@@ -170,6 +170,7 @@ func TestIsWithinRange(t *testing.T) {
170170spec string
171171at time.Time
172172expectedWithinRange bool
173+ expectedError string
173174}{
174175// "* 9-18 * * 1-5" should be interpreted as a continuous time range from 08:59:00 to 18:58:59, Monday through Friday
175176{
@@ -238,13 +239,30 @@ func TestIsWithinRange(t *testing.T) {
238239at :mustParseTime (t ,time .RFC1123 ,"Sun, 08 Jun 2025 14:00:00 UTC" ),
239240expectedWithinRange :false ,
240241},
242+ {
243+ name :"Check that Sunday is supported with value 0" ,
244+ spec :"* 9-18 * * 0" ,
245+ at :mustParseTime (t ,time .RFC1123 ,"Sun, 08 Jun 2025 14:00:00 UTC" ),
246+ expectedWithinRange :true ,
247+ },
248+ {
249+ name :"Check that value 7 is rejected as out of range" ,
250+ spec :"* 9-18 * * 7" ,
251+ at :mustParseTime (t ,time .RFC1123 ,"Sun, 08 Jun 2025 14:00:00 UTC" ),
252+ expectedError :"end of range (7) above maximum (6): 7" ,
253+ },
241254}
242255
243256for _ ,testCase := range testCases {
244257testCase := testCase
245258t .Run (testCase .name ,func (t * testing.T ) {
246259t .Parallel ()
247260sched ,err := cron .Weekly (testCase .spec )
261+ if testCase .expectedError != "" {
262+ require .Error (t ,err )
263+ require .Contains (t ,err .Error (),testCase .expectedError )
264+ return
265+ }
248266require .NoError (t ,err )
249267withinRange := sched .IsWithinRange (testCase .at )
250268require .Equal (t ,testCase .expectedWithinRange ,withinRange )