I broke up with neovim....vim is my best friend now

dot_vim/plugged/vimtex/test/test-syntax/test-amsthm.tex

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+\documentclass{article}
+\usepackage{amsthm}
+
+\theoremstyle{plain}
+\newtheorem{thm}{Theorem}[section]
+\newtheorem{prp}[thm]{Proposition}
+\newtheorem{lemma}{Lemma}
+
+\begin{document}
+
+\begin{thm}[description of theorem abc \cite{abc}]
+  My theorem goes here.
+\end{thm}
+
+\begin{prp}[pleaze spelll check]
+  My proposition goes here.
+\end{prp}
+
+\begin{lemma}
+  A lemma here.
+\end{lemma}
+
+\begin{proof}[Proof of theorem abc]
+    Proof goes here.
+\end{proof}
+
+\end{document}