@microsoft/sarif-matcher-utils

Custom matchers for SARIF logs for Jest

Overview

The Static Analysis Result Interchange Format (SARIF) is comprehensive spec that provides a standardized schema for tools running static analysis. For tools producing SARIF output, it's useful to be able to test that output to validate it conforms to the SARIF JSON schema.

This library helps achieve that through a custom matcher utility, which allows for assertion extensions for popular test libraries such as jest and vitest. It uses the SARIF JSON Schema to validate the log structure against the actual schema, which helps ensure flexibility when matching whole or partial portions of that schema.

Installation

npm install @microsoft/sarif-matcher-utils --save-dev

# or

yarn add @microsoft/sarif-matcher-utils -D

Usage

The main API is the buildMatcher function, which can be used to extend the jest or vitest matcher API with custom assertions. The example below demonstrates using the buildMatcher function to extend the vitest matcher API with custom assertions.

Using JavaScript:

// sarif-log-matcher.ts
import { expect } from 'vitest';
import { buildMatcher } from '@microsoft/sarif-matcher-utils';

const toBeValidSarifLog = buildMatcher();

expect.extend({ toBeValidSarifLog });

Using TypeScript, which includes necessary type extensions for vitest:

// sarif-log-matcher.ts
import { expect } from 'vitest';
import * as Sarif from 'sarif';
import { buildMatcher } from '@microsoft/sarif-matcher-utils';

type MaybeSarifLog = Sarif.Log | unknown;

interface CustomMatchers<R = unknown> {
  toBeValidSarifLog(): R;
}

declare global {
  namespace Vi {
    interface Assertion extends CustomMatchers {}
    interface AsymmetricMatchersContaining extends CustomMatchers {}
  }
}

const toBeValidSarifLog = buildMatcher<MaybeSarifLog>();

expect.extend({ toBeValidSarifLog });

Which can then be used in tests:

import './sarif-log-matcher';

it('should be a valid SARIF log', () => {
  const sarifLog = buildSarifLog();

  expect(sarifLog).toBeValidSarifLog();
});

Attribution

This package was based on the jest-json-schema package.

Contributing

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

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This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact [e-mail] with any additional questions or comments.

Trademarks

This project may contain trademarks or logos for projects, products, or services. Authorized use of Microsoft trademarks or logos is subject to and must follow Microsoft's Trademark & Brand Guidelines. Use of Microsoft trademarks or logos in modified versions of this project must not cause confusion or imply Microsoft sponsorship. Any use of third-party trademarks or logos are subject to those third-party's policies.