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I'm making the switch from using enzyme to react-testing-library for testing my components.

I have a simple component CustomModal which acts much like a wrapper around the Modal from reactstrap. I am trying to test that my CustomModal includes the child elements that it ought to.

Taking my cues from this article and this article, I am adding data-testid attributes to my children, and then I am using getByTestId and queryByTestId. But, for some reason, my queries are not finding the child nodes that, as far as I can tell, are there.

Is there something I am doing wrong in my test setup, or am I misunderstanding how react-testing-library should be used?

The basic code, along with the test (which is failing), can be found in this CodeSandbox:

My basic CustomModal component looks like this:

/*
 * src/components/CustomModal/index.js
 */

import React from "react";
import Button, Modal, ModalHeader, ModalBody, ModalFooter from "reactstrap";

const getSanitizedModalProps = props => 
 let modalProps = ...props ;
 delete modalProps.onConfirm;
 delete modalProps.onCancel;
 delete modalProps.headerText;
 delete modalProps.children;
 modalProps.isOpen = modalProps.isOpen === true;
 return modalProps;
;

export default props => 
 return (
 <Modal data-testid="modal" ...getSanitizedModalProps(props)>
 <ModalHeader data-testid="modal-header">props.headerText</ModalHeader>
 <ModalBody data-testid="modal-body">props.children</ModalBody>
 <ModalFooter data-testid="modal-footer">
 <Button data-testid="confirm-button" onClick=props.onConfirm>
 Confirm
 </Button>
 <Button data-testid="cancel-button" onClick=props.onCancel>
 Cancel
 </Button>
 </ModalFooter>
 </Modal>
 );
;

My test file looks like this:

/*
 * src/components/CustomModal/CustomModal.test.js
 */

import React from "react";
import render from "react-testing-library";
import CustomModal from "./index";

const TEST_IDS = 
 modal: "modal",
 header: "modal-header",
 body: "modal-body",
 footer: "modal-footer",
 cancel: "cancel-button",
 confirm: "confirm-button"
;

describe("<Modal />", () => 
 const headerText = "hello world";
 it("renders all of the children", () => 
 const queryByTestId = render(<CustomModal headerText=headerText />);

 // The following assertions all fail
 expect(queryByTestId(TEST_IDS.modal)).toBeTruthy(); 
 expect(queryByTestId(TEST_IDS.header)).toBeTruthy();
 expect(queryByTestId(TEST_IDS.body)).toBeTruthy();
 expect(queryByTestId(TEST_IDS.footer)).toBeTruthy();
 expect(queryByTestId(TEST_IDS.cancel)).toBeTruthy();
 expect(queryByTestId(TEST_IDS.confirm)).toBeTruthy();
 );
);

Your modal is closed, you need to pass isOpen to it:

render(<CustomModal headerText=headerText isOpen />);