Add multiple-meta-data.* (#13177)

* Add multiple-meta-data.*

* Refine README.md for test files

Author: koppor

jablib/src/test/latex/pdfs/multiple-meta-data.bib

@@ -0,0 +1,7 @@
+@article{test
+    title     = {title-from-embedded-bibtex-file},
+    author    = {author-from-embedded-bibtex-file},
+    journal   = {journal-from-embedded-bibtex-file},
+    year      = {2022},
+    keywords  = {keywords-from-embedded-bibtex-file, second-keyword},
+}

jablib/src/test/latex/pdfs/multiple-meta-data.tex

@@ -0,0 +1,41 @@
+% !TeX program = lualatex
+\documentclass{article}
+
+\usepackage{fontspec}
+\usepackage{hyperref}
+
+\usepackage[
+   key=multiple-meta-data,
+   year=2017,
+   publication={Anonymous et al.\ (eds). Proceedings of the International
+       Conference on LaTeX-Hacks, CEUR-WS Vol~42.},
+   startpage={1},
+   doi={10.1039/authorarchive},
+   nocopyright
+ ]{authorarchive}
+
+\hypersetup{
+    pdftitle={title-from-hyperref},
+    pdfauthor={author-from-hyperref},
+    pdfsubject={subject-from-hyperref},
+    pdfkeywords={keywords-from-hyperref, second-keyword}
+}
+
+\title{Title-from-LaTeX}
+\author{Author-from-LaTeX}
+
+\begin{document}
+
+    \begin{verbatim}
+@article{test
+    title     = {title-from-bibtex},
+    author    = {author-from-bibtex},
+    journal   = {journal-from-bibtex},
+    year      = {2023},
+    keywords  = {keywords-from-bibtex, second-keyword},
+}
+    \end{verbatim}
+    \clearpage
+    \maketitle
+    This is a \LaTeX{} document compiled with \texttt{lualatex}.
+\end{document}

jablib/src/test/resources/pdfs/README.md

@@ -1,5 +1,16 @@
-# Test PDF
+# Test PDF files
 
 This folder contains test PDFs for JabRef.
 
 In case they are generated using LaTeX, the source is available at `src/test/latex` with the same directory structure.
+
+## `multiple-meta-data.pdf`
+
+This PDF contains multiple sources for metadata:
+
+- PDF metadata
+- BibTeX code on the first page
+- Embedded file `multiple-meta-data.bib`
+- Plain text (second page)
+
+All of these sources are used to extract the "final" BibEntry.