Use modern pathToFileURL in tests

Also delete some unneeded utils.

lib/jsdom/utils.js

@@ -1,22 +1,8 @@
 "use strict";
-const path = require("path");
 const whatwgURL = require("whatwg-url");
 const { domSymbolTree } = require("./living/helpers/internal-constants");
 const SYMBOL_TREE_POSITION = require("symbol-tree").TreePosition;
 
-exports.toFileUrl = function (fileName) {
-  // Beyond just the `path.resolve`, this is mostly for the benefit of Windows,
-  // where we need to convert "\" to "/" and add an extra "/" prefix before the
-  // drive letter.
-  let pathname = path.resolve(process.cwd(), fileName).replace(/\\/g, "/");
-  if (pathname[0] !== "/") {
-    pathname = "/" + pathname;
-  }
-
-  // path might contain spaces, so convert those to %20
-  return "file://" + encodeURI(pathname);
-};
-
 /**
  * Define a set of properties on an object, by copying the property descriptors
  * from the original object.
@@ -31,29 +17,6 @@ exports.define = function define(object, properties) {
   }
 };
 
-/**
- * Define a list of constants on a constructor and its .prototype
- *
- * - `Constructor` {Function} the constructor to define the constants on
- * - `propertyMap` {Object}  key/value map of properties to define
- */
-exports.addConstants = function addConstants(Constructor, propertyMap) {
-  for (const property in propertyMap) {
-    const value = propertyMap[property];
-    addConstant(Constructor, property, value);
-    addConstant(Constructor.prototype, property, value);
-  }
-};
-
-function addConstant(object, property, value) {
-  Object.defineProperty(object, property, {
-    configurable: false,
-    enumerable: true,
-    writable: false,
-    value
-  });
-}
-
 exports.mixin = (target, source) => {
   const keys = Reflect.ownKeys(source);
   for (let i = 0; i < keys.length; ++i) {

test/api/from-file.js

@@ -2,6 +2,7 @@
 const path = require("path");
 const { assert } = require("chai");
 const { describe, it } = require("mocha-sugar-free");
+const { pathToFileURL } = require("url");
 
 const { JSDOM } = require("../..");
 
@@ -81,12 +82,7 @@ describe("API: JSDOM.fromFile()", () => {
   });
 
   describe("url option defaulting", () => {
-    // Manually construct it as much as possible to avoid logic in the tests
-    let pathWithLeadingSlash = path.resolve(__dirname);
-    if (!pathWithLeadingSlash.startsWith("/")) {
-      pathWithLeadingSlash = "/" + pathWithLeadingSlash;
-    }
-    const testURL = "file://" + pathWithLeadingSlash.replace(/\\/g, "/") + "/fixtures/from-file/test.html";
+    const testURL = pathToFileURL(path.resolve(__dirname, "fixtures/from-file/test.html")).href;
 
     it("should default to a file URL derived from the filename", () => {
       return fromFixtureFile("test.html").then(dom => {

test/util.js

@@ -6,6 +6,7 @@ const https = require("https");
 const enableDestroy = require("server-destroy");
 const { JSDOM } = require("..");
 const { Canvas } = require("../lib/jsdom/utils");
+const { pathToFileURL } = require("url");
 
 function toPathname(dirname, relativePath) {
   let pathname = path.resolve(dirname, relativePath).replace(/\\/g, "/");
@@ -15,13 +16,9 @@ function toPathname(dirname, relativePath) {
   return pathname;
 }
 
-function toFileUrl(dirname, relativePath) {
-  return "file://" + toPathname(dirname, relativePath);
-}
-
 exports.toFileUrl = dirname => {
   return function (relativePath) {
-    return toFileUrl(dirname, relativePath);
+    return pathToFileURL(path.resolve(dirname, relativePath)).href;
   };
 };
 
@@ -38,7 +35,7 @@ exports.load = dirname => {
     const file = path.resolve(dirname, "files/" + name + ".html");
 
     if (!options.url) {
-      options.url = toFileUrl(dirname, file);
+      options.url = pathToFileURL(path.resolve(dirname, file)).href;
     }
 
     const contents = fileCache[file] || fs.readFileSync(file, "utf8");