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Viewing file:     test.js (8.59 KB)      -rw-r--r--

'use strict';

/**
 * Module dependencies.
 */

var request = require('superagent');
var util = require('util');
var http = require('http');
var https = require('https');
var assert = require('assert');
var Request = request.Request;

/**
 * Expose `Test`.
 */

module.exports = Test;

/**
 * Initialize a new `Test` with the given `app`,
 * request `method` and `path`.
 *
 * @param {Server} app
 * @param {String} method
 * @param {String} path
 * @api public
 */

function Test(app, method, path) {
  Request.call(this, method.toUpperCase(), path);
  this.redirects(0);
  this.buffer();
  this.app = app;
  this._asserts = [];
  this.url = typeof app === 'string'
    ? app + path
    : this.serverAddress(app, path);
}

/**
 * Inherits from `Request.prototype`.
 */

Object.setPrototypeOf(Test.prototype, Request.prototype);

/**
 * Returns a URL, extracted from a server.
 *
 * @param {Server} app
 * @param {String} path
 * @returns {String} URL address
 * @api private
 */

Test.prototype.serverAddress = function(app, path) {
  var addr = app.address();
  var port;
  var protocol;

  if (!addr) this._server = app.listen(0);
  port = app.address().port;
  protocol = app instanceof https.Server ? 'https' : 'http';
  return protocol + '://127.0.0.1:' + port + path;
};

/**
 * Wraps an assert function into another.
 * The wrapper function edit the stack trace of any assertion error, prepending a more useful stack to it.
 *
 * @param {Function} assertFn
 * @returns {Function} wrapped assert function
 */

function wrapAssertFn(assertFn) {
  var savedStack = new Error().stack.split('\n').slice(3);

  return function(res) {
    var badStack;
    var err = assertFn(res);
    if (err instanceof Error && err.stack) {
      badStack = err.stack.replace(err.message, '').split('\n').slice(1);
      err.stack = [err.toString()]
        .concat(savedStack)
        .concat('----')
        .concat(badStack)
        .join('\n');
    }
    return err;
  };
}

/**
 * Expectations:
 *
 *   .expect(200)
 *   .expect(200, fn)
 *   .expect(200, body)
 *   .expect('Some body')
 *   .expect('Some body', fn)
 *   .expect(['json array body', { key: 'val' }])
 *   .expect('Content-Type', 'application/json')
 *   .expect('Content-Type', 'application/json', fn)
 *   .expect(fn)
 *   .expect([200, 404])
 *
 * @return {Test}
 * @api public
 */

Test.prototype.expect = function(a, b, c) {
  // callback
  if (typeof a === 'function') {
    this._asserts.push(wrapAssertFn(a));
    return this;
  }
  if (typeof b === 'function') this.end(b);
  if (typeof c === 'function') this.end(c);

  // status
  if (typeof a === 'number') {
    this._asserts.push(wrapAssertFn(this._assertStatus.bind(this, a)));
    // body
    if (typeof b !== 'function' && arguments.length > 1) {
      this._asserts.push(wrapAssertFn(this._assertBody.bind(this, b)));
    }
    return this;
  }

  // multiple statuses
  if (Array.isArray(a) && a.length > 0 && a.every(val => typeof val === 'number')) {
    this._asserts.push(wrapAssertFn(this._assertStatusArray.bind(this, a)));
    return this;
  }

  // header field
  if (typeof b === 'string' || typeof b === 'number' || b instanceof RegExp) {
    this._asserts.push(wrapAssertFn(this._assertHeader.bind(this, { name: '' + a, value: b })));
    return this;
  }

  // body
  this._asserts.push(wrapAssertFn(this._assertBody.bind(this, a)));

  return this;
};

/**
 * Defer invoking superagent's `.end()` until
 * the server is listening.
 *
 * @param {Function} fn
 * @api public
 */

Test.prototype.end = function(fn) {
  var self = this;
  var server = this._server;
  var end = Request.prototype.end;

  end.call(this, function(err, res) {
    if (server && server._handle) return server.close(localAssert);

    localAssert();

    function localAssert() {
      self.assert(err, res, fn);
    }
  });

  return this;
};

/**
 * Perform assertions and invoke `fn(err, res)`.
 *
 * @param {?Error} resError
 * @param {Response} res
 * @param {Function} fn
 * @api private
 */

Test.prototype.assert = function(resError, res, fn) {
  var errorObj;
  var i;

  // check for unexpected network errors or server not running/reachable errors
  // when there is no response and superagent sends back a System Error
  // do not check further for other asserts, if any, in such case
  // https://nodejs.org/api/errors.html#errors_common_system_errors
  var sysErrors = {
    ECONNREFUSED: 'Connection refused',
    ECONNRESET: 'Connection reset by peer',
    EPIPE: 'Broken pipe',
    ETIMEDOUT: 'Operation timed out'
  };

  if (!res && resError) {
    if (resError instanceof Error && resError.syscall === 'connect'
        && Object.getOwnPropertyNames(sysErrors).indexOf(resError.code) >= 0) {
      errorObj = new Error(resError.code + ': ' + sysErrors[resError.code]);
    } else {
      errorObj = resError;
    }
  }

  // asserts
  for (i = 0; i < this._asserts.length && !errorObj; i += 1) {
    errorObj = this._assertFunction(this._asserts[i], res);
  }

  // set unexpected superagent error if no other error has occurred.
  if (!errorObj && resError instanceof Error && (!res || resError.status !== res.status)) {
    errorObj = resError;
  }

  fn.call(this, errorObj || null, res);
};

/**
 * Perform assertions on a response body and return an Error upon failure.
 *
 * @param {Mixed} body
 * @param {Response} res
 * @return {?Error}
 * @api private
 */

Test.prototype._assertBody = function(body, res) {
  var isregexp = body instanceof RegExp;
  var a;
  var b;

  // parsed
  if (typeof body === 'object' && !isregexp) {
    try {
      assert.deepStrictEqual(body, res.body);
    } catch (err) {
      a = util.inspect(body);
      b = util.inspect(res.body);
      return error('expected ' + a + ' response body, got ' + b, body, res.body);
    }
  } else if (body !== res.text) {
    // string
    a = util.inspect(body);
    b = util.inspect(res.text);

    // regexp
    if (isregexp) {
      if (!body.test(res.text)) {
        return error('expected body ' + b + ' to match ' + body, body, res.body);
      }
    } else {
      return error('expected ' + a + ' response body, got ' + b, body, res.body);
    }
  }
};

/**
 * Perform assertions on a response header and return an Error upon failure.
 *
 * @param {Object} header
 * @param {Response} res
 * @return {?Error}
 * @api private
 */

Test.prototype._assertHeader = function(header, res) {
  var field = header.name;
  var actual = res.header[field.toLowerCase()];
  var fieldExpected = header.value;

  if (typeof actual === 'undefined') return new Error('expected "' + field + '" header field');
  // This check handles header values that may be a String or single element Array
  if ((Array.isArray(actual) && actual.toString() === fieldExpected)
    || fieldExpected === actual) {
    return;
  }
  if (fieldExpected instanceof RegExp) {
    if (!fieldExpected.test(actual)) {
      return new Error('expected "' + field + '" matching '
        + fieldExpected + ', got "' + actual + '"');
    }
  } else {
    return new Error('expected "' + field + '" of "' + fieldExpected + '", got "' + actual + '"');
  }
};

/**
 * Perform assertions on the response status and return an Error upon failure.
 *
 * @param {Number} status
 * @param {Response} res
 * @return {?Error}
 * @api private
 */

Test.prototype._assertStatus = function(status, res) {
  var a;
  var b;
  if (res.status !== status) {
    a = http.STATUS_CODES[status];
    b = http.STATUS_CODES[res.status];
    return new Error('expected ' + status + ' "' + a + '", got ' + res.status + ' "' + b + '"');
  }
};

/**
 * Perform assertions on the response status and return an Error upon failure.
 *
 * @param {Array<Number>} statusArray
 * @param {Response} res
 * @return {?Error}
 * @api private
 */

Test.prototype._assertStatusArray = function(statusArray, res) {
  var b;
  var expectedList;
  if (!statusArray.includes(res.status)) {
    b = http.STATUS_CODES[res.status];
    expectedList = statusArray.join(', ');
    return new Error('expected one of "' + expectedList + '", got ' + res.status + ' "' + b + '"');
  }
};

/**
 * Performs an assertion by calling a function and return an Error upon failure.
 *
 * @param {Function} fn
 * @param {Response} res
 * @return {?Error}
 * @api private
 */
Test.prototype._assertFunction = function(fn, res) {
  var err;
  try {
    err = fn(res);
  } catch (e) {
    err = e;
  }
  if (err instanceof Error) return err;
};

/**
 * Return an `Error` with `msg` and results properties.
 *
 * @param {String} msg
 * @param {Mixed} expected
 * @param {Mixed} actual
 * @return {Error}
 * @api private
 */

function error(msg, expected, actual) {
  var err = new Error(msg);
  err.expected = expected;
  err.actual = actual;
  err.showDiff = true;
  return err;
}