AJV + Jest - gits #5

meaningful-message-custom-matcher.js

expect.extend({
  toBeValid(isValid, errorMessage) {
    return {
      message: () => isValid ? '' : errorMessage,
      pass: isValid
    }
  }
});

it(`should user's schema be valid`, () => {
  const shema = {
    "type": "array",
    "items": {
      "type": "object",
      "properties": {
        "fullname": {
          "type": "string",
          "minLength": 2
        },
      },
    },
  };

  const valid = ajv.validate(shema, [
    {
      fullname: 'a'
    }
  ]);
  try {
      const [, index, fieldName] = /\[(.*)\].(.*)/.exec(error.dataPath);
      return `error with item #${index}'s field "${fieldName}". The error is: ${error.message}`;
    } catch (error) {
      return error.message;
    }
  }).join('\n');
  expect(valid).toBeValid(errorMessage);
});

Hi. You missed const errorMessage = (ajv.errors || []).map(error => { after 28 line.