Forgot a test.

test/spec/IOInterceptorSpec.js

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+import { bootstrapPropertiesPanel } from './helpers';
+import dataObjectInterceptor from '../../app/spiffworkflow/DataObject';
+import { BpmnPropertiesPanelModule, BpmnPropertiesProviderModule } from 'bpmn-js-properties-panel';
+import {
+  inject,
+} from 'bpmn-js/test/helper';
+import { findDataObjects } from '../../app/spiffworkflow/DataObject/DataObjectHelpers';
+import IoInterceptor from '../../app/spiffworkflow/InputOutput/IoInterceptor';
+import InputOutput from '../../app/spiffworkflow/InputOutput';
+
+describe('Input/Output Interceptor', function() {
+
+  let xml = require('./bpmn/empty_diagram.bpmn').default;
+
+  beforeEach(bootstrapPropertiesPanel(xml, {
+    debounceInput: false,
+    additionalModules: [
+      InputOutput,
+      BpmnPropertiesPanelModule,
+      BpmnPropertiesProviderModule,
+    ]
+  }));
+
+  it('New Data Input should create an IOSpecification with a single dataInput object', inject(function(canvas, modeling) {
+
+    expect(canvas.getRootElement().businessObject.ioSpecification).to.be.undefined;
+
+    // IF - a new dataObjectReference is created
+    let rootShape = canvas.getRootElement();
+    const dataInput = modeling.createShape({ type: 'bpmn:DataInput' },
+      { x: 220, y: 220 }, rootShape);
+
+    // THEN - the process should now have an IO Specification
+    const iospec = canvas.getRootElement().businessObject.ioSpecification;
+    expect(iospec).to.not.be.null;
+    expect(iospec.dataInputs.length).to.equal(1)
+  }));
+
+
+  it('IOSpecification always contain input sets and output sets if they exist at all.', inject(function(canvas, modeling) {
+
+    expect(canvas.getRootElement().businessObject.ioSpecification).to.be.undefined;
+
+    // IF - a new dataObjectReference is created
+    let rootShape = canvas.getRootElement();
+    const dataInput = modeling.createShape({type: 'bpmn:DataInput'},
+      {x: 220, y: 220}, rootShape);
+
+    // THEN - there are inputSets and outputSets
+    const iospec = canvas.getRootElement().businessObject.ioSpecification;
+    expect(iospec.inputSets).to.not.be.null;
+    expect(iospec.outputSets).to.not.be.null;
+  }));
+
+    it('After removing all input sets, the ioSpecification should be null.', inject(function(canvas, modeling) {
+    // IF - a new dataObjectReference is created and then deleted.
+    let rootShape = canvas.getRootElement();
+    const dataInput = modeling.createShape({type: 'bpmn:DataInput'},
+      {x: 220, y: 220}, rootShape);
+    modeling.removeShape(dataInput)
+    expect(canvas.getRootElement().businessObject.ioSpecification).to.be.null;
+  }));
+});