Test cases for impossible dates in recurrence rule

Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

test/recur-006.sh

@@ -0,0 +1,50 @@
+#!/bin/sh
+# Ignore impossible dates.
+
+. "${TEST_INIT:-./test-init.sh}"
+
+if [ "$1" = 'actual' ]; then
+  "$CALCURSE" --read-only -D "$DATA_DIR"/ -c "$DATA_DIR/apts-recur" \
+    --startday=5/31/2019 --range=365 --filter-type recur-apt \
+    --filter-pattern impossible
+  "$CALCURSE" --read-only -D "$DATA_DIR"/ -c "$DATA_DIR/apts-recur" \
+    --startday=2/1/2020 --range=1500 --filter-type recur-event \
+    --filter-pattern February
+elif [ "$1" = 'expected' ]; then
+  cat <<EOD
+05/31/19:
+ - 07:25 -> 07:45
+	Ignore impossible dates
+
+07/31/19:
+ - 07:25 -> 07:45
+	Ignore impossible dates
+
+08/31/19:
+ - 07:25 -> 07:45
+	Ignore impossible dates
+
+10/31/19:
+ - 07:25 -> 07:45
+	Ignore impossible dates
+
+12/31/19:
+ - 07:25 -> 07:45
+	Ignore impossible dates
+
+01/31/20:
+ - 07:25 -> 07:45
+	Ignore impossible dates
+
+03/31/20:
+ - 07:25 -> 07:45
+	Ignore impossible dates
+02/29/20:
+ * Every 29 February since 2020
+
+02/29/24:
+ * Every 29 February since 2020
+EOD
+else
+  ./run-test "$0"
+fi