ZCML File
testobject.zcml

<configure
    xmlns="http://namespaces.zope.org/zope"
    >
<interface
    interface=".testobject.IWorkflowData"
    />
<class
    class=".testobject.TestObject"
    >
<factory
    id="zope.app.workflow.TestObject"
    title="Test Object"
    description="Test Object"
    />
<require
    permission="zope.View"
    interface=".testobject.ITestObject"
    set_schema=".testobject.ITestObject"
    />
</class>
</configure>