eslint-plugin-jest/lib/rules/__tests__/prefer-to-have-length.test.js

Eslint rules for Jest

'use strict';

const _require = require('eslint'),
      RuleTester = _require.RuleTester;

const rule = require('../prefer-to-have-length');

const ruleTester = new RuleTester();
ruleTester.run('prefer-to-have-length', rule, {
  valid: ['expect(files).toHaveLength(1);', "expect(files.name).toBe('file');", 'expect(result).toBe(true);', `expect(user.getUserName(5)).resolves.toEqual('Paul')`, `expect(user.getUserName(5)).rejects.toEqual('Paul')`],
  invalid: [{
    code: 'expect(files.length).toBe(1);',
    errors: [{
      messageId: 'useToHaveLength',
      column: 22,
      line: 1
    }],
    output: 'expect(files).toHaveLength(1);'
  }, {
    code: 'expect(files.length).toEqual(1);',
    errors: [{
      messageId: 'useToHaveLength',
      column: 22,
      line: 1
    }],
    output: 'expect(files).toHaveLength(1);'
  }]
});