mustache.js/test/render-helper.js

var fs = require('fs');
var path = require('path');

var _files = path.join(__dirname, '_files');

function getContents(testName, ext) {
  try {
    return fs.readFileSync(path.join(_files, testName + '.' + ext), 'utf8');
  } catch (ex) {
    return null;
  }
}

function getView(testName) {
  var view = getContents(testName, 'js');
  if (!view) throw new Error('Cannot find view for test "' + testName + '"');
  return view;
}

function getPartial(testName) {
  try {
    return getContents(testName, 'partial');
  } catch (error) {
    // No big deal. Not all tests need to test partial support.
  }
}

// You can put the name of a specific test to run in the TEST environment
// variable (e.g. TEST=backslashes mocha test/render-test.js)
var testToRun = process.env.TEST;

var testNames;
if (testToRun) {
  testNames = testToRun.split(',');
} else {
  testNames = fs.readdirSync(_files).filter(function (file) {
    return (/\.js$/).test(file);
  }).map(function (file) {
    return path.basename(file).replace(/\.js$/, '');
  });
}

function getTest(testName) {
  return {
    name: testName,
    view: getView(testName),
    template: getContents(testName, 'mustache'),
    partial: getPartial(testName),
    expect: getContents(testName, 'txt')
  };
}

exports.getTests = function getTests() {
  return testNames.map(getTest);
};