v8/test/mjsunit/harmony/async-function-stacktrace.js

// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --harmony-async-await

async function test(func, funcs) {
  try {
    await func();
    throw new Error("Expected " + func.toString() + " to throw");
  } catch (e) {
    var stack = e.stack.split('\n').
        slice(1).
        map(line => line.trim()).
        map(line => line.match(/at (?:(.*) )?.*$/)[1]).
        filter(x => typeof x === 'string' && x.length);

    assertEquals(funcs, stack, `Unexpected stack trace ${e.stack}`);
  }
}

function thrower() { throw new Error("NOPE"); }
function reject() { return Promise.reject(new Error("NOPE")); }

async function runTests() {
  await test(async function a() {
    throw new Error("FAIL");
  },
  ["a", "test", "runTests"]);

  await test(async function a2() {
    await 1;
    throw new Error("FAIL");
  }, ["a2"]);

  await test(async function a3() {
    await 1;
    try { await thrower(); } catch (e) { throw new Error("FAIL"); }
  }, ["a3"]);

  await test(async function a4() {
    await 1;
    try { await reject(); } catch (e) { throw new Error("FAIL"); }
  }, ["a4"]);

  await test({ async b() {
    throw new Error("FAIL");
  }}.b,
  ["b", "test", "runTests"]);

  await test({ async b2() {
    await 1;
    throw new Error("FAIL");
  }}.b2, ["b2"]);

  await test({ async b3() {
    await 1;
    try { await thrower(); } catch (e) { throw new Error("FAIL"); }
  } }.b3, ["b3"]);

  await test({ async b4() {
    await 1;
    try { await reject(); } catch (e) { throw new Error("FAIL"); }
  } }.b4, ["b4"]);

  await test((new class { async c() {
    throw new Error("FAIL");
  } }).c,
  ["c", "test", "runTests"]);

  await test((new class { async c2() {
    await 1;
    throw new Error("FAIL");
  } }).c2, ["c2"]);

  await test((new class { async c3() {
    await 1;
    try { await thrower(); } catch (e) { throw new Error("FAIL"); }
  } }).c3, ["c3"]);

  await test((new class { async c4() {
    await 1;
    try { await reject(); } catch (e) { throw new Error("FAIL"); }
  } }).c4, ["c4"]);

  // TODO(caitp): `async` probably shouldn't be the inferred name for async
  // arrow functions...
  await test(async() => { throw new Error("FAIL") },
  ["async", "test", "runTests"]);

  await test(async() => { await 1; throw new Error("FAIL") }, ["async"]);

  await test(async() => {
    await 1;
    try {
      await thrower();
    } catch (e) {
      throw new Error("FAIL");
    }
  }, ["e"]); // TODO(caitp): FuncNameInferer is doing some weird stuff...

  await test(async() => {
    await 1;
    try {
      await reject();
    } catch (e) {
      throw new Error("FAIL");
    }
  }, ["e"]);
}

runTests().catch(e => {
  print(e);
  quit(1);
});