test: add test preventing 1W,2W regression (#9)

In versions previous to October 2024,
1W,2W and 1W,3W in DOM field would cause CRONs to trigger as often as possible from 1st to 2nd/3rd,
as handle_w_dom() would always go to the 1st (and calculate from there) when it was in the checked W flag range, which starts up to 2 days before the current day.
This bug was fixed unintentionally with the rework of W and L flag handling, but it would be good to include the tests to avoid regressions.

Author: Kniggebrot

ccronexpr_test.c

@@ -510,6 +510,26 @@ void test_expr() {
     assert(check_next("0 0 0 1,1W,15W * *",     "2021-12-31_01:02:03", "2022-01-01_00:00:00"));
     assert(check_next("0 0 0 1,1W,15W * *",     "2022-01-01_01:02:03", "2022-01-03_00:00:00"));
     assert(check_next("0 0 0 1,1W,15W * *",     "2022-01-03_01:02:03", "2022-01-14_00:00:00"));
+    // Testcase for new years eve bug
+    assert(check_next("0 0 12 1W,2W * ?","2025-01-01_11:00:00", "2025-01-01_12:00:00"));
+    assert(check_next("0 0 12 1W,2W * ?","2025-01-01_13:01:00", "2025-01-02_12:00:00"));
+    assert(check_next("0 0 12 1W,2W * ?","2025-01-02_12:01:00", "2025-02-03_12:00:00"));
+    assert(check_next("0 0 12 1W,3W * ?","2025-01-01_11:00:00", "2025-01-01_12:00:00"));
+    assert(check_next("0 0 12 1W,3W * ?","2025-01-01_13:01:00", "2025-01-03_12:00:00"));
+    assert(check_next("0 0 12 1W,3W * ?","2025-01-03_12:01:00", "2025-02-03_12:00:00"));
+    assert(check_next("0 0 12 1W,15W * ?","2025-01-01_11:00:00", "2025-01-01_12:00:00"));
+    assert(check_next("0 0 12 1W,15W * ?","2025-01-01_13:01:00", "2025-01-15_12:00:00"));
+    assert(check_next("0 0 12 1W,15W * ?","2025-01-15_12:01:00", "2025-02-03_12:00:00"));
+    // Repeat for 1st May, a thursday
+    assert(check_next("0 0 12 1W,2W * ?","2025-05-01_11:00:00", "2025-05-01_12:00:00"));
+    assert(check_next("0 0 12 1W,2W * ?","2025-05-01_13:01:00", "2025-05-02_12:00:00"));
+    assert(check_next("0 0 12 1W,2W * ?","2025-05-02_12:01:00", "2025-06-02_12:00:00"));
+    assert(check_next("0 0 12 1W,3W * ?","2025-05-01_11:00:00", "2025-05-01_12:00:00"));
+    assert(check_next("0 0 12 1W,3W * ?","2025-05-01_13:01:00", "2025-05-02_12:00:00"));
+    assert(check_next("0 0 12 1W,3W * ?","2025-05-02_12:01:00", "2025-06-02_12:00:00"));
+    assert(check_next("0 0 12 1W,15W * ?","2025-05-01_11:00:00", "2025-05-01_12:00:00"));
+    assert(check_next("0 0 12 1W,15W * ?","2025-05-01_13:01:00", "2025-05-15_12:00:00"));
+    assert(check_next("0 0 12 1W,15W * ?","2025-05-15_12:01:00", "2025-06-02_12:00:00"));
 }
 
 void test_parse() {