DefinitelyTyped/types/jest-json-schema/jest-json-schema-tests.ts

import { matchersWithOptions } from 'jest-json-schema';

expect.extend(
    matchersWithOptions(
        {
            formats: {
                test: /^test$/,
            },
        },
        ajv => {
            ajv.addKeyword('test', {
                validate: (schema: any, data: string) => {
                    return schema && data === 'test';
                },
                metaSchema: {
                    type: 'boolean',
                },
            });
        },
    ),
);

it('validates schema', () => {
    expect({
        test: true,
        format: 'test',
    }).toBeValidSchema();
});

it('schema matches data', () => {
    const schema = {
        properties: {
            hello: { type: 'string' },
            test: {
                test: true,
                format: 'test',
            },
        },
        required: ['hello'],
    };
    expect({ hello: 'world', test: 'test' }).toMatchSchema(schema);
});