681 lines
26 KiB
JavaScript
681 lines
26 KiB
JavaScript
/**
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* @fileoverview Mocha test wrapper
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* @author Ilya Volodin
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*/
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"use strict";
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/* global describe, it */
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/*
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* This is a wrapper around mocha to allow for DRY unittests for eslint
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* Format:
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* RuleTester.run("{ruleName}", {
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* valid: [
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* "{code}",
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* { code: "{code}", options: {options}, globals: {globals}, parser: "{parser}", settings: {settings} }
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* ],
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* invalid: [
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* { code: "{code}", errors: {numErrors} },
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* { code: "{code}", errors: ["{errorMessage}"] },
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* { code: "{code}", options: {options}, globals: {globals}, parser: "{parser}", settings: {settings}, errors: [{ message: "{errorMessage}", type: "{errorNodeType}"}] }
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* ]
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* });
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*
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* Variables:
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* {code} - String that represents the code to be tested
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* {options} - Arguments that are passed to the configurable rules.
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* {globals} - An object representing a list of variables that are
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* registered as globals
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* {parser} - String representing the parser to use
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* {settings} - An object representing global settings for all rules
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* {numErrors} - If failing case doesn't need to check error message,
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* this integer will specify how many errors should be
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* received
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* {errorMessage} - Message that is returned by the rule on failure
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* {errorNodeType} - AST node type that is returned by they rule as
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* a cause of the failure.
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*/
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//------------------------------------------------------------------------------
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// Requirements
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//------------------------------------------------------------------------------
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const
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assert = require("assert"),
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path = require("path"),
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util = require("util"),
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lodash = require("lodash"),
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{ getRuleOptionsSchema, validate } = require("../shared/config-validator"),
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{ Linter, SourceCodeFixer, interpolate } = require("../linter");
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const ajv = require("../shared/ajv")({ strictDefaults: true });
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//------------------------------------------------------------------------------
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// Private Members
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//------------------------------------------------------------------------------
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/*
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* testerDefaultConfig must not be modified as it allows to reset the tester to
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* the initial default configuration
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*/
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const testerDefaultConfig = { rules: {} };
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let defaultConfig = { rules: {} };
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/*
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* List every parameters possible on a test case that are not related to eslint
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* configuration
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*/
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const RuleTesterParameters = [
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"code",
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"filename",
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"options",
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"errors",
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"output"
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];
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const hasOwnProperty = Function.call.bind(Object.hasOwnProperty);
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/**
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* Clones a given value deeply.
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* Note: This ignores `parent` property.
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* @param {any} x A value to clone.
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* @returns {any} A cloned value.
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*/
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function cloneDeeplyExcludesParent(x) {
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if (typeof x === "object" && x !== null) {
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if (Array.isArray(x)) {
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return x.map(cloneDeeplyExcludesParent);
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}
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const retv = {};
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for (const key in x) {
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if (key !== "parent" && hasOwnProperty(x, key)) {
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retv[key] = cloneDeeplyExcludesParent(x[key]);
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}
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}
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return retv;
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}
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return x;
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}
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/**
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* Freezes a given value deeply.
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* @param {any} x A value to freeze.
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* @returns {void}
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*/
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function freezeDeeply(x) {
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if (typeof x === "object" && x !== null) {
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if (Array.isArray(x)) {
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x.forEach(freezeDeeply);
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} else {
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for (const key in x) {
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if (key !== "parent" && hasOwnProperty(x, key)) {
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freezeDeeply(x[key]);
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}
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}
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}
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Object.freeze(x);
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}
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}
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/**
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* Replace control characters by `\u00xx` form.
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* @param {string} text The text to sanitize.
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* @returns {string} The sanitized text.
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*/
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function sanitize(text) {
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return text.replace(
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/[\u0000-\u0009|\u000b-\u001a]/gu, // eslint-disable-line no-control-regex
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c => `\\u${c.codePointAt(0).toString(16).padStart(4, "0")}`
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);
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}
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//------------------------------------------------------------------------------
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// Public Interface
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//------------------------------------------------------------------------------
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// default separators for testing
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const DESCRIBE = Symbol("describe");
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const IT = Symbol("it");
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/**
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* This is `it` default handler if `it` don't exist.
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* @this {Mocha}
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* @param {string} text The description of the test case.
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* @param {Function} method The logic of the test case.
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* @returns {any} Returned value of `method`.
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*/
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function itDefaultHandler(text, method) {
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try {
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return method.call(this);
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} catch (err) {
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if (err instanceof assert.AssertionError) {
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err.message += ` (${util.inspect(err.actual)} ${err.operator} ${util.inspect(err.expected)})`;
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}
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throw err;
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}
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}
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/**
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* This is `describe` default handler if `describe` don't exist.
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* @this {Mocha}
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* @param {string} text The description of the test case.
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* @param {Function} method The logic of the test case.
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* @returns {any} Returned value of `method`.
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*/
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function describeDefaultHandler(text, method) {
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return method.call(this);
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}
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class RuleTester {
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/**
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* Creates a new instance of RuleTester.
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* @param {Object} [testerConfig] Optional, extra configuration for the tester
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*/
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constructor(testerConfig) {
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/**
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* The configuration to use for this tester. Combination of the tester
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* configuration and the default configuration.
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* @type {Object}
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*/
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this.testerConfig = lodash.merge(
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// we have to clone because merge uses the first argument for recipient
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lodash.cloneDeep(defaultConfig),
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testerConfig,
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{ rules: { "rule-tester/validate-ast": "error" } }
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);
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/**
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* Rule definitions to define before tests.
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* @type {Object}
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*/
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this.rules = {};
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this.linter = new Linter();
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}
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/**
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* Set the configuration to use for all future tests
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* @param {Object} config the configuration to use.
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* @returns {void}
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*/
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static setDefaultConfig(config) {
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if (typeof config !== "object") {
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throw new TypeError("RuleTester.setDefaultConfig: config must be an object");
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}
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defaultConfig = config;
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// Make sure the rules object exists since it is assumed to exist later
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defaultConfig.rules = defaultConfig.rules || {};
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}
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/**
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* Get the current configuration used for all tests
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* @returns {Object} the current configuration
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*/
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static getDefaultConfig() {
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return defaultConfig;
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}
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/**
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* Reset the configuration to the initial configuration of the tester removing
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* any changes made until now.
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* @returns {void}
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*/
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static resetDefaultConfig() {
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defaultConfig = lodash.cloneDeep(testerDefaultConfig);
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}
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/*
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* If people use `mocha test.js --watch` command, `describe` and `it` function
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* instances are different for each execution. So `describe` and `it` should get fresh instance
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* always.
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*/
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static get describe() {
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return (
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this[DESCRIBE] ||
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(typeof describe === "function" ? describe : describeDefaultHandler)
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);
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}
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static set describe(value) {
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this[DESCRIBE] = value;
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}
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static get it() {
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return (
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this[IT] ||
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(typeof it === "function" ? it : itDefaultHandler)
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);
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}
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static set it(value) {
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this[IT] = value;
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}
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/**
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* Define a rule for one particular run of tests.
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* @param {string} name The name of the rule to define.
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* @param {Function} rule The rule definition.
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* @returns {void}
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*/
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defineRule(name, rule) {
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this.rules[name] = rule;
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}
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/**
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* Adds a new rule test to execute.
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* @param {string} ruleName The name of the rule to run.
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* @param {Function} rule The rule to test.
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* @param {Object} test The collection of tests to run.
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* @returns {void}
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*/
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run(ruleName, rule, test) {
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const testerConfig = this.testerConfig,
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requiredScenarios = ["valid", "invalid"],
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scenarioErrors = [],
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linter = this.linter;
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if (lodash.isNil(test) || typeof test !== "object") {
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throw new TypeError(`Test Scenarios for rule ${ruleName} : Could not find test scenario object`);
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}
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requiredScenarios.forEach(scenarioType => {
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if (lodash.isNil(test[scenarioType])) {
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scenarioErrors.push(`Could not find any ${scenarioType} test scenarios`);
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}
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});
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if (scenarioErrors.length > 0) {
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throw new Error([
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`Test Scenarios for rule ${ruleName} is invalid:`
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].concat(scenarioErrors).join("\n"));
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}
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linter.defineRule(ruleName, Object.assign({}, rule, {
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// Create a wrapper rule that freezes the `context` properties.
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create(context) {
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freezeDeeply(context.options);
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freezeDeeply(context.settings);
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freezeDeeply(context.parserOptions);
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return (typeof rule === "function" ? rule : rule.create)(context);
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}
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}));
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linter.defineRules(this.rules);
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/**
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* Run the rule for the given item
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* @param {string|Object} item Item to run the rule against
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* @returns {Object} Eslint run result
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* @private
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*/
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function runRuleForItem(item) {
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let config = lodash.cloneDeep(testerConfig),
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code, filename, output, beforeAST, afterAST;
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if (typeof item === "string") {
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code = item;
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} else {
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code = item.code;
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/*
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* Assumes everything on the item is a config except for the
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* parameters used by this tester
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*/
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const itemConfig = lodash.omit(item, RuleTesterParameters);
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/*
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* Create the config object from the tester config and this item
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* specific configurations.
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*/
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config = lodash.merge(
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config,
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itemConfig
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);
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}
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if (item.filename) {
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filename = item.filename;
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}
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if (hasOwnProperty(item, "options")) {
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assert(Array.isArray(item.options), "options must be an array");
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config.rules[ruleName] = [1].concat(item.options);
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} else {
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config.rules[ruleName] = 1;
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}
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const schema = getRuleOptionsSchema(rule);
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/*
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* Setup AST getters.
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* The goal is to check whether or not AST was modified when
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* running the rule under test.
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*/
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linter.defineRule("rule-tester/validate-ast", () => ({
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Program(node) {
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beforeAST = cloneDeeplyExcludesParent(node);
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},
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"Program:exit"(node) {
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afterAST = node;
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}
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}));
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if (typeof config.parser === "string") {
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assert(path.isAbsolute(config.parser), "Parsers provided as strings to RuleTester must be absolute paths");
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linter.defineParser(config.parser, require(config.parser));
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}
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if (schema) {
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ajv.validateSchema(schema);
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if (ajv.errors) {
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const errors = ajv.errors.map(error => {
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const field = error.dataPath[0] === "." ? error.dataPath.slice(1) : error.dataPath;
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return `\t${field}: ${error.message}`;
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}).join("\n");
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throw new Error([`Schema for rule ${ruleName} is invalid:`, errors]);
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}
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/*
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* `ajv.validateSchema` checks for errors in the structure of the schema (by comparing the schema against a "meta-schema"),
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* and it reports those errors individually. However, there are other types of schema errors that only occur when compiling
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* the schema (e.g. using invalid defaults in a schema), and only one of these errors can be reported at a time. As a result,
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* the schema is compiled here separately from checking for `validateSchema` errors.
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*/
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try {
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ajv.compile(schema);
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} catch (err) {
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throw new Error(`Schema for rule ${ruleName} is invalid: ${err.message}`);
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}
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}
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validate(config, "rule-tester", id => (id === ruleName ? rule : null));
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// Verify the code.
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const messages = linter.verify(code, config, filename);
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// Ignore syntax errors for backward compatibility if `errors` is a number.
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if (typeof item.errors !== "number") {
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const errorMessage = messages.find(m => m.fatal);
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assert(!errorMessage, `A fatal parsing error occurred: ${errorMessage && errorMessage.message}`);
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}
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// Verify if autofix makes a syntax error or not.
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if (messages.some(m => m.fix)) {
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output = SourceCodeFixer.applyFixes(code, messages).output;
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const errorMessageInFix = linter.verify(output, config, filename).find(m => m.fatal);
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assert(!errorMessageInFix, `A fatal parsing error occurred in autofix: ${errorMessageInFix && errorMessageInFix.message}`);
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} else {
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output = code;
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}
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return {
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messages,
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output,
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beforeAST,
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afterAST: cloneDeeplyExcludesParent(afterAST)
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};
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}
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/**
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* Check if the AST was changed
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* @param {ASTNode} beforeAST AST node before running
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* @param {ASTNode} afterAST AST node after running
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* @returns {void}
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* @private
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*/
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function assertASTDidntChange(beforeAST, afterAST) {
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if (!lodash.isEqual(beforeAST, afterAST)) {
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assert.fail("Rule should not modify AST.");
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}
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}
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/**
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* Check if the template is valid or not
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* all valid cases go through this
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* @param {string|Object} item Item to run the rule against
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* @returns {void}
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* @private
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*/
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function testValidTemplate(item) {
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const result = runRuleForItem(item);
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const messages = result.messages;
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assert.strictEqual(messages.length, 0, util.format("Should have no errors but had %d: %s",
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messages.length, util.inspect(messages)));
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assertASTDidntChange(result.beforeAST, result.afterAST);
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}
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/**
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* Asserts that the message matches its expected value. If the expected
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* value is a regular expression, it is checked against the actual
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* value.
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* @param {string} actual Actual value
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* @param {string|RegExp} expected Expected value
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* @returns {void}
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* @private
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*/
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function assertMessageMatches(actual, expected) {
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if (expected instanceof RegExp) {
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// assert.js doesn't have a built-in RegExp match function
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assert.ok(
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expected.test(actual),
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`Expected '${actual}' to match ${expected}`
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);
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} else {
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assert.strictEqual(actual, expected);
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}
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}
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/**
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* Check if the template is invalid or not
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* all invalid cases go through this.
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* @param {string|Object} item Item to run the rule against
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* @returns {void}
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* @private
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*/
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function testInvalidTemplate(item) {
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assert.ok(item.errors || item.errors === 0,
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`Did not specify errors for an invalid test of ${ruleName}`);
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const result = runRuleForItem(item);
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const messages = result.messages;
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if (typeof item.errors === "number") {
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assert.strictEqual(messages.length, item.errors, util.format("Should have %d error%s but had %d: %s",
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item.errors, item.errors === 1 ? "" : "s", messages.length, util.inspect(messages)));
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} else {
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assert.strictEqual(
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messages.length, item.errors.length,
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util.format(
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"Should have %d error%s but had %d: %s",
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item.errors.length, item.errors.length === 1 ? "" : "s", messages.length, util.inspect(messages)
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)
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);
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const hasMessageOfThisRule = messages.some(m => m.ruleId === ruleName);
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for (let i = 0, l = item.errors.length; i < l; i++) {
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const error = item.errors[i];
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const message = messages[i];
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assert(hasMessageOfThisRule, "Error rule name should be the same as the name of the rule being tested");
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if (typeof error === "string" || error instanceof RegExp) {
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// Just an error message.
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assertMessageMatches(message.message, error);
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} else if (typeof error === "object") {
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/*
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* Error object.
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* This may have a message, messageId, data, node type, line, and/or
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* column.
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*/
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if (hasOwnProperty(error, "message")) {
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assert.ok(!hasOwnProperty(error, "messageId"), "Error should not specify both 'message' and a 'messageId'.");
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assert.ok(!hasOwnProperty(error, "data"), "Error should not specify both 'data' and 'message'.");
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assertMessageMatches(message.message, error.message);
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} else if (hasOwnProperty(error, "messageId")) {
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assert.ok(
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hasOwnProperty(rule, "meta") && hasOwnProperty(rule.meta, "messages"),
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"Error can not use 'messageId' if rule under test doesn't define 'meta.messages'."
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);
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if (!hasOwnProperty(rule.meta.messages, error.messageId)) {
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const friendlyIDList = `[${Object.keys(rule.meta.messages).map(key => `'${key}'`).join(", ")}]`;
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assert(false, `Invalid messageId '${error.messageId}'. Expected one of ${friendlyIDList}.`);
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}
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assert.strictEqual(
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message.messageId,
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error.messageId,
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`messageId '${message.messageId}' does not match expected messageId '${error.messageId}'.`
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);
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if (hasOwnProperty(error, "data")) {
|
|
|
|
/*
|
|
* if data was provided, then directly compare the returned message to a synthetic
|
|
* interpolated message using the same message ID and data provided in the test.
|
|
* See https://github.com/eslint/eslint/issues/9890 for context.
|
|
*/
|
|
const unformattedOriginalMessage = rule.meta.messages[error.messageId];
|
|
const rehydratedMessage = interpolate(unformattedOriginalMessage, error.data);
|
|
|
|
assert.strictEqual(
|
|
message.message,
|
|
rehydratedMessage,
|
|
`Hydrated message "${rehydratedMessage}" does not match "${message.message}"`
|
|
);
|
|
}
|
|
}
|
|
|
|
assert.ok(
|
|
hasOwnProperty(error, "data") ? hasOwnProperty(error, "messageId") : true,
|
|
"Error must specify 'messageId' if 'data' is used."
|
|
);
|
|
|
|
if (error.type) {
|
|
assert.strictEqual(message.nodeType, error.type, `Error type should be ${error.type}, found ${message.nodeType}`);
|
|
}
|
|
|
|
if (hasOwnProperty(error, "line")) {
|
|
assert.strictEqual(message.line, error.line, `Error line should be ${error.line}`);
|
|
}
|
|
|
|
if (hasOwnProperty(error, "column")) {
|
|
assert.strictEqual(message.column, error.column, `Error column should be ${error.column}`);
|
|
}
|
|
|
|
if (hasOwnProperty(error, "endLine")) {
|
|
assert.strictEqual(message.endLine, error.endLine, `Error endLine should be ${error.endLine}`);
|
|
}
|
|
|
|
if (hasOwnProperty(error, "endColumn")) {
|
|
assert.strictEqual(message.endColumn, error.endColumn, `Error endColumn should be ${error.endColumn}`);
|
|
}
|
|
|
|
if (hasOwnProperty(error, "suggestions")) {
|
|
|
|
// Support asserting there are no suggestions
|
|
if (!error.suggestions || (Array.isArray(error.suggestions) && error.suggestions.length === 0)) {
|
|
if (Array.isArray(message.suggestions) && message.suggestions.length > 0) {
|
|
assert.fail(`Error should have no suggestions on error with message: "${message.message}"`);
|
|
}
|
|
} else {
|
|
assert.strictEqual(Array.isArray(message.suggestions), true, `Error should have an array of suggestions. Instead received "${message.suggestions}" on error with message: "${message.message}"`);
|
|
assert.strictEqual(message.suggestions.length, error.suggestions.length, `Error should have ${error.suggestions.length} suggestions. Instead found ${message.suggestions.length} suggestions`);
|
|
|
|
error.suggestions.forEach((expectedSuggestion, index) => {
|
|
const actualSuggestion = message.suggestions[index];
|
|
|
|
/**
|
|
* Tests equality of a suggestion key if that key is defined in the expected output.
|
|
* @param {string} key Key to validate from the suggestion object
|
|
* @returns {void}
|
|
*/
|
|
function assertSuggestionKeyEquals(key) {
|
|
if (hasOwnProperty(expectedSuggestion, key)) {
|
|
assert.deepStrictEqual(actualSuggestion[key], expectedSuggestion[key], `Error suggestion at index: ${index} should have desc of: "${actualSuggestion[key]}"`);
|
|
}
|
|
}
|
|
assertSuggestionKeyEquals("desc");
|
|
assertSuggestionKeyEquals("messageId");
|
|
|
|
if (hasOwnProperty(expectedSuggestion, "output")) {
|
|
const codeWithAppliedSuggestion = SourceCodeFixer.applyFixes(item.code, [actualSuggestion]).output;
|
|
|
|
assert.strictEqual(codeWithAppliedSuggestion, expectedSuggestion.output, `Expected the applied suggestion fix to match the test suggestion output for suggestion at index: ${index} on error with message: "${message.message}"`);
|
|
}
|
|
});
|
|
}
|
|
}
|
|
} else {
|
|
|
|
// Message was an unexpected type
|
|
assert.fail(`Error should be a string, object, or RegExp, but found (${util.inspect(message)})`);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (hasOwnProperty(item, "output")) {
|
|
if (item.output === null) {
|
|
assert.strictEqual(
|
|
result.output,
|
|
item.code,
|
|
"Expected no autofixes to be suggested"
|
|
);
|
|
} else {
|
|
assert.strictEqual(result.output, item.output, "Output is incorrect.");
|
|
}
|
|
}
|
|
|
|
assertASTDidntChange(result.beforeAST, result.afterAST);
|
|
}
|
|
|
|
/*
|
|
* This creates a mocha test suite and pipes all supplied info through
|
|
* one of the templates above.
|
|
*/
|
|
RuleTester.describe(ruleName, () => {
|
|
RuleTester.describe("valid", () => {
|
|
test.valid.forEach(valid => {
|
|
RuleTester.it(sanitize(typeof valid === "object" ? valid.code : valid), () => {
|
|
testValidTemplate(valid);
|
|
});
|
|
});
|
|
});
|
|
|
|
RuleTester.describe("invalid", () => {
|
|
test.invalid.forEach(invalid => {
|
|
RuleTester.it(sanitize(invalid.code), () => {
|
|
testInvalidTemplate(invalid);
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
}
|
|
|
|
RuleTester[DESCRIBE] = RuleTester[IT] = null;
|
|
|
|
module.exports = RuleTester;
|