Function unstable_toMatchRenderedOutput

packages/jest-react/src/JestReact.js:69–98

(root, expectedJSX)

}

export function unstable_toMatchRenderedOutput(root, expectedJSX) {
  assertYieldsWereCleared(root);
  const actualJSON = root.toJSON();

  let actualJSX;
  if (actualJSON === null || typeof actualJSON === 'string') {
    actualJSX = actualJSON;
  } else if (isArray(actualJSON)) {
    if (actualJSON.length === 0) {
      actualJSX = null;
    } else if (actualJSON.length === 1) {
      actualJSX = jsonChildToJSXChild(actualJSON[0]);
    } else {
      const actualJSXChildren = jsonChildrenToJSXChildren(actualJSON);
      if (actualJSXChildren === null || typeof actualJSXChildren === 'string') {
        actualJSX = actualJSXChildren;
      } else {
        actualJSX = createJSXElementForTestComparison(REACT_FRAGMENT_TYPE, {
          children: actualJSXChildren,
        });
      }
    }
  } else {
    actualJSX = jsonChildToJSXChild(actualJSON);
  }

  return captureAssertion(() => {
    expect(actualJSX).toEqual(expectedJSX);
  });
}

function jsonChildToJSXChild(jsonChild) {
  if (jsonChild === null || typeof jsonChild === 'string') {