Test and simplify convert24to12, including making it resistant to out of bounds values.

Author: srvance

jquery-ui-timepicker-addon.js

@@ -1814,9 +1814,7 @@
 	* Returns 12 hour without leading 0
 	*/
 	var convert24to12 = function(hour) {
-		if (hour > 12) {
-			hour = hour - 12;
-		}
+		hour %= 12;
 
 		if (hour === 0) {
 			hour = 12;
@@ -2112,7 +2110,8 @@
 	 */
 	$.timepicker.util = {
 		_extendRemove: extendRemove,
-		_isEmptyObject: isEmptyObject
+		_isEmptyObject: isEmptyObject,
+		_convert24to12: convert24to12
 	};
 
 	/*

test/jquery-ui-timepicker-addon_spec.js

@@ -65,5 +65,29 @@ describe('datetimepicker', function() {
 				expect(util._isEmptyObject(testObject)).toBe(true);
 			})
 		});
+
+		describe('convert24to12', function() {
+			it('should return the value for a non-zero value less than 12', function() {
+				var expectedHour = 6;
+
+				expect(util._convert24to12(expectedHour)).toBe("" + expectedHour);
+			});
+
+			it('should return 12 hours less if the value is greater than 12 and less than 24', function() {
+				var expectedHour = 7;
+
+				expect(util._convert24to12(expectedHour + 12)).toBe("" + expectedHour);
+			});
+
+			it('should return 12 if the normalized value is 0', function() {
+				expect(util._convert24to12(0)).toBe('12');
+			});
+
+			it('should normalize values that are clearly out of the expected range', function() {
+				var expectedValue = 11;
+
+				expect(util._convert24to12(expectedValue + 12 * 3)).toBe("" + expectedValue);
+			})
+		});
 	});
 });