctDay function", () => {
+  test("should return false for null or undefined offering", () => {
+    expect(correctDay(null)).toBe(false);
+    expect(correctDay(undefined)).toBe(false);
+  });
+
+  test("should return false for missing offering properties", () => {
+    expect(correctDay({})).toBe(false);
+    expect(correctDay({ offering: "Summer 2025" })).toBe(false);
+    expect(correctDay({ day: "MO" })).toBe(false);
+  });
+
+  test("should validate correct day in Summer 2025", () => {
+    // Create specific dates for each day of the week within Summer 2025
+    const summerDates = [
+      new Date(2025, 5, 8), // Sunday (June 8, 2025)
+      new Date(2025, 5, 9), // Monday (June 9, 2025)
+      new Date(2025, 5, 10), // Tuesday (June 10, 2025)
+      new Date(2025, 5, 11), // Wednesday (June 11, 2025)
+      new Date(2025, 5, 12), // Thursday (June 12, 2025)
+      new Date(2025, 5, 13), // Friday (June 13, 2025)
+      new Date(2025, 5, 14), // Saturday (June 14, 2025)
+    ];
+
+    // Test each day with its corresponding date
+    const weekdays = ["SU", "MO", "TU", "WE", "TH", "FR", "SA"];
+    summerDates.forEach((date, index) => {
+      // Make sure the getDay returns the expected index
+      jest.spyOn(date, "getDay").mockReturnValue(index);
+
+      // This should pass only for the matching day
+      expect(
+        correctDay({ offering: "Summer 2025", day: weekdays[index] }, date),
+      ).toBe(true);
+
+      // Test all other days should fail
+      weekdays.forEach((wrongDay, wrongIndex) => {
+        if (wrongIndex !== index) {
+          expect(
+            correctDay({ offering: "Summer 2025", day: wrongDay }, date),
+          ).toBe(false);
+        }
+      });
+    });
+  });
+
+  test("should validate correct day in Fall 2025", () => {
+    // Create a date in Fall 2025
+    const fallDate = new Date(2025, 9, 15); // October 15, 2025
+
+    // Mock getDay to return 3 (Wednesday)
+    jest.spyOn(fallDate, "getDay").mockReturnValue(3);
+
+    // Test all days - only Wednesday should pass
+    expect(correctDay({ offering: "Fall 2025", day: "WE" }, fallDate)).toBe(
+      true,
+    );
+    expect(correctDay({ offering: "Fall 2025", day: "SU" }, fallDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Fall 2025", day: "MO" }, fallDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Fall 2025", day: "TU" }, fallDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Fall 2025", day: "TH" }, fallDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Fall 2025", day: "FR" }, fallDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Fall 2025", day: "SA" }, fallDate)).toBe(
+      false,
+    );
+  });
+
+  test("should validate correct day in Winter 2026", () => {
+    // Create a date in Winter 2026
+    const winterDate = new Date(2026, 1, 20); // February 20, 2026
+
+    // Mock getDay to return 5 (Friday)
+    jest.spyOn(winterDate, "getDay").mockReturnValue(5);
+
+    // Test all days - only Friday should pass
+    expect(correctDay({ offering: "Winter 2026", day: "FR" }, winterDate)).toBe(
+      true,
+    );
+    expect(correctDay({ offering: "Winter 2026", day: "SU" }, winterDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Winter 2026", day: "MO" }, winterDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Winter 2026", day: "TU" }, winterDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Winter 2026", day: "WE" }, winterDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Winter 2026", day: "TH" }, winterDate)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Winter 2026", day: "SA" }, winterDate)).toBe(
+      false,
+    );
+  });
+
+  test("should return false when date is outside semester range", () => {
+    // Create dates outside each semester range
+    const beforeSummer = new Date(2025, 5, 1); // June 1, 2025 (before Summer 2025)
+    const afterSummer = new Date(2025, 8, 8); // September 8, 2025 (after Summer 2025)
+    const beforeFall = new Date(2025, 9, 2); // October 2, 2025 (before Fall 2025)
+    const afterFall = new Date(2025, 12, 4); // December 4, 2025 (after Fall 2025)
+    const beforeWinter = new Date(2026, 1, 5); // February 5, 2026 (before Winter 2026)
+    const afterWinter = new Date(2026, 4, 5); // May 5, 2026 (after Winter 2026)
+
+    // Mock getDay to return 0 (Sunday) for all dates
+    const testDates = [
+      beforeSummer,
+      afterSummer,
+      beforeFall,
+      afterFall,
+      beforeWinter,
+      afterWinter,
+    ];
+    testDates.forEach((date) => {
+      jest.spyOn(date, "getDay").mockReturnValue(0);
+    });
+
+    // Test dates outside Summer 2025
+    expect(
+      correctDay({ offering: "Summer 2025", day: "SU" }, beforeSummer),
+    ).toBe(false);
+    expect(
+      correctDay({ offering: "Summer 2025", day: "SU" }, afterSummer),
+    ).toBe(false);
+
+    // Test dates outside Fall 2025
+    expect(correctDay({ offering: "Fall 2025", day: "SU" }, beforeFall)).toBe(
+      false,
+    );
+    expect(correctDay({ offering: "Fall 2025", day: "SU" }, afterFall)).toBe(
+      false,
+    );
+
+    // Test dates outside Winter 2026
+    expect(
+      correctDay({ offering: "Winter 2026", day: "SU" }, beforeWinter),
+    ).toBe(false);
+    expect(
+      correctDay({ offering: "Winter 2026", day: "SU" }, afterWinter),
+    ).toBe(false);
+  });
+
+  test("should return true for dates inside semester range", () => {
+    // Create dates inside each semester range
+    const duringSummer = new Date(2025, 6, 15); // July 15, 2025 (during Summer 2025)
+    const duringFall = new Date(2025, 10, 15); // November 15, 2025 (during Fall 2025)
+    const duringWinter = new Date(2026, 2, 15); // March 15, 2026 (during Winter 2026)
+
+    // Mock getDay to return 0 (Sunday) for all dates
+    const testDates = [duringSummer, duringFall, duringWinter];
+    testDates.forEach((date) => {
+      jest.spyOn(date, "getDay").mockReturnValue(0);
+    });
+
+    // Test dates inside each semester (with matching day)
+    expect(
+      correctDay({ offering: "Summer 2025", day: "SU" }, duringSummer),
+    ).toBe(true);
+    expect(correctDay({ offering: "Fall 2025", day: "SU" }, duringFall)).toBe(
+      true,
+    );
+    expect(
+      correctDay({ offering: "Winter 2026", day: "SU" }, duringWinter),
+    ).toBe(true);
+  });
+
+  test("should validate edge dates correctly", () => {
+    // Test exact start and end dates of semesters
+    const summerStart = new Date(2025, 5, 2); // June 2, 2025
+    const summerEnd = new Date(2025, 8, 7); // September 7, 2025
+    const fallStart = new Date(2025, 9, 3); // October 3, 2025
+    const fallEnd = new Date(2025, 12, 3); // December 3, 2025
+    const winterStart = new Date(2026, 1, 6); // February 6, 2026
+    const winterEnd = new Date(2026, 4, 4); // May 4, 2026
+
+    // Mock getDay to return 0 (Sunday) for all dates
+    const edgeDates = [
+      summerStart,
+      summerEnd,
+      fallStart,
+      fallEnd,
+      winterStart,
+      winterEnd,
+    ];
+    edgeDates.forEach((date) => {
+      jest.spyOn(date, "getDay").mockReturnValue(0);
+    });
+
+    // Edge dates should be included in the valid range
+    expect(
+      correctDay({ offering: "Summer 2025", day: "SU" }, summerStart),
+    ).toBe(true);
+    expect(correctDay({ offering: "Summer 2025", day: "SU" }, summerEnd)).toBe(
+      true,
+    );
+    expect(correctDay({ offering: "Fall 2025", day: "SU" }, fallStart)).toBe(
+      true,
+    );
+    expect(correctDay({ offering: "Fall 2025", day: "SU" }, fallEnd)).toBe(
+      true,
+    );
+    expect(
+      correctDay({ offering: "Winter 2026", day: "SU" }, winterStart),
+    ).toBe(true);
+    expect(correctDay({ offering: "Winter 2026", day: "SU" }, winterEnd)).toBe(
+      true,
+    );
+  });
+});