How to test React template block in a component - reactjs

Question

I am trying to test a little React component - Template block statement.
But do I can to do that? Because I can't even log that block statement from renderResult() method.
Is it possible? Only One way I see. It's just test the end result via Enzume Shallow. But I just wonder - is it possible?
Thanks for any info.
import React, { PropTypes } from "react";
export function zeta() {
return "zeta";
}
export default class AppComponent extends React.Component {
some() {
return "some";
}
renderResult() {
let res;
if (process.env.NODE_ENV === "production") {
res = ( <main><h1>App Component PROD</h1>{ this.props.children }</main> );
} else {
res = ( <main><h1>App Component DEV 11</h1>{ this.props.children }</main> );
}
return res;
}
render() {
return this.renderResult();
}
}
AppComponent.propTypes = {
children : PropTypes.object
};
My test
import jasmineEnzyme from "jasmine-enzyme";
import React from "react";
import {mount} from "enzyme";
import AppComponent, {zeta} from "../App.component";
describe("<AppComponent /> test", () => {
let wrapper;
beforeEach(() => {
jasmineEnzyme();
wrapper = mount(<AppComponent />);
});
it("App Component should contain h1", () => {
expect(wrapper.find("h1")).toBePresent();
});
it("h1 Should contain a dev text in case of dev mode", () => {
const compInst = wrapper.instance();
const res = compInst.some();
console.log(compInst.renderResult());
console.log(res);
expect(res).toMatch("some");
});
});
});