test: add unit tests for getOrdinalDay function

src/calendar.mjs

@@ -28,3 +28,44 @@ export function getMalayalamDate(gregorianDate) {
     naksatra: naksatraName.trim()
   };
 }
+
+
+/**
+ * @returns {Date} - Current date and time in IST (Indian Standard Time) 
+ */
+export function getIstDate() {
+    // Construct date string formatted explicitly for India timezone
+    const now = new Date();
+    const formatter = new Intl.DateTimeFormat('en-US', {
+        timeZone: 'Asia/Kolkata',
+        year: 'numeric',
+        month: '2-digit',
+        day: '2-digit'
+    });
+    
+    // Formats into MM/DD/YYYY in IST
+    const [{ value: month }, , { value: day }, , { value: year }] = formatter.formatToParts(now);
+   
+    // Create UTC date anchored at 0:00:00 for that IST date
+    // Month is 0-indexed in JavaScript Date constructor, so subtract 1.
+    // Year and date don't need adjustment.
+    return new Date(Date.UTC(year, month - 1, day, 0, 0, 0));
+}
+
+
+/**
+ * Converts a number to its ordinal string representation (1st, 2nd, 3rd, 4th, etc.)
+ * @param {number} day - The day number (1-31)
+ * @returns {string} - Ordinal string (e.g., "4th")
+ */
+export function getOrdinalDay(day) {
+  const remainder = day % 100;
+  if (remainder >= 11 && remainder <= 13) return `${day}th`;
+  
+  const lastDigit = day % 10;
+  if (lastDigit === 1) return `${day}st`;
+  if (lastDigit === 2) return `${day}nd`;
+  if (lastDigit === 3) return `${day}rd`;
+  
+  return `${day}th`;
+}

src/index.mjs

@@ -1,5 +1,5 @@
 import Alexa from 'ask-sdk-core';
-import { getMalayalamDate } from './calendar.mjs';
+import { getMalayalamDate, getOrdinalDay, getIstDate } from './calendar.mjs';
 
 // 1. Core Logic: Handles explicit date/star question requests
 const GetMalayalamDateIntentHandler = {
@@ -74,45 +74,6 @@ const ErrorHandler = {
     }
 };
 
-// Get current gregorian date according to Indian Standard Time (IST)
-function getIstDate() {
-    // Construct date string formatted explicitly for India timezone
-    const now = new Date();
-    const formatter = new Intl.DateTimeFormat('en-US', {
-        timeZone: 'Asia/Kolkata',
-        year: 'numeric',
-        month: '2-digit',
-        day: '2-digit'
-    });
-    
-    // Formats into MM/DD/YYYY in IST
-    const [{ value: month }, , { value: day }, , { value: year }] = formatter.formatToParts(now);
-   
-    // Create UTC date anchored at 0:00:00 for that IST date
-    // Month is 0-indexed in JavaScript Date constructor, so subtract 1.
-    // Year and date don't need adjustment.
-    return new Date(Date.UTC(year, month - 1, day, 0, 0, 0));
-}
-
-
-/**
- * Converts a number to its ordinal string representation (1st, 2nd, 3rd, 4th, etc.)
- * @param {number} day - The day number (1-31)
- * @returns {string} - Ordinal string (e.g., "4th")
- */
-function getOrdinalDay(day) {
-  const remainder = day % 100;
-  if (remainder >= 11 && remainder <= 13) return `${day}th`;
-  
-  const lastDigit = day % 10;
-  if (lastDigit === 1) return `${day}st`;
-  if (lastDigit === 2) return `${day}nd`;
-  if (lastDigit === 3) return `${day}rd`;
-  
-  return `${day}th`;
-}
-
-
 // 3. Central Response Builder
 function generateCalendarResponse(handlerInput) {
     const date = getMalayalamDate(getIstDate());

tests/calendar.spec.mjs

@@ -1,4 +1,4 @@
-import { getMalayalamDate } from '../src/calendar.mjs';
+import { getMalayalamDate, getOrdinalDay } from '../src/calendar.mjs';
 import assert from 'node:assert';
 
 describe('getMalayalamDate unit test', () => {
@@ -12,3 +12,30 @@ describe('getMalayalamDate unit test', () => {
     });
   });
 });
+
+describe('getOrdinalDay function unit test', () => {
+  it('Returns correct ordinal for various days', () => {
+    const testCases = [
+      { day: 1, expected: '1st' },
+      { day: 2, expected: '2nd' },
+      { day: 3, expected: '3rd' },
+      { day: 4, expected: '4th' },
+      { day: 5, expected: '5th' },
+      { day: 11, expected: '11th' },
+      { day: 12, expected: '12th' },
+      { day: 13, expected: '13th' },
+      { day: 14, expected: '14th' },
+      { day: 20, expected: '20th' },
+      { day: 21, expected: '21st' },
+      { day: 22, expected: '22nd' },
+      { day: 23, expected: '23rd' },
+      { day: 24, expected: '24th' },
+      { day: 30, expected: '30th' },
+      { day: 31, expected: '31st' }
+    ];
+
+    testCases.forEach(({ day, expected }) => {
+      assert.strictEqual(getOrdinalDay(day), expected);
+    });
+  });
+});