559 lines
19 KiB
JavaScript
559 lines
19 KiB
JavaScript
/**
|
|
* @fileoverview Mocha test wrapper
|
|
* @author Ilya Volodin
|
|
*/
|
|
"use strict";
|
|
|
|
/* global describe, it */
|
|
|
|
/*
|
|
* This is a wrapper around mocha to allow for DRY unittests for eslint
|
|
* Format:
|
|
* RuleTester.run("{ruleName}", {
|
|
* valid: [
|
|
* "{code}",
|
|
* { code: "{code}", options: {options}, globals: {globals}, parser: "{parser}", settings: {settings} }
|
|
* ],
|
|
* invalid: [
|
|
* { code: "{code}", errors: {numErrors} },
|
|
* { code: "{code}", errors: ["{errorMessage}"] },
|
|
* { code: "{code}", options: {options}, globals: {globals}, parser: "{parser}", settings: {settings}, errors: [{ message: "{errorMessage}", type: "{errorNodeType}"}] }
|
|
* ]
|
|
* });
|
|
*
|
|
* Variables:
|
|
* {code} - String that represents the code to be tested
|
|
* {options} - Arguments that are passed to the configurable rules.
|
|
* {globals} - An object representing a list of variables that are
|
|
* registered as globals
|
|
* {parser} - String representing the parser to use
|
|
* {settings} - An object representing global settings for all rules
|
|
* {numErrors} - If failing case doesn't need to check error message,
|
|
* this integer will specify how many errors should be
|
|
* received
|
|
* {errorMessage} - Message that is returned by the rule on failure
|
|
* {errorNodeType} - AST node type that is returned by they rule as
|
|
* a cause of the failure.
|
|
*/
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Requirements
|
|
//------------------------------------------------------------------------------
|
|
|
|
const lodash = require("lodash"),
|
|
assert = require("assert"),
|
|
util = require("util"),
|
|
validator = require("../config/config-validator"),
|
|
ajv = require("../util/ajv"),
|
|
Linter = require("../linter"),
|
|
Environments = require("../config/environments"),
|
|
SourceCodeFixer = require("../util/source-code-fixer");
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Private Members
|
|
//------------------------------------------------------------------------------
|
|
|
|
/*
|
|
* testerDefaultConfig must not be modified as it allows to reset the tester to
|
|
* the initial default configuration
|
|
*/
|
|
const testerDefaultConfig = { rules: {} };
|
|
let defaultConfig = { rules: {} };
|
|
|
|
/*
|
|
* List every parameters possible on a test case that are not related to eslint
|
|
* configuration
|
|
*/
|
|
const RuleTesterParameters = [
|
|
"code",
|
|
"filename",
|
|
"options",
|
|
"errors",
|
|
"output"
|
|
];
|
|
|
|
const hasOwnProperty = Function.call.bind(Object.hasOwnProperty);
|
|
|
|
/**
|
|
* Clones a given value deeply.
|
|
* Note: This ignores `parent` property.
|
|
*
|
|
* @param {any} x - A value to clone.
|
|
* @returns {any} A cloned value.
|
|
*/
|
|
function cloneDeeplyExcludesParent(x) {
|
|
if (typeof x === "object" && x !== null) {
|
|
if (Array.isArray(x)) {
|
|
return x.map(cloneDeeplyExcludesParent);
|
|
}
|
|
|
|
const retv = {};
|
|
|
|
for (const key in x) {
|
|
if (key !== "parent" && hasOwnProperty(x, key)) {
|
|
retv[key] = cloneDeeplyExcludesParent(x[key]);
|
|
}
|
|
}
|
|
|
|
return retv;
|
|
}
|
|
|
|
return x;
|
|
}
|
|
|
|
/**
|
|
* Freezes a given value deeply.
|
|
*
|
|
* @param {any} x - A value to freeze.
|
|
* @returns {void}
|
|
*/
|
|
function freezeDeeply(x) {
|
|
if (typeof x === "object" && x !== null) {
|
|
if (Array.isArray(x)) {
|
|
x.forEach(freezeDeeply);
|
|
} else {
|
|
for (const key in x) {
|
|
if (key !== "parent" && hasOwnProperty(x, key)) {
|
|
freezeDeeply(x[key]);
|
|
}
|
|
}
|
|
}
|
|
Object.freeze(x);
|
|
}
|
|
}
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Public Interface
|
|
//------------------------------------------------------------------------------
|
|
|
|
// default separators for testing
|
|
const DESCRIBE = Symbol("describe");
|
|
const IT = Symbol("it");
|
|
|
|
/**
|
|
* This is `it` or `describe` if those don't exist.
|
|
* @this {Mocha}
|
|
* @param {string} text - The description of the test case.
|
|
* @param {Function} method - The logic of the test case.
|
|
* @returns {any} Returned value of `method`.
|
|
*/
|
|
function defaultHandler(text, method) {
|
|
return method.apply(this);
|
|
}
|
|
|
|
class RuleTester {
|
|
|
|
/**
|
|
* Creates a new instance of RuleTester.
|
|
* @param {Object} [testerConfig] Optional, extra configuration for the tester
|
|
* @constructor
|
|
*/
|
|
constructor(testerConfig) {
|
|
|
|
/**
|
|
* The configuration to use for this tester. Combination of the tester
|
|
* configuration and the default configuration.
|
|
* @type {Object}
|
|
*/
|
|
this.testerConfig = lodash.merge(
|
|
|
|
// we have to clone because merge uses the first argument for recipient
|
|
lodash.cloneDeep(defaultConfig),
|
|
testerConfig,
|
|
{ rules: { "rule-tester/validate-ast": "error" } }
|
|
);
|
|
|
|
/**
|
|
* Rule definitions to define before tests.
|
|
* @type {Object}
|
|
*/
|
|
this.rules = {};
|
|
this.linter = new Linter();
|
|
}
|
|
|
|
/**
|
|
* Set the configuration to use for all future tests
|
|
* @param {Object} config the configuration to use.
|
|
* @returns {void}
|
|
*/
|
|
static setDefaultConfig(config) {
|
|
if (typeof config !== "object") {
|
|
throw new TypeError("RuleTester.setDefaultConfig: config must be an object");
|
|
}
|
|
defaultConfig = config;
|
|
|
|
// Make sure the rules object exists since it is assumed to exist later
|
|
defaultConfig.rules = defaultConfig.rules || {};
|
|
}
|
|
|
|
/**
|
|
* Get the current configuration used for all tests
|
|
* @returns {Object} the current configuration
|
|
*/
|
|
static getDefaultConfig() {
|
|
return defaultConfig;
|
|
}
|
|
|
|
/**
|
|
* Reset the configuration to the initial configuration of the tester removing
|
|
* any changes made until now.
|
|
* @returns {void}
|
|
*/
|
|
static resetDefaultConfig() {
|
|
defaultConfig = lodash.cloneDeep(testerDefaultConfig);
|
|
}
|
|
|
|
|
|
/*
|
|
* If people use `mocha test.js --watch` command, `describe` and `it` function
|
|
* instances are different for each execution. So `describe` and `it` should get fresh instance
|
|
* always.
|
|
*/
|
|
static get describe() {
|
|
return (
|
|
this[DESCRIBE] ||
|
|
(typeof describe === "function" ? describe : defaultHandler)
|
|
);
|
|
}
|
|
|
|
static set describe(value) {
|
|
this[DESCRIBE] = value;
|
|
}
|
|
|
|
static get it() {
|
|
return (
|
|
this[IT] ||
|
|
(typeof it === "function" ? it : defaultHandler)
|
|
);
|
|
}
|
|
|
|
static set it(value) {
|
|
this[IT] = value;
|
|
}
|
|
|
|
/**
|
|
* Define a rule for one particular run of tests.
|
|
* @param {string} name The name of the rule to define.
|
|
* @param {Function} rule The rule definition.
|
|
* @returns {void}
|
|
*/
|
|
defineRule(name, rule) {
|
|
this.rules[name] = rule;
|
|
}
|
|
|
|
/**
|
|
* Adds a new rule test to execute.
|
|
* @param {string} ruleName The name of the rule to run.
|
|
* @param {Function} rule The rule to test.
|
|
* @param {Object} test The collection of tests to run.
|
|
* @returns {void}
|
|
*/
|
|
run(ruleName, rule, test) {
|
|
|
|
const testerConfig = this.testerConfig,
|
|
requiredScenarios = ["valid", "invalid"],
|
|
scenarioErrors = [],
|
|
linter = this.linter;
|
|
|
|
if (lodash.isNil(test) || typeof test !== "object") {
|
|
throw new TypeError(`Test Scenarios for rule ${ruleName} : Could not find test scenario object`);
|
|
}
|
|
|
|
requiredScenarios.forEach(scenarioType => {
|
|
if (lodash.isNil(test[scenarioType])) {
|
|
scenarioErrors.push(`Could not find any ${scenarioType} test scenarios`);
|
|
}
|
|
});
|
|
|
|
if (scenarioErrors.length > 0) {
|
|
throw new Error([
|
|
`Test Scenarios for rule ${ruleName} is invalid:`
|
|
].concat(scenarioErrors).join("\n"));
|
|
}
|
|
|
|
|
|
linter.defineRule(ruleName, Object.assign({}, rule, {
|
|
|
|
// Create a wrapper rule that freezes the `context` properties.
|
|
create(context) {
|
|
freezeDeeply(context.options);
|
|
freezeDeeply(context.settings);
|
|
freezeDeeply(context.parserOptions);
|
|
|
|
return (typeof rule === "function" ? rule : rule.create)(context);
|
|
}
|
|
}));
|
|
|
|
linter.defineRules(this.rules);
|
|
|
|
const ruleMap = linter.getRules();
|
|
|
|
/**
|
|
* Run the rule for the given item
|
|
* @param {string|Object} item Item to run the rule against
|
|
* @returns {Object} Eslint run result
|
|
* @private
|
|
*/
|
|
function runRuleForItem(item) {
|
|
let config = lodash.cloneDeep(testerConfig),
|
|
code, filename, beforeAST, afterAST;
|
|
|
|
if (typeof item === "string") {
|
|
code = item;
|
|
} else {
|
|
code = item.code;
|
|
|
|
/*
|
|
* Assumes everything on the item is a config except for the
|
|
* parameters used by this tester
|
|
*/
|
|
const itemConfig = lodash.omit(item, RuleTesterParameters);
|
|
|
|
/*
|
|
* Create the config object from the tester config and this item
|
|
* specific configurations.
|
|
*/
|
|
config = lodash.merge(
|
|
config,
|
|
itemConfig
|
|
);
|
|
}
|
|
|
|
if (item.filename) {
|
|
filename = item.filename;
|
|
}
|
|
|
|
if (Object.prototype.hasOwnProperty.call(item, "options")) {
|
|
assert(Array.isArray(item.options), "options must be an array");
|
|
config.rules[ruleName] = [1].concat(item.options);
|
|
} else {
|
|
config.rules[ruleName] = 1;
|
|
}
|
|
|
|
const schema = validator.getRuleOptionsSchema(rule);
|
|
|
|
/*
|
|
* Setup AST getters.
|
|
* The goal is to check whether or not AST was modified when
|
|
* running the rule under test.
|
|
*/
|
|
linter.defineRule("rule-tester/validate-ast", () => ({
|
|
Program(node) {
|
|
beforeAST = cloneDeeplyExcludesParent(node);
|
|
},
|
|
"Program:exit"(node) {
|
|
afterAST = node;
|
|
}
|
|
}));
|
|
|
|
if (schema) {
|
|
ajv.validateSchema(schema);
|
|
|
|
if (ajv.errors) {
|
|
const errors = ajv.errors.map(error => {
|
|
const field = error.dataPath[0] === "." ? error.dataPath.slice(1) : error.dataPath;
|
|
|
|
return `\t${field}: ${error.message}`;
|
|
}).join("\n");
|
|
|
|
throw new Error([`Schema for rule ${ruleName} is invalid:`, errors]);
|
|
}
|
|
}
|
|
|
|
validator.validate(config, "rule-tester", ruleMap.get.bind(ruleMap), new Environments());
|
|
|
|
return {
|
|
messages: linter.verify(code, config, filename, true),
|
|
beforeAST,
|
|
afterAST: cloneDeeplyExcludesParent(afterAST)
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Check if the AST was changed
|
|
* @param {ASTNode} beforeAST AST node before running
|
|
* @param {ASTNode} afterAST AST node after running
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function assertASTDidntChange(beforeAST, afterAST) {
|
|
if (!lodash.isEqual(beforeAST, afterAST)) {
|
|
|
|
// Not using directly to avoid performance problem in node 6.1.0. See #6111
|
|
// eslint-disable-next-line no-restricted-properties
|
|
assert.deepEqual(beforeAST, afterAST, "Rule should not modify AST.");
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if the template is valid or not
|
|
* all valid cases go through this
|
|
* @param {string|Object} item Item to run the rule against
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function testValidTemplate(item) {
|
|
const result = runRuleForItem(item);
|
|
const messages = result.messages;
|
|
|
|
assert.strictEqual(messages.length, 0, util.format("Should have no errors but had %d: %s",
|
|
messages.length, util.inspect(messages)));
|
|
|
|
assertASTDidntChange(result.beforeAST, result.afterAST);
|
|
}
|
|
|
|
/**
|
|
* Asserts that the message matches its expected value. If the expected
|
|
* value is a regular expression, it is checked against the actual
|
|
* value.
|
|
* @param {string} actual Actual value
|
|
* @param {string|RegExp} expected Expected value
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function assertMessageMatches(actual, expected) {
|
|
if (expected instanceof RegExp) {
|
|
|
|
// assert.js doesn't have a built-in RegExp match function
|
|
assert.ok(
|
|
expected.test(actual),
|
|
`Expected '${actual}' to match ${expected}`
|
|
);
|
|
} else {
|
|
assert.strictEqual(actual, expected);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Check if the template is invalid or not
|
|
* all invalid cases go through this.
|
|
* @param {string|Object} item Item to run the rule against
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
function testInvalidTemplate(item) {
|
|
assert.ok(item.errors || item.errors === 0,
|
|
`Did not specify errors for an invalid test of ${ruleName}`);
|
|
|
|
const result = runRuleForItem(item);
|
|
const messages = result.messages;
|
|
|
|
|
|
if (typeof item.errors === "number") {
|
|
assert.strictEqual(messages.length, item.errors, util.format("Should have %d error%s but had %d: %s",
|
|
item.errors, item.errors === 1 ? "" : "s", messages.length, util.inspect(messages)));
|
|
} else {
|
|
assert.strictEqual(
|
|
messages.length, item.errors.length,
|
|
util.format(
|
|
"Should have %d error%s but had %d: %s",
|
|
item.errors.length, item.errors.length === 1 ? "" : "s", messages.length, util.inspect(messages)
|
|
)
|
|
);
|
|
|
|
const hasMessageOfThisRule = messages.some(m => m.ruleId === ruleName);
|
|
|
|
for (let i = 0, l = item.errors.length; i < l; i++) {
|
|
assert(!messages[i].fatal, `A fatal parsing error occurred: ${messages[i].message}`);
|
|
assert(hasMessageOfThisRule, "Error rule name should be the same as the name of the rule being tested");
|
|
|
|
if (typeof item.errors[i] === "string" || item.errors[i] instanceof RegExp) {
|
|
|
|
// Just an error message.
|
|
assertMessageMatches(messages[i].message, item.errors[i]);
|
|
} else if (typeof item.errors[i] === "object") {
|
|
|
|
/*
|
|
* Error object.
|
|
* This may have a message, node type, line, and/or
|
|
* column.
|
|
*/
|
|
if (item.errors[i].message) {
|
|
assertMessageMatches(messages[i].message, item.errors[i].message);
|
|
}
|
|
|
|
// The following checks use loose equality assertions for backwards compatibility.
|
|
|
|
if (item.errors[i].type) {
|
|
|
|
// eslint-disable-next-line no-restricted-properties
|
|
assert.equal(messages[i].nodeType, item.errors[i].type, `Error type should be ${item.errors[i].type}, found ${messages[i].nodeType}`);
|
|
}
|
|
|
|
if (item.errors[i].hasOwnProperty("line")) {
|
|
|
|
// eslint-disable-next-line no-restricted-properties
|
|
assert.equal(messages[i].line, item.errors[i].line, `Error line should be ${item.errors[i].line}`);
|
|
}
|
|
|
|
if (item.errors[i].hasOwnProperty("column")) {
|
|
|
|
// eslint-disable-next-line no-restricted-properties
|
|
assert.equal(messages[i].column, item.errors[i].column, `Error column should be ${item.errors[i].column}`);
|
|
}
|
|
|
|
if (item.errors[i].hasOwnProperty("endLine")) {
|
|
|
|
// eslint-disable-next-line no-restricted-properties
|
|
assert.equal(messages[i].endLine, item.errors[i].endLine, `Error endLine should be ${item.errors[i].endLine}`);
|
|
}
|
|
|
|
if (item.errors[i].hasOwnProperty("endColumn")) {
|
|
|
|
// eslint-disable-next-line no-restricted-properties
|
|
assert.equal(messages[i].endColumn, item.errors[i].endColumn, `Error endColumn should be ${item.errors[i].endColumn}`);
|
|
}
|
|
} else {
|
|
|
|
// Message was an unexpected type
|
|
assert.fail(messages[i], null, "Error should be a string, object, or RegExp.");
|
|
}
|
|
}
|
|
}
|
|
|
|
if (item.hasOwnProperty("output")) {
|
|
if (item.output === null) {
|
|
assert.strictEqual(
|
|
messages.filter(message => message.fix).length,
|
|
0,
|
|
"Expected no autofixes to be suggested"
|
|
);
|
|
} else {
|
|
const fixResult = SourceCodeFixer.applyFixes(item.code, messages);
|
|
|
|
// eslint-disable-next-line no-restricted-properties
|
|
assert.equal(fixResult.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(typeof valid === "object" ? valid.code : valid, () => {
|
|
testValidTemplate(valid);
|
|
});
|
|
});
|
|
});
|
|
|
|
RuleTester.describe("invalid", () => {
|
|
test.invalid.forEach(invalid => {
|
|
RuleTester.it(invalid.code, () => {
|
|
testInvalidTemplate(invalid);
|
|
});
|
|
});
|
|
});
|
|
});
|
|
}
|
|
}
|
|
|
|
RuleTester[DESCRIBE] = RuleTester[IT] = null;
|
|
|
|
module.exports = RuleTester;
|