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diff --git a/comm/mailnews/mime/jsmime/test/unit/head_xpcshell_glue.js b/comm/mailnews/mime/jsmime/test/unit/head_xpcshell_glue.js
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index 0000000000..6f7fca89f1
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+++ b/comm/mailnews/mime/jsmime/test/unit/head_xpcshell_glue.js
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+// This file needs to contain glue to rephrase the Mocha testsuite framework in
+// a way that the xpcshell test suite can understand.
+
+var { Assert } = ChromeUtils.importESModule(
+  "resource://testing-common/Assert.sys.mjs"
+);
+var requireCache = new Map();
+
+// Preload an assert module
+var assert = new Assert();
+assert.doesNotThrow = function (block, message) {
+  message = message ? " " + message : ".";
+  try {
+    block();
+  } catch (e) {
+    this.report(true, e, null, "Got unwanted exception" + message);
+  }
+};
+requireCache.set("assert", assert);
+
+// Preload an fs module
+var fs = {
+  readFile(filename, options, callback) {
+    if (callback === undefined) {
+      callback = options;
+      options = {};
+    }
+
+    // Convert according to encoding. For the moment, we don't support this
+    // node.js feature in the shim since we don't need to.
+    var translator = contents => contents;
+    if (options !== undefined && "encoding" in options) {
+      translator = function () {
+        throw new Error("I can't do this!");
+      };
+    }
+
+    Promise.resolve(filename)
+      .then(do_get_file)
+      .then(file => IOUtils.read(file.path))
+      .then(translator)
+      .then(contents => callback(undefined, contents), callback);
+  },
+};
+requireCache.set("fs", fs);
+var { jsmime } = ChromeUtils.import("resource:///modules/jsmime.jsm");
+requireCache.set("jsmime", jsmime);
+
+function require(path) {
+  if (requireCache.has(path)) {
+    return requireCache.get(path);
+  }
+
+  let file;
+  if (path.startsWith("test/")) {
+    let name = path.substring("test/".length);
+    file = "resource://testing-common/jsmime/" + name + ".js";
+  } else {
+    file = "resource:///modules/jsmime/" + path + ".js";
+  }
+
+  var globalObject = {
+    define: innerDefine.bind(this, path),
+  };
+  Services.scriptloader.loadSubScript(file, globalObject);
+  return requireCache.get(path);
+}
+
+function innerDefine(moduleName, dfn) {
+  if (typeof dfn !== "function") {
+    throw new Error("What is going on here?");
+  }
+  function resolvingRequire(path) {
+    if (path.startsWith("./")) {
+      path = path.substring(2);
+    }
+    return require(path);
+  }
+  var result = dfn(resolvingRequire);
+  requireCache.set(moduleName, result);
+}
+
+var define = innerDefine.bind(this, "xpcshell-test");
+
+// Mocha TDD UI Bindings
+// ---------------------
+
+/**
+ * A block of tests, from the suite class.
+ */
+function MochaSuite(name) {
+  this.name = name;
+  this.setup = [];
+  this.tests = [];
+  this.teardown = [];
+  this.suites = [];
+}
+
+// The real code for running a suite of tests, written as async function.
+MochaSuite.prototype._runSuite = async function () {
+  info("Running suite " + this.name);
+  for (let setup_ of this.setup) {
+    await runFunction(setup_);
+  }
+  for (let test_ of this.tests) {
+    info("Running test " + test_.name);
+    await runFunction(test_.test);
+  }
+  for (let suite_ of this.suites) {
+    await suite_.runSuite();
+  }
+  for (let fn of this.teardown) {
+    await runFunction(fn);
+  }
+  info("Finished suite " + this.name);
+};
+
+// The outer call to run a test suite, which returns a promise of completion.
+MochaSuite.prototype.runSuite = function () {
+  return this._runSuite();
+};
+
+// Run the given function, returning a promise of when the test will complete.
+function runFunction(fn) {
+  let completed = new Promise(function (resolve, reject) {
+    function onEnd(error) {
+      if (error !== undefined) {
+        reject(error);
+      } else {
+        resolve();
+      }
+    }
+    // If the function is expecting an argument, that argument is the callback
+    // above. If it's not, then it may be returning a promise.
+    if (fn.length == 1) {
+      fn(onEnd);
+    } else {
+      // Promise.resolve nicely handles both promises and not-promise values for
+      // us.
+      resolve(fn());
+    }
+  });
+  return completed;
+}
+
+var currentSuite = new MochaSuite("");
+function suite(name, tests) {
+  name = name.toString();
+  if (/[\x80-]/.exec(name)) {
+    name = "<unprintable name>";
+  }
+  let suiteParent = currentSuite;
+  currentSuite = new MochaSuite(name);
+  suiteParent.suites.push(currentSuite);
+  tests();
+  currentSuite = suiteParent;
+}
+function test(name, block) {
+  name = name.toString();
+  if (/[\x80-]/.exec(name)) {
+    name = "<unprintable name>";
+  }
+  currentSuite.tests.push({ name, test: block });
+}
+function setup(block) {
+  currentSuite.setup.push(block);
+}
+function teardown(block) {
+  currentSuite.teardown.push(block);
+}
+
+// The actual binding xpcshell needs to do its work.
+function run_test() {
+  add_task(() => currentSuite.runSuite());
+  run_next_test();
+}