eslint-plugin-jest/lib/processors/__tests__/snapshot-processor.test.js

Eslint rules for Jest

'use strict';

const snapshotProcessor = require('../snapshot-processor');

describe('snapshot-processor', () => {
  it('exports an object with preprocess and postprocess functions', () => {
    expect(snapshotProcessor).toMatchObject({
      preprocess: expect.any(Function),
      postprocess: expect.any(Function)
    });
  });
  describe('preprocess function', () => {
    it('should pass on untouched source code to source array', () => {
      const preprocess = snapshotProcessor.preprocess;
      const sourceCode = "const name = 'johnny bravo';";
      const result = preprocess(sourceCode);
      expect(result).toEqual([sourceCode]);
    });
  });
  describe('postprocess function', () => {
    it('should only return messages about snapshot specific rules', () => {
      const postprocess = snapshotProcessor.postprocess;
      const result = postprocess([[{
        ruleId: 'no-console'
      }, {
        ruleId: 'global-require'
      }, {
        ruleId: 'jest/no-large-snapshots'
      }]]);
      expect(result).toEqual([{
        ruleId: 'jest/no-large-snapshots'
      }]);
    });
  });
});