如何以编程方式向 mocha 添加递归选项？

Question

我按照教程以编程方式运行 mocha。但是--recursive，当我使用npm test.

var Mocha = require('mocha'),
    fs = require('fs'),
    path = require('path');

// Instantiate a Mocha instance.
var mocha = new Mocha();

var testDir = 'some/dir/test'

// Add each .js file to the mocha instance
fs.readdirSync(testDir).filter(function(file){
    // Only keep the .js files
    return file.substr(-3) === '.js';

}).forEach(function(file){
    mocha.addFile(
        path.join(testDir, file)
    );
});

// Run the tests.
mocha.run(function(failures){
  process.on('exit', function () {
    process.exit(failures);  // exit with non-zero status if there were failures
  });
});

Answer 1

Mocha的--recursive选项是一个命令行选项。它只能在通过命令行调用 Mocha 时应用，即使用以下用法语法时：

Usage: mocha [debug] [options] [files]

您当前fs.readdirSync()在节点脚本中的实现不会以.js递归方式获取测试文件。它仅获取目录顶层的路径。

fs.readdirSync() 不提供递归读取目录的选项。

考虑编写一个递归获取.js测试文件的自定义函数。

例如：

var fs = require('fs'),
    path = require('path'),
    Mocha = require('mocha');

// Instantiate a Mocha instance.
var mocha = new Mocha();

var testDir = 'path/to/test/files/';

/**
 * Gets the test .js file paths recursively from a given directory.
 * @param {String} dir - path to directory containing test files.
 * @returns {Array} Filepaths to each test .js file.
 */
function getTestPaths(dir, fileList) {
    var files = fs.readdirSync(dir);
    fileList = fileList || [];

    files.forEach(function(file) {
        if (fs.statSync(path.join(dir, file)).isDirectory()) {
            fileList = getTestPaths(path.join(dir, file), fileList);
        } else {
            fileList.push(path.join(dir, file));
        }
    });

    return fileList.filter(function (file) {
        return path.extname(file) === '.js';
    });
}

// Get all .js paths and add each file to the mocha instance.
getTestPaths(testDir).forEach(function(file) {
    mocha.addFile(
        path.join(file)
    );
});

// Run the tests.
mocha.run(function(failures) {
    process.on('exit', function () {
        process.exit(failures);
    });
});

注意：该getTestPaths函数递归地遍历目录并返回一个文件.js路径数组。