Add tests for alphabetic counter sets.

org_mode_samples/greater_element/plain_list/alphabetic_counter_set.org

@@ -0,0 +1,22 @@
+# An ordered list starting at 3
+1. [@3] foo
+
+
+# An ordered list starting at 11
+1. [@D] bar
+
+
+# An ordered list starting at 1 with the contents of "[@kk] baz"
+1. [@kk] baz
+
+
+# A paragraph when org-list-allow-alphabetical is nil
+m. lorem
+
+
+# A paragraph when org-list-allow-alphabetical is nil
+m. [@k] ipsum
+
+
+# An unordered list with :counter set to 3
+- [@3] dolar

org_mode_samples/greater_element/plain_list/alphabetic_list_larger_than_26.org

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+# Alphabetic lists larger than 26 elements should become numbered. From M-x describe-variable org-list-allow-alphabetical:
+#
+# > Lists with more than 26 items will fallback to standard numbering.
+a. 1
+a. 2
+a. 3
+a. 4
+a. 5
+a. 6
+a. 7
+a. 8
+a. 9
+a. 10
+a. 11
+a. 12
+a. 13
+a. 14
+a. 15
+a. 16
+a. 17
+a. 18
+a. 19
+a. 20
+a. 21
+a. 22
+a. 23
+a. 24
+a. 25
+a. 26
+a. 27