Add comprehensive edge case tests for 12-hour clock

Author: lamlakamana-oss

Sprint-3/5-stretch-extend/format-time.js

@@ -23,3 +23,38 @@ console.assert(
   currentOutput2 === targetOutput2,
   `current output: ${currentOutput2}, target output: ${targetOutput2}`
 );
+// Test 3: Edge case for 12:00 (Noon)
+// The current function logic thinks 12 > 12 is false, so it returns "12:00 am". 
+// This is technically a bug in the provided function, but a good test case!
+const currentOutput3 = formatAs12HourClock("12:00");
+const targetOutput3 = "12:00 pm"; // Correct expectation
+console.assert(
+  currentOutput3 === targetOutput3,
+  `Noon Test Failed -> current output: ${currentOutput3}, target output: ${targetOutput3}`
+);
+
+// Test 4: Check for formatting bug (dropping minutes)
+// The current function returns `${hours - 12}:00 pm` which ignores the minutes.
+const currentOutput4 = formatAs12HourClock("13:45");
+const targetOutput4 = "01:45 pm"; 
+console.assert(
+  currentOutput4 === targetOutput4,
+  `Minute Formatting Failed -> current output: ${currentOutput4}, target output: ${targetOutput4}`
+);
+
+// Test 5: Test single digit hour formatting
+// Usually, 12-hour clocks are written as "01:00 pm", not "1:00 pm"
+const currentOutput5 = formatAs12HourClock("13:00");
+const targetOutput5 = "01:00 pm"; 
+console.assert(
+  currentOutput5 === targetOutput5,
+  `Hour Padding Failed -> current output: ${currentOutput5}, target output: ${targetOutput5}`
+);
+
+// Test 6: Midnight check
+const currentOutput6 = formatAs12HourClock("00:00");
+const targetOutput6 = "12:00 am";
+console.assert(
+  currentOutput6 === targetOutput6,
+  `Midnight Test Failed -> current output: ${currentOutput6}, target output: ${targetOutput6}`
+);