Fix 12-hour clock edge cases

Cover valid time boundaries and preserve minutes across conversion.

Author: BrianY315

format-clock-edge-cases/timeConverter.js

@@ -1,10 +1,19 @@
 function formatAs12HourClock(time) {
-
   const hours = Number(time.slice(0, 2));
+  const minutes = time.slice(3);
+
+  if (hours === 0) {
+    return `12:${minutes} am`;
+  }
 
   if (hours > 12) {
-    return `${hours - 12}:00 pm`;
+    return `${hours - 12}:${minutes} pm`;
   }
+
+  if (hours === 12) {
+    return `${time} pm`;
+  }
+
   return `${time} am`;
 }
 

format-clock-edge-cases/timeConverter.test.js

@@ -1,11 +1,23 @@
-import {formatAs12HourClock} from "./timeConverter.js";
-import assert from "node:assert";
+import { formatAs12HourClock } from "./timeConverter.js";
+import assert from "node:assert/strict";
 import test from "node:test";
 
-test("correctly convert time after 12:00", function(){
-    assert.equal(formatAs12HourClock("23:00"), "11:00 pm");
-});
+const cases = [
+    ["00:00", "12:00 am"],
+    ["00:01", "12:01 am"],
+    ["01:05", "01:05 am"],
+    ["08:00", "08:00 am"],
+    ["11:59", "11:59 am"],
+    ["12:00", "12:00 pm"],
+    ["12:34", "12:34 pm"],
+    ["13:00", "1:00 pm"],
+    ["15:45", "3:45 pm"],
+    ["23:00", "11:00 pm"],
+    ["23:59", "11:59 pm"],
+];
 
-test("can correctly convert morning time", function() {
-    assert.equal(formatAs12HourClock("08:00"), "08:00 am");
-});
+for (const [time, expected] of cases) {
+    test(`${time} converts to ${expected}`, () => {
+        assert.equal(formatAs12HourClock(time), expected);
+    });
+}