eslint-config-ao/test/utils.js

AO ESLint config

// Use commonjs rather than es6 imports so it can be used from other modules.
// const { CLIEngine } = require('eslint');
const eslintConsts = require('../rules/eslint-consts');
const path = require('path');
const fs = require('fs');

const OFF = eslintConsts.LEVEL_LOOKUP[eslintConsts.OFF];
const WARN = eslintConsts.LEVEL_LOOKUP[eslintConsts.WARN];
const ERROR = eslintConsts.LEVEL_LOOKUP[eslintConsts.ERROR];

/**
 * Creates a linter
 *
 * @see http://eslint.org/docs/developer-guide/nodejs-api.html#executeonfiles
 * @see http://eslint.org/docs/developer-guide/nodejs-api.html#executeontext
 * @param {Function} CLIEngine CLIEngine to help eslint find plugins relative to package this is run from.
 * @param {*} eslintrc Base eslint to use
 * @param {*} disableRules a list of specify rules to disable
 */
function createLinter(CLIEngine, eslintrc, disableRules = []){
	const config = {
		useEslintrc: false,
		baseConfig: eslintrc,

		rules: disableRules.reduce(function(acc, rule) {
			acc[rule] = OFF;
			return acc;
		}, {})

	};

	const cli = new CLIEngine(config);

	return function(text){
		const linter = cli.executeOnText(text);
		return linter.results[0];
	};
}

function testCounts(expected, count, results, severity) {
	if (typeof expected == 'number') {
		expect(count).toBe(expected);
	} else if (typeof expected == 'object') {
		var errorCounts = results.messages.filter(m => m.severity === severity).reduce((acc, { ruleId }) => {
			if (acc.hasOwnProperty(ruleId)) {
				acc[ruleId] += 1;
			} else {
				acc[ruleId] = 1;
			}
			return acc;
		}, {});

		expect(errorCounts).toEqual(expected);
	}
}

function testCase(CLIEngine, eslintrc, rootPath = __dirname) {
	return function(t){
		const text = fs.readFileSync(path.resolve(rootPath, t.file)).toString();
		const lint = createLinter(CLIEngine, eslintrc, t.disableRules);
		const results = lint(text);
		try {

			testCounts(t.warnings, results.warningCount, results, WARN);
			testCounts(t.errors, results.errorCount, results, ERROR);
		} catch (e) {
			// eslint-disable-next-line no-console
			// console.log(results);
			throw e;
		}
	};
}

module.exports = {
	createLinter,
	testCounts,
	testCase
};