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

Eslint rules for Jest

'use strict';

const _require = require('./util'),
      getDocsUrl = _require.getDocsUrl,
      expectCase = _require.expectCase,
      expectNotCase = _require.expectNotCase,
      expectResolveCase = _require.expectResolveCase,
      expectRejectCase = _require.expectRejectCase,
      method = _require.method;

module.exports = {
  meta: {
    docs: {
      url: getDocsUrl(__filename)
    },
    messages: {
      useToHaveLength: 'Use toHaveLength() instead'
    },
    fixable: 'code'
  },

  create(context) {
    return {
      CallExpression(node) {
        if (!(expectNotCase(node) || expectResolveCase(node) || expectRejectCase(node)) && expectCase(node) && (method(node).name === 'toBe' || method(node).name === 'toEqual') && node.arguments[0].property && node.arguments[0].property.name === 'length') {
          const propertyDot = context.getSourceCode().getFirstTokenBetween(node.arguments[0].object, node.arguments[0].property, token => token.value === '.');
          context.report({
            fix(fixer) {
              return [fixer.remove(propertyDot), fixer.remove(node.arguments[0].property), fixer.replaceText(method(node), 'toHaveLength')];
            },

            messageId: 'useToHaveLength',
            node: method(node)
          });
        }
      }

    };
  }

};