Adding a test framework for sphinx-simplepdf

[kreuzberger]

First implementation of a tox based test framework, trying to handle issues #112 and #120 in current versions

[kreuzberger]

Currently there is no github action to perform tests, nor are lint tests etc working. The only tests working are e.g.
tox -e py313-sphinx82
which will lead to errors due to #112.

E       assert 16 == 0
E        +  where 16 = len(["ERROR: Content discarded: target points to undefined anchor ('url', ('internal', 'document-chapter1#section-1-1'))",...ion-1-1 for internal URI reference', 'ERROR: No anchor #document-chapter1#section-1-1 for internal URI reference', ...])

[kreuzberger]

for #120 and sphinx 7.4 the tests fails cause the links associcated with Chapter 1 should lead to page 4 and the Chapter 2 links to page 5. In the current version they links to page 3/4.

      text = extract_pdf_text(pdf_path)
    
>       assert """
    Table of Contents
    
    Contents:
    
    Chapter 1: Getting Started
    
    • Section 1.1
    • Section 1.2
    
    Chapter 2: Advanced Topics
    
    • Section 2.1
    • Section 2.2
    
    4
    
    4
    
    4
    
    5
    
    5
    
    5
    """ in text

[kreuzberger]

@ubmarco any suggestions?