jest-diff-multiline-vs-oneline created by sompylasar - https://repl.it/@sompylasar/jest-diff-multiline-vs-oneline

jest-diff-multiline-vs-oneline.js

const jestDiff = require('jest-diff');  // should be [email protected]

function jestDiffAndPrint(a, b) {
	console.log(
		'----------- a:\n' +
			a +
			'\n----------- b:\n' +
			b +
			'\n----------- diff:\n' +
			jestDiff(a, b) +
			'\n-----------\n'
	);
}

jestDiffAndPrint('foo\nbar\nbaz', 'foo\n');
jestDiffAndPrint('foo\nbar\nbaz', 'foo');
jestDiffAndPrint('foo', 'foo\n');
jestDiffAndPrint('foo', 'foo\nbar');