@uifabric/utilities/lib/test/setRenderSpy.js

Fluent UI React utilities for building components.

import * as sinon from 'sinon';
/**
 * Replaces the enzyme render function with a spy that can be used to count how many
 * times the render function was called in a test.
 * @param wrapper - The wrapper around the component instance for which you want to spy upon
 */
export function setRenderSpy(wrapper) {
    var spy = sinon.spy(wrapper.instance().render);
    wrapper.instance().render = spy;
    return spy;
}
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