fixed all the tests

Signed-off-by: Peter Staar <[email protected]>

Author: PeterStaar-IBM

docling_core/transforms/serializer/latex.py

@@ -656,7 +656,9 @@ def serialize_doc(
         # Build optional preamble
         preamble_lines: list[str] = []
         if params.document_class:
-            preamble_lines.append(params.document_class + "\n")
+            # Add document class and a blank line after it
+            preamble_lines.append(params.document_class)
+            preamble_lines.append("")
         for pkg in params.packages:
             line = pkg.strip()
             if not line:
@@ -671,7 +673,7 @@ def serialize_doc(
             preamble_lines.append(title_cmd)
 
         header = (
-            "\n".join(preamble_lines + ["\n\\begin{document}"])
+            "\n".join(preamble_lines + ["", "\\begin{document}"])
             if preamble_lines
             else "\\begin{document}"
         )

test/data/doc/inline_and_formatting.gt.tex

@@ -45,6 +45,12 @@ \section{\textit{Partially formatted} heading to\_escape \texttt{not_to_escape}
 
 \textit{Partially formatted} heading to\_escape \texttt{not_to_escape} $E=mc^2$ \& ampersand
 
+A hyperlink on \texttt{code in a line}
+
+\begin{verbatim}
+A hyperlink on code as paragraph
+\end{verbatim}
+
 The end.
 
 \end{document}

test/test_latex_serialization.py

@@ -13,8 +13,6 @@
 from docling_core.types.doc.base import ImageRefMode
 from docling_core.types.doc.document import DoclingDocument
 
-from .conftest import _construct_doc
-from .conftest import _rich_table_doc as _construct_rich_table_doc
 from .test_data_gen_flag import GEN_TEST_DATA
 
 
@@ -81,8 +79,8 @@ def test_dummy_doc():
     verify_or_update(exp_file=src.with_suffix(".gt.tex"), actual=actual)
 
 
-def test_constructed_doc():
-    doc = _construct_doc()
+def test_constructed_doc(sample_doc: DoclingDocument):
+    doc = sample_doc
 
     ser = LaTeXDocSerializer(
         doc=doc,
@@ -96,8 +94,8 @@ def test_constructed_doc():
     verify_or_update(exp_file=src.with_suffix(".gt.tex"), actual=actual)
 
 
-def test_constructed_rich_table_doc():
-    doc = _construct_rich_table_doc()
+def test_constructed_rich_table_doc(rich_table_doc: DoclingDocument):
+    doc = rich_table_doc
 
     ser = LaTeXDocSerializer(
         doc=doc,