[Tests] no-unused-prop-types: add passing test

Closes #1163

Author: ljharb

tests/lib/rules/no-unused-prop-types.js

@@ -6540,6 +6540,32 @@ ruleTester.run('no-unused-prop-types', rule, {
       `,
       features: ['ts', 'no-babel'],
       errors: [{ message: '\'lastname\' PropType is defined but prop is never used' }],
+    },
+
+    {
+      code: `
+        import React from "react";
+
+        var Hello = React.createClass({
+          propTypes: {
+            name: React.PropTypes.string,
+            foo: React.PropTypes.string,
+            propTypes: React.PropTypes.string
+          },
+          render: function() {
+            return <div>Hello {this.props.name}</div>;
+          }
+        });
+      `,
+      settings: {
+        react: {
+          createClass: 'createClass',
+        },
+      },
+      errors: [
+        { message: '\'foo\' PropType is defined but prop is never used' },
+        { message: '\'propTypes\' PropType is defined but prop is never used' },
+      ],
     }
   )),
 });