Add test

packages/rebber/__tests__/fixtures/mix-2.expected.tex

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+(for convenience,   are replaced with simple single spaces in the tests)
+
+\chapter{first 1}
+
+\begin{Quotation}{Quotation Source}
+
+Code inside quote
+
+\begin{codeBlock}[code source]{python}
+print('bla')
+\end{codeBlock}
+\end{Quotation}
+
+\begin{codeBlock}[First]{python}
+print('bla')
+\end{codeBlock}
+
+Code: Second
+
+\begin{codeBlock}{python}
+print('code without caption')
+\end{codeBlock}

packages/rebber/__tests__/fixtures/mix-2.fixture.md

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+(for convenience, · are replaced with simple single spaces in the tests)
+# first 1
+
+> Code inside quote
+> ```python
+> print('bla')
+> ```
+> Code: code source
+Source: Quotation Source
+
+```python
+print('bla')
+```
+Code: First
+Code: Second
+
+```python
+print('code without caption')
+```