TestContextAssert.snapshot method | Node.js node:test module | Bun

This function implements assertions for snapshot testing.

test('snapshot test with default serialization', (t) => {
t.assert.snapshot({ value1: 1, value2: 2 });
});

test('snapshot test with custom serialization', (t) => {
t.assert.snapshot({ value3: 3, value4: 4 }, {
serializers: [(value) => JSON.stringify(value)]
});
});

A value to serialize to a string. If Node.js was started with the --test-update-snapshots flag, the serialized value is written to the snapshot file. Otherwise, the serialized value is compared to the corresponding value in the existing snapshot file.