Sprint 2 extend: add edge case tests and fix 12-hour clock conversion

Author: Richiealx

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

@@ -3,11 +3,17 @@
 // Your task is to write tests for as many different groups of input data or edge cases as you can, and fix any bugs you find.
 
 function formatAs12HourClock(time) {
-  const hours = Number(time.slice(0, 2));
-  if (hours > 12) {
-    return `${hours - 12}:00 pm`;
-  }
-  return `${time} am`;
+  const hours24 = Number(time.slice(0, 2));
+  const minutes = time.slice(3, 5);
+
+  const period = hours24 >= 12 ? "pm" : "am";
+
+  let hours12 = hours24 % 12;
+  if (hours12 === 0) hours12 = 12;
+
+  const paddedHours12 = String(hours12).padStart(2, "0");
+
+  return `${paddedHours12}:${minutes} ${period}`;
 }
 
 const currentOutput = formatAs12HourClock("08:00");
@@ -23,3 +29,44 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+
+
+
+// --------------------
+// Extra tests (edge cases + minutes)
+// --------------------
+
+// Midnight (00:00) should be 12:00 am
+console.assert(
+  formatAs12HourClock("00:00") === "12:00 am",
+  `current output: ${formatAs12HourClock("00:00")}, target output: 12:00 am`
+);
+
+// Noon (12:00) should be 12:00 pm
+console.assert(
+  formatAs12HourClock("12:00") === "12:00 pm",
+  `current output: ${formatAs12HourClock("12:00")}, target output: 12:00 pm`
+);
+
+// Minutes must be preserved
+console.assert(
+  formatAs12HourClock("23:15") === "11:15 pm",
+  `current output: ${formatAs12HourClock("23:15")}, target output: 11:15 pm`
+);
+
+console.assert(
+  formatAs12HourClock("13:05") === "01:05 pm",
+  `current output: ${formatAs12HourClock("13:05")}, target output: 01:05 pm`
+);
+
+// Morning should stay am
+console.assert(
+  formatAs12HourClock("01:09") === "01:09 am",
+  `current output: ${formatAs12HourClock("01:09")}, target output: 01:09 am`
+);
+
+// Boundary just before noon
+console.assert(
+  formatAs12HourClock("11:59") === "11:59 am",
+  `current output: ${formatAs12HourClock("11:59")}, target output: 11:59 am`
+);