Feature Request: toMatchExitCode

[webdeb]

To properly test contracts its necessary to check the exact exitCode thrown by the contract.
Jest only allows to match the Error message. https://jestjs.io/docs/expect#tothrowerror

[webdeb]

Created a simple implementation, would be nice if this comes into the official release, please feel free to decide about the function name.

import jestGlobal from '@jest/globals';

jestGlobal.expect.extend({
  toMatchExitCode: async (received: any, expected: number) => {
      const result = {
          message: () => `expected exitCode: ${expected}`,
          pass: false,
      }

      try {
          await received();
          result.message = () => `expected to throw Error with exitCode: ${expected}, no Error was thrown instead`
      } catch(e: any) {
          result.pass = e.exitCode == expected;
      }

      return result
  }
});

declare global {
  export namespace jest {
      interface Matchers<R> {
          toMatchExitCode(code: number): R
      }
  }
}

Usage:

expect(async () => await someContract.sendSmt()).toMatchExitCode(123);