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diff --git a/testing/022_dot.cpp b/testing/022_dot.cpp
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+// objective: test the \dot and \enddot commands
+// check: indexpage.xml
+// config: HAVE_DOT = YES
+// config: DOTFILE_DIRS = .
+
+/*! class B */
+class B {};
+/*! class C */
+class C {};
+
+/*! \mainpage
+Class relations expressed via an inline dot graph:
+\dot
+digraph example {
+ node [shape=record, fontname=Helvetica, fontsize=10];
+ b [ label="class B" URL="\ref B"];
+ c [ label="class C" URL="\ref C"];
+ b -> c [ arrowhead="open", style="dashed" ];
+}
+\enddot
+*/
+