AssertionError 'import' is reserved when writing tests for custom eslint rule - eslint

Question

The custom eslint rule runs ok in our project, but I cannot figure out how to run tests for it. My guess is that I am running wrong version of ecmascript and I need to use babel or adjust something in eslintrc.json to make this work with the mocha scripts.
Getting error message:
AssertionError [ERR_ASSERTION]: A fatal parsing error occurred: Parsing error: The keyword 'import' is reserved
The test:
/**
* #fileoverview Prohibit import underscore to help tree
* #author Jason Hocker
*/
"use strict";
//------------------------------------------------------------------------------
// Requirements
//------------------------------------------------------------------------------
var rule = require("../../../lib/rules/no-full-lodash-import"),
RuleTester = require("eslint").RuleTester;
//------------------------------------------------------------------------------
// Tests
//------------------------------------------------------------------------------
var ruleTester = new RuleTester();
ruleTester.run("no-full-lodash-import", rule, {
valid: [
{code: "import os from \"os\";\nimport fs from \"fs\";" },
{code: "import { merge } from \"lodash-es\";"}
],
invalid: [
{
code: "import _ from 'lodash';",
errors: [{
message: "Fill me in.",
type: "Me too"
}]
}
]
});
One of the .jslintrc.json files I tried:
{
"env": {
"browser": true,
"es6": true,
"mocha": true // add mocha as true to your ".eslintrc. *" file
},
"parserOptions": {
"ecmaVersion": 6,
"sourceType": "module",
"ecmaFeatures": {
"jsx": true
}
},
"rules": {
"semi": "error"
}
}

Answer 1

ESLint docs suggest that you can pass a configuration object to the RuleTester constructor.
In your case it should probably look like this:
var config = {
env: {
browser: true,
es6: true,
mocha: true, // add mocha as true to your ".eslintrc. *" file
},
parserOptions: {
ecmaVersion: 6,
sourceType: 'module',
ecmaFeatures: {
jsx: true,
},
},
}
var ruleTester = new RuleTester()