Add symbol tests for A WITH RING ABOVE

The conversion is not completely correct yet, but adding the test before the
fix has the advantage that the fix can easily be documented by changing the
test reference.

src/tex2lyx/test/test-insets.lyx.lyx

@@ -6902,6 +6902,36 @@ TIPA code in math:
 
 \end_layout
 
+\begin_layout Subsection
+Other symbols
+\end_layout
+
+\begin_layout Standard
+All three should be converted to U+00C5: Å Å Å (not U+212B). All three should be converted to U+00E5: 
+\begin_inset ERT
+status collapsed
+
+\begin_layout Plain Layout
+
+\backslash
+aa
+\end_layout
+
+\end_inset
+
+
+\begin_inset ERT
+status collapsed
+
+\begin_layout Plain Layout
+{}
+\end_layout
+
+\end_inset
+
+ å å.
+\end_layout
+
 \begin_layout Subsection
 Line breaks
 \begin_inset Index breaks

src/tex2lyx/test/test-insets.tex

@@ -639,6 +639,10 @@ e\textcorner{}
 TIPA code in math:
 $\textipa{\tone{55}|\text{\!b{}\!d{}\!g{}\!G{}\textglobfall{}\textvertline{}\textdoublevertline{}}}$
 
+\subsection{Other symbols}
+All three should be converted to U+00C5: \AA{} \r A \r{A} (not U+212B).
+All three should be converted to U+00E5: \aa{} \r a \r{a}.
+
 \subsection{Line breaks\sindex[breaks]{Line breaks}}
 
 They can also or be broken by a newline\\