expect
extension to use Jest'stoMatchSnapshot
in Mocha
The module uses jest-snapshot
under the hood and works as an extension to [email protected]
to enable snapshot-testing in mocha
.
All credit goes to Alexander Beletsky. See his blog post about snapshot-testing in Mocha here.
const expect = require("expect");
const toMatchSnapshot = require("expect-mocha-snapshot");
expect.extend({ toMatchSnapshot });
describe("foo", function() {
it("matches the snapshot", function() {
expect({ foo: "bar" }).toMatchSnapshot(this);
});
});
To create the snapshot or test the code against the created snapshots, just run mocha
like you normally would.
mocha
If your tests are failing and you want to update the snapshot, use the environment variable SNAPSHOT_UPDATE
.
SNAPSHOT_UPDATE=true mocha
MIT