6c5a150b81
* Ignore classnames during jest snapshot comparison * Replace by simple placeholder * Update snapshots
33 lines
1.0 KiB
JavaScript
33 lines
1.0 KiB
JavaScript
import { prettyDOM } from "@testing-library/react";
|
|
|
|
/**
|
|
* Traverse a tree of nodes and replace all class names with
|
|
* the count of classnames instead, e.g. "<3 classnames>"
|
|
*/
|
|
const traverseAndRedactClasses = (node) => {
|
|
if (node.className && typeof node.className === "string") {
|
|
node.className = `<removed-for-snapshot-test>`;
|
|
}
|
|
node.childNodes.forEach(traverseAndRedactClasses);
|
|
};
|
|
|
|
module.exports = {
|
|
serialize(val, config) {
|
|
// Clone the whole rendered DOM tree, since we're modifying it
|
|
const clone = val.baseElement.cloneNode(true);
|
|
// Redact all classnames
|
|
traverseAndRedactClasses(clone);
|
|
// Use prettyDOM to format the modified DOM as a string.
|
|
return prettyDOM(clone, Infinity, {
|
|
indent: config.indent.length,
|
|
highlight: false,
|
|
});
|
|
},
|
|
|
|
test(val) {
|
|
// Only use this serializer when creating a snapshot of RenderResult, which is
|
|
// the return value of testing-library/react's render method.
|
|
return val && val.baseElement && val.baseElement instanceof Element;
|
|
},
|
|
};
|