Adds input for all 3 cases

src/pystitcher/stitcher.py

@@ -96,7 +96,7 @@ class Stitcher:
                     outer_level = self._get_level_from_page_number(b.page+1)
                     # _logger.info("Got Level: %s", outer_level)
                     if (self._flattenBookmarks()):
-                        increment = 1
+                        increment = 2
                     else:
                         increment = b.level
                     level = outer_level + increment - 1

tests/book-clean.md

@@ -0,0 +1,12 @@
+existing_bookmarks: remove
+# Super Potato Book
+
+# Volume 1
+
+[Part 1](2page.pdf)
+[Part 2](2page.pdf)
+
+# Volume 2
+
+[Part 3](2page.pdf)
+[Part 4](2page.pdf)

tests/book-flatten.md

@@ -0,0 +1,12 @@
+existing_bookmarks: flatten
+# Super Potato Book
+
+# Volume 1
+
+[Part 1](2page.pdf)
+[Part 2](2page.pdf)
+
+# Volume 2
+
+[Part 3](2page.pdf)
+[Part 4](2page.pdf)