added these

Author: bartsnapp

dtxTests/expandable/expandable.tex

@@ -41,6 +41,32 @@ \section{Start of Test/Demo Area}
 This is the content of the expandable environment. It can contain text, images, or any other LaTeX content.
 \end{expandable}
 
+\begin{expandable}{example}{A first example of an expandable environment.}
+    This is the content of the expandable environment. It can contain text, images, or any other LaTeX content.
+\end{expandable}
+
+
+
+\begin{expandable}{}{}
+    $
+    A^{2k} = \left[ \begin{array}{rc|rr}
+    1 & -2k & 0 & 0 \\
+    0 & 1 & 0 & 0 \\
+    \hline
+    0 & 0 & 1 & 0 \\
+    0 & 0 & 0 & 1
+    \end{array} \right]$ for $k = 0, 1, 2, \dots$
+    
+    $A^{2k + 1} = A^{2k}A = \left[ \begin{array}{rc|rr}
+    1 & -(2k + 1) & 2 & -1 \\
+    0 & 1 & 0 & 0 \\
+    \hline
+    0 & 0 & -1 & 1 \\
+    0 & 0 & 0 & 1
+    \end{array} \right]$ for $k = 0, 1, 2, \dots$
+\end{expandable}
+
+
 
 
 \hrulefill

dtxTests/image/image.tex

@@ -27,41 +27,108 @@ \section{Intended Outcome of Test}
 
 \section{Start of Test/Demo Area}
 
+
+A TikZ image in an image environment:
+\begin{image}
+    \begin{tikzpicture}
+      \begin{axis}[
+          xmin=-6.4,
+          xmax=6.4,
+          ymin=-1.2,
+          ymax=1.2,
+          axis lines=center,
+          xlabel=$x$,
+          ylabel=$y$,
+          every axis y label/.style={at=(current axis.above
+              origin),anchor=south},
+          every axis x label/.style={at=(current axis.right of
+              origin),anchor=west},
+        ]
+        \addplot [ultra thick, blue, smooth] {sin(deg(x))};
+      \end{axis}
+    \end{tikzpicture}
+  \end{image}
+
+
 %\begin{image}
 %    svg format in an image environment:
 %
 %    \includesvg{missionPatch.svg}
 %\end{image}
-\begin{image}
-    png format in an image environment:
+\hrulefill
 
+A PNG in an image environment:
+\begin{image}
     \includegraphics{missionPatch.png}
 \end{image}
-\begin{image}
-    pdf format in an image environment:
 
+\hrulefill
+
+A PDF in an image environment:
+
+\begin{image}
     \includegraphics{missionPatch.pdf}
 \end{image}
-\begin{image}
-    jpg/jpeg format in an image environment:
 
+\hrulefill
+
+A JPG format in an image environment:
+
+\begin{image}
     \includegraphics{missionPatch.jpg}
 \end{image}
 
 \hrulefill
 
-{{\bfseries \large Same Formats in the same order but No image environment below here}}
+\subsection{Repeat but in \texttt{center}}
+
+\begin{center}
+    \begin{tikzpicture}
+      \begin{axis}[
+          xmin=-6.4,
+          xmax=6.4,
+          ymin=-1.2,
+          ymax=1.2,
+          axis lines=center,
+          xlabel=$x$,
+          ylabel=$y$,
+          every axis y label/.style={at=(current axis.above
+              origin),anchor=south},
+          every axis x label/.style={at=(current axis.right of
+              origin),anchor=west},
+        ]
+        \addplot [ultra thick, blue, smooth] {sin(deg(x))};
+      \end{axis}
+    \end{tikzpicture}
+  \end{center}
+
+
+%\begin{center}
+%    svg format in an center environment:
+%
+%    \includesvg{missionPatch.svg}
+%\end{center}
+\hrulefill
+
+A PNG in an center environment:
+\begin{center}
+    \includegraphics{missionPatch.png}
+\end{center}
 
 \hrulefill
 
-%\includesvg{missionPatch.svg}
+A PDF in an center environment:
 
-\includegraphics{missionPatch.png}
+\begin{center}
+    \includegraphics{missionPatch.pdf}
+\end{center}
 
-\includegraphics{missionPatch.pdf}
+\hrulefill
 
-\includegraphics{missionPatch.jpg}
+A JPG format in an center environment:
 
+\begin{center}
+    \includegraphics{missionPatch.jpg}
+\end{center}
 
-\hrulefill
 \end{document}