cairo_diagram: save a file when generating the test diagram

diff --git a/src/diagram/cairo_diagram.py b/src/diagram/cairo_diagram.py
index bf35d59..122ee24 100755 (executable)
--- a/src/diagram/cairo_diagram.py
+++ b/src/diagram/cairo_diagram.py
@@ -211,6 +211,7 @@ def test():
     Diagram.test(diagram)
 
     diagram.show()
+    diagram.save_svg('cairo_diagram_test.svg')
 
 
 if __name__ == "__main__":