[svg2xml] Add tests to valid issue 24 (of upstream repo) (#32)

This validate the fix of StringIndexOutOfBoundsException previously thrown when doing SVG average gradient color computation.

Author: tbouffard

README.md

@@ -20,7 +20,7 @@ It contains the original `svg2xml` tool; it aims to improve it and to add the fo
 easy integration in JS programs
 - add [svg2js](#svg2js): convert an SVG file into a set of `mxGraph` JavaScript/TypeScript commands
 
-**NOTE**: The main purpose of this repository is to provide the svg2js tool and to use it when developing [bpmn-visualization](https://https://github.com/process-analytics/bpmn-visualization-js).
+**NOTE**: The main purpose of this repository is to provide the `svg2js` tool and to use it when developing [bpmn-visualization](https://https://github.com/process-analytics/bpmn-visualization-js).
 
 ## Build
 

src/test/java/com/mxgraph/svg2xml/Svg2XmlTest.java

@@ -78,4 +78,11 @@ void convertToXml_files_from_two_folders_without_subfolders_files_given_ordered_
         );
     }
 
-}
+    @Test
+    void issue_upstream_24() {
+        Svg2Xml svg2Xml = newSvg2Xml();
+        File destPath = destinationFolder("upstream_issue_24");
+        svg2Xml.convertToXml(svgSourceFiles("upstream-issue-24/entry.svg"), destPath);
+    }
+
+}