Update combine_ways.test.js

Author: Beakerboy

test/combine_ways.test.js

@@ -82,6 +82,12 @@ describe.each([
       '<way id="3"><nd ref="3"/><nd ref="4"/><nd ref="1"/></way>',
     ], 1, 5, 'Dealing with amiguity. Only make one closed way',
   ],
+  [
+    [
+      '<way id="1"><nd ref="1"/><nd ref="2"/><nd ref="3"/></way>',
+      '<way id="2"><nd ref="3"/><nd ref="4"/><nd ref="2"/><nd ref="5"/><nd ref="1"/></way>',
+    ], 0, 0, 'Closed way is self intersecting',
+  ],
 ])('Combine Ways', (ways, length, nodes, description) => {
   test(`${description}`, () => {
     let parser = new window.DOMParser();