CommentPagerTest::testCommentNewPageIndicator in core/modules/comment/tests/comment.test

Tests comment_new_page_count().

CommentPagerTest::testCommentOrderingThreading in core/modules/comment/tests/comment.test

Tests comment ordering and threading.

CommentPagerTest::testCommentPaging in core/modules/comment/tests/comment.test

Confirms comment paging works correctly with flat and threaded comments.

comment_get_display_ordinal in core/modules/comment/comment.module

Gets the display ordinal for a comment, starting from 0.

comment_get_thread in core/modules/comment/comment.module

Retrieves comments for a thread.

comment_new_page_count in core/modules/comment/comment.module

Calculates the page number for the first new comment.

_comment_get_modes in core/modules/comment/comment.module

Returns an array of viewing modes for comment listings.