Refactor formatAs12HourClock function to improve time formatting logic and add comprehensive test cases

Author: TTiamiyu

Sprint-2/5-stretch-extend/format-time.js

@@ -4,10 +4,24 @@
 
 function formatAs12HourClock(time) {
   const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+  const minutes = time.slice(3, 5);
+  if (hours >= 12) {
+    const pmHours = String(hours === 12 ? 12 : hours - 12).padStart(2, "0");
+    return `${pmHours}:${minutes} pm`;
+  }
+  const amHours = String(hours === 0 ? 12 : hours).padStart(2, "0");
+  return `${amHours}:${minutes} am`;
+}
+
+function runTest(description, input, expected) {
+  const result = formatAs12HourClock(input);
+  console.assert(
+    result === expected,
+    `Test failed for ${description}: expected ${expected}, got ${result}`
+  );
+  if (result === expected) {
+    console.log(`Test passed for ${description}`);
   }
-  return `${time} am`;
 }
 
 const currentOutput = formatAs12HourClock("08:00");
@@ -23,3 +37,17 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+//== Additional Test Cases =//
+
+// Test case for standard AM time
+runTest("Standard early morning", "08:00", "08:00 am");
+runTest("standard late morning", "11:30", "11:30 am");
+
+// Test case for standard PM time
+runTest("Standard afternoon", "13:15", "01:15 pm");
+runTest("Standard evening", "20:45", "08:45 pm");
+
+// Test case for 12-hour threshold2
+runTest("Exact Noon (12:00)", "12:00", "12:00 pm");
+runTest("Exact Midnight", "00:00", "12:00 am");