test(import): verify duplicate id behavior

test/fixtures/bpmn/error/duplicate-ids.bpmn

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<bpmn2:definitions
+  xmlns:bpmn2="http://www.omg.org/spec/BPMN/20100524/MODEL"
+  xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
+  id="definitions"
+  targetNamespace="http://bpmn.io/schema/bpmn">
+
+  <bpmn2:process id="test" />
+  <bpmn2:process id="test" />
+
+  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
+    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="test">
+    </bpmndi:BPMNPlane>
+  </bpmndi:BPMNDiagram>
+</bpmn2:definitions>

test/spec/ViewerSpec.js

@@ -230,6 +230,25 @@ describe('Viewer', function() {
       });
     });
 
+
+    it('should handle duplicate ids', function(done) {
+
+      var xml = require('../fixtures/bpmn/error/duplicate-ids.bpmn');
+
+      // when
+      createViewer(xml, function(err, warnings) {
+
+        // then
+        expect(err).not.to.exist;
+
+        expectWarnings(warnings, [
+          /duplicate ID <test>/
+        ]);
+
+        done();
+      });
+    });
+
   });