Merge branch 'redwood' into 28.9-platform

1 files changed, 0 insertions, 1105 deletions

diff --git a/toolkit/modules/tests/xpcshell/test_Promise.js b/toolkit/modules/tests/xpcshell/test_Promise.js
deleted file mode 100644
index 6c7220692..000000000
--- a/toolkit/modules/tests/xpcshell/test_Promise.js
+++ /dev/null
@@ -1,1105 +0,0 @@
-/* Any copyright is dedicated to the Public Domain.
- * http://creativecommons.org/publicdomain/zero/1.0/ */
-"use strict";
-
-Components.utils.import("resource://gre/modules/Promise.jsm");
-Components.utils.import("resource://gre/modules/Services.jsm");
-Components.utils.import("resource://gre/modules/Task.jsm");
-Components.utils.import("resource://testing-common/PromiseTestUtils.jsm");
-
-// Prevent test failures due to the unhandled rejections in this test file.
-PromiseTestUtils.disableUncaughtRejectionObserverForSelfTest();
-
-// Test runner
-
-var run_promise_tests = function run_promise_tests(tests, cb) {
-  let loop = function loop(index) {
-    if (index >= tests.length) {
-      if (cb) {
-        cb.call();
-      }
-      return;
-    }
-    do_print("Launching test " + (index + 1) + "/" + tests.length);
-    let test = tests[index];
-    // Execute from an empty stack
-    let next = function next() {
-      do_print("Test " + (index + 1) + "/" + tests.length + " complete");
-      do_execute_soon(function() {
-        loop(index + 1);
-      });
-    };
-    let result = test();
-    result.then(next, next);
-  };
-  return loop(0);
-};
-
-var make_promise_test = function(test) {
-  return function runtest() {
-    do_print("Test starting: " + test.name);
-    try {
-      let result = test();
-      if (result && "promise" in result) {
-        result = result.promise;
-      }
-      if (!result || !("then" in result)) {
-        let exn;
-        try {
-          do_throw("Test " + test.name + " did not return a promise: " + result);
-        } catch (x) {
-          exn = x;
-        }
-        return Promise.reject(exn);
-      }
-      // The test returns a promise
-      result = result.then(
-        // Test complete
-        function onResolve() {
-          do_print("Test complete: " + test.name);
-        },
-        // The test failed with an unexpected error
-        function onReject(err) {
-          let detail;
-          if (err && typeof err == "object" && "stack" in err) {
-            detail = err.stack;
-          } else {
-            detail = "(no stack)";
-          }
-          do_throw("Test " + test.name + " rejected with the following reason: "
-              + err + detail);
-      });
-      return result;
-    } catch (x) {
-      // The test failed because of an error outside of a promise
-      do_throw("Error in body of test " + test.name + ": " + x + " at " + x.stack);
-      return Promise.reject();
-    }
-  };
-};
-
-// Tests
-
-var tests = [];
-
-// Utility function to observe an failures in a promise
-// This function is useful if the promise itself is
-// not returned.
-var observe_failures = function observe_failures(promise) {
-  promise.catch(function onReject(reason) {
-    test.do_throw("Observed failure in test " + test + ": " + reason);
-  });
-};
-
-// Test that all observers are notified
-tests.push(make_promise_test(
-  function notification(test) {
-    // The size of the test
-    const SIZE = 10;
-    const RESULT = "this is an arbitrary value";
-
-    // Number of observers that yet need to be notified
-    let expected = SIZE;
-
-    // |true| once an observer has been notified
-    let notified = [];
-
-    // The promise observed
-    let source = Promise.defer();
-    let result = Promise.defer();
-
-    let install_observer = function install_observer(i) {
-      observe_failures(source.promise.then(
-        function onSuccess(value) {
-          do_check_true(!notified[i], "Ensuring that observer is notified at most once");
-          notified[i] = true;
-
-          do_check_eq(value, RESULT, "Ensuring that the observed value is correct");
-          if (--expected == 0) {
-            result.resolve();
-          }
-        }));
-    };
-
-    // Install a number of observers before resolving
-    let i;
-    for (i = 0; i < SIZE/2; ++i) {
-      install_observer(i);
-    }
-
-    source.resolve(RESULT);
-
-    // Install remaining observers
-    for (;i < SIZE; ++i) {
-      install_observer(i);
-    }
-
-    return result;
-  }));
-
-// Test that observers get the correct "this" value in strict mode.
-tests.push(
-  make_promise_test(function handlers_this_value(test) {
-    return Promise.resolve().then(
-      function onResolve() {
-        // Since this file is in strict mode, the correct value is "undefined".
-        do_check_eq(this, undefined);
-        throw "reject";
-      }
-    ).then(
-      null,
-      function onReject() {
-        // Since this file is in strict mode, the correct value is "undefined".
-        do_check_eq(this, undefined);
-      }
-    );
-  }));
-
-// Test that observers registered on a pending promise are notified in order.
-tests.push(
-  make_promise_test(function then_returns_before_callbacks(test) {
-    let deferred = Promise.defer();
-    let promise = deferred.promise;
-
-    let order = 0;
-
-    promise.then(
-      function onResolve() {
-        do_check_eq(order, 0);
-        order++;
-      }
-    );
-
-    promise.then(
-      function onResolve() {
-        do_check_eq(order, 1);
-        order++;
-      }
-    );
-
-    let newPromise = promise.then(
-      function onResolve() {
-        do_check_eq(order, 2);
-      }
-    );
-
-    deferred.resolve();
-
-    // This test finishes after the last handler succeeds.
-    return newPromise;
-  }));
-
-// Test that observers registered on a resolved promise are notified in order.
-tests.push(
-  make_promise_test(function then_returns_before_callbacks(test) {
-    let promise = Promise.resolve();
-
-    let order = 0;
-
-    promise.then(
-      function onResolve() {
-        do_check_eq(order, 0);
-        order++;
-      }
-    );
-
-    promise.then(
-      function onResolve() {
-        do_check_eq(order, 1);
-        order++;
-      }
-    );
-
-    // This test finishes after the last handler succeeds.
-    return promise.then(
-      function onResolve() {
-        do_check_eq(order, 2);
-      }
-    );
-  }));
-
-// Test that all observers are notified at most once, even if source
-// is resolved/rejected several times
-tests.push(make_promise_test(
-  function notification_once(test) {
-    // The size of the test
-    const SIZE = 10;
-    const RESULT = "this is an arbitrary value";
-
-    // Number of observers that yet need to be notified
-    let expected = SIZE;
-
-    // |true| once an observer has been notified
-    let notified = [];
-
-    // The promise observed
-    let observed = Promise.defer();
-    let result = Promise.defer();
-
-    let install_observer = function install_observer(i) {
-      observe_failures(observed.promise.then(
-        function onSuccess(value) {
-          do_check_true(!notified[i], "Ensuring that observer is notified at most once");
-          notified[i] = true;
-
-          do_check_eq(value, RESULT, "Ensuring that the observed value is correct");
-          if (--expected == 0) {
-            result.resolve();
-          }
-        }));
-    };
-
-    // Install a number of observers before resolving
-    let i;
-    for (i = 0; i < SIZE/2; ++i) {
-      install_observer(i);
-    }
-
-    observed.resolve(RESULT);
-
-    // Install remaining observers
-    for (;i < SIZE; ++i) {
-      install_observer(i);
-    }
-
-    // Resolve some more
-    for (i = 0; i < 10; ++i) {
-      observed.resolve(RESULT);
-      observed.reject();
-    }
-
-    return result;
-  }));
-
-// Test that throwing an exception from a onResolve listener
-// does not prevent other observers from receiving the notification
-// of success.
-tests.push(
-  make_promise_test(function exceptions_do_not_stop_notifications(test)  {
-    let source = Promise.defer();
-
-    let exception_thrown = false;
-    let exception_content = new Error("Boom!");
-
-    let observer_1 = source.promise.then(
-      function onResolve() {
-        exception_thrown = true;
-        throw exception_content;
-      });
-
-    let observer_2 = source.promise.then(
-      function onResolve() {
-        do_check_true(exception_thrown, "Second observer called after first observer has thrown");
-      }
-    );
-
-    let result = observer_1.then(
-      function onResolve() {
-        do_throw("observer_1 should not have resolved");
-      },
-      function onReject(reason) {
-        do_check_true(reason == exception_content, "Obtained correct rejection");
-      }
-    );
-
-    source.resolve();
-    return result;
-  }
-));
-
-// Test that, once a promise is resolved, further resolve/reject
-// are ignored.
-tests.push(
-  make_promise_test(function subsequent_resolves_are_ignored(test) {
-    let deferred = Promise.defer();
-    deferred.resolve(1);
-    deferred.resolve(2);
-    deferred.reject(3);
-
-    let result = deferred.promise.then(
-      function onResolve(value) {
-        do_check_eq(value, 1, "Resolution chose the first value");
-      },
-      function onReject(reason) {
-        do_throw("Obtained a rejection while the promise was already resolved");
-      }
-    );
-
-    return result;
-  }));
-
-// Test that, once a promise is rejected, further resolve/reject
-// are ignored.
-tests.push(
-  make_promise_test(function subsequent_rejects_are_ignored(test) {
-    let deferred = Promise.defer();
-    deferred.reject(1);
-    deferred.reject(2);
-    deferred.resolve(3);
-
-    let result = deferred.promise.then(
-      function onResolve() {
-        do_throw("Obtained a resolution while the promise was already rejected");
-      },
-      function onReject(reason) {
-        do_check_eq(reason, 1, "Rejection chose the first value");
-      }
-    );
-
-    return result;
-  }));
-
-// Test that returning normally from a rejection recovers from the error
-// and that listeners are informed of a success.
-tests.push(
-  make_promise_test(function recovery(test) {
-    let boom = new Error("Boom!");
-    let deferred = Promise.defer();
-    const RESULT = "An arbitrary value";
-
-    let promise = deferred.promise.then(
-      function onResolve() {
-        do_throw("A rejected promise should not resolve");
-      },
-      function onReject(reason) {
-        do_check_true(reason == boom, "Promise was rejected with the correct error");
-        return RESULT;
-      }
-    );
-
-    promise = promise.then(
-      function onResolve(value) {
-        do_check_eq(value, RESULT, "Promise was recovered with the correct value");
-      }
-    );
-
-    deferred.reject(boom);
-    return promise;
-  }));
-
-// Test that returning a resolved promise from a onReject causes a resolution
-// (recovering from the error) and that returning a rejected promise
-// from a onResolve listener causes a rejection (raising an error).
-tests.push(
-  make_promise_test(function recovery_with_promise(test) {
-    let boom = new Error("Arbitrary error");
-    let deferred = Promise.defer();
-    const RESULT = "An arbitrary value";
-    const boom2 = new Error("Another arbitrary error");
-
-    // return a resolved promise from a onReject listener
-    let promise = deferred.promise.then(
-      function onResolve() {
-        do_throw("A rejected promise should not resolve");
-      },
-      function onReject(reason) {
-        do_check_true(reason == boom, "Promise was rejected with the correct error");
-        return Promise.resolve(RESULT);
-      }
-    );
-
-    // return a rejected promise from a onResolve listener
-    promise = promise.then(
-      function onResolve(value) {
-        do_check_eq(value, RESULT, "Promise was recovered with the correct value");
-        return Promise.reject(boom2);
-      }
-    );
-
-    promise = promise.catch(
-      function onReject(reason) {
-        do_check_eq(reason, boom2, "Rejection was propagated with the correct " +
-                "reason, through a promise");
-      }
-    );
-
-    deferred.reject(boom);
-    return promise;
-  }));
-
-// Test that we can resolve with promises of promises
-tests.push(
-  make_promise_test(function test_propagation(test) {
-    const RESULT = "Yet another arbitrary value";
-    let d1 = Promise.defer();
-    let d2 = Promise.defer();
-    let d3 = Promise.defer();
-
-    d3.resolve(d2.promise);
-    d2.resolve(d1.promise);
-    d1.resolve(RESULT);
-
-    return d3.promise.then(
-      function onSuccess(value) {
-        do_check_eq(value, RESULT, "Resolution with a promise eventually yielded "
-                + " the correct result");
-      }
-    );
-  }));
-
-// Test sequences of |then| and |catch|
-tests.push(
-  make_promise_test(function test_chaining(test) {
-    let error_1 = new Error("Error 1");
-    let error_2 = new Error("Error 2");
-    let result_1 = "First result";
-    let result_2 = "Second result";
-    let result_3 = "Third result";
-
-    let source = Promise.defer();
-
-    let promise = source.promise.then().then();
-
-    source.resolve(result_1);
-
-    // Check that result_1 is correctly propagated
-    promise = promise.then(
-      function onSuccess(result) {
-        do_check_eq(result, result_1, "Result was propagated correctly through " +
-                " several applications of |then|");
-        return result_2;
-      }
-    );
-
-    // Check that returning from the promise produces a resolution
-    promise = promise.catch(
-      function onReject() {
-        do_throw("Incorrect rejection");
-      }
-    );
-
-    // ... and that the check did not alter the value
-    promise = promise.then(
-      function onResolve(value) {
-        do_check_eq(value, result_2, "Result was propagated correctly once again");
-      }
-    );
-
-    // Now the same kind of tests for rejections
-    promise = promise.then(
-      function onResolve() {
-        throw error_1;
-      }
-    );
-
-    promise = promise.then(
-      function onResolve() {
-        do_throw("Incorrect resolution: the exception should have caused a rejection");
-      }
-    );
-
-    promise = promise.catch(
-      function onReject(reason) {
-        do_check_true(reason == error_1, "Reason was propagated correctly");
-        throw error_2;
-      }
-    );
-
-    promise = promise.catch(
-      function onReject(reason) {
-        do_check_true(reason == error_2, "Throwing an error altered the reason " +
-            "as expected");
-        return result_3;
-      }
-    );
-
-    promise = promise.then(
-      function onResolve(result) {
-        do_check_eq(result, result_3, "Error was correctly recovered");
-      }
-    );
-
-    return promise;
-  }));
-
-// Test that resolving with a rejected promise actually rejects
-tests.push(
-  make_promise_test(function resolve_to_rejected(test) {
-    let source = Promise.defer();
-    let error = new Error("Boom");
-
-    let promise = source.promise.then(
-      function onResolve() {
-        do_throw("Incorrect call to onResolve listener");
-      },
-      function onReject(reason) {
-        do_check_eq(reason, error, "Rejection lead to the expected reason");
-      }
-    );
-
-    source.resolve(Promise.reject(error));
-
-    return promise;
-  }));
-
-// Test that Promise.resolve resolves as expected
-tests.push(
-  make_promise_test(function test_resolve(test) {
-    const RESULT = "arbitrary value";
-    let p1 = Promise.resolve(RESULT);
-    let p2 = Promise.resolve(p1);
-    do_check_eq(p1, p2, "Promise.resolve used on a promise just returns the promise");
-
-    return p1.then(
-      function onResolve(result) {
-        do_check_eq(result, RESULT, "Promise.resolve propagated the correct result");
-      }
-    );
-  }));
-
-// Test that Promise.resolve throws when its argument is an async function.
-tests.push(
-  make_promise_test(function test_promise_resolve_throws_with_async_function(test) {
-    Assert.throws(() => Promise.resolve(Task.async(function* () {})),
-                  /Cannot resolve a promise with an async function/);
-    return Promise.resolve();
-  }));
-
-// Test that the code after "then" is always executed before the callbacks
-tests.push(
-  make_promise_test(function then_returns_before_callbacks(test) {
-    let promise = Promise.resolve();
-
-    let thenExecuted = false;
-
-    promise = promise.then(
-      function onResolve() {
-        thenExecuted = true;
-      }
-    );
-
-    do_check_false(thenExecuted);
-
-    return promise;
-  }));
-
-// Test that chaining promises does not generate long stack traces
-tests.push(
-  make_promise_test(function chaining_short_stack(test) {
-    let source = Promise.defer();
-    let promise = source.promise;
-
-    const NUM_ITERATIONS = 100;
-
-    for (let i = 0; i < NUM_ITERATIONS; i++) {
-      promise = promise.then(
-        function onResolve(result) {
-          return result + ".";
-        }
-      );
-    }
-
-    promise = promise.then(
-      function onResolve(result) {
-        // Check that the execution went as expected.
-        let expectedString = new Array(1 + NUM_ITERATIONS).join(".");
-        do_check_true(result == expectedString);
-
-        // Check that we didn't generate one or more stack frames per iteration.
-        let stackFrameCount = 0;
-        let stackFrame = Components.stack;
-        while (stackFrame) {
-          stackFrameCount++;
-          stackFrame = stackFrame.caller;
-        }
-
-        do_check_true(stackFrameCount < NUM_ITERATIONS);
-      }
-    );
-
-    source.resolve("");
-
-    return promise;
-  }));
-
-// Test that the values of the promise return by Promise.all() are kept in the
-// given order even if the given promises are resolved in arbitrary order
-tests.push(
-  make_promise_test(function all_resolve(test) {
-    let d1 = Promise.defer();
-    let d2 = Promise.defer();
-    let d3 = Promise.defer();
-
-    d3.resolve(4);
-    d2.resolve(2);
-    do_execute_soon(() => d1.resolve(1));
-
-    let promises = [d1.promise, d2.promise, 3, d3.promise];
-
-    return Promise.all(promises).then(
-      function onResolve([val1, val2, val3, val4]) {
-        do_check_eq(val1, 1);
-        do_check_eq(val2, 2);
-        do_check_eq(val3, 3);
-        do_check_eq(val4, 4);
-      }
-    );
-  }));
-
-// Test that rejecting one of the promises passed to Promise.all()
-// rejects the promise return by Promise.all()
-tests.push(
-  make_promise_test(function all_reject(test) {
-    let error = new Error("Boom");
-
-    let d1 = Promise.defer();
-    let d2 = Promise.defer();
-    let d3 = Promise.defer();
-
-    d3.resolve(3);
-    d2.resolve(2);
-    do_execute_soon(() => d1.reject(error));
-
-    let promises = [d1.promise, d2.promise, d3.promise];
-
-    return Promise.all(promises).then(
-      function onResolve() {
-        do_throw("Incorrect call to onResolve listener");
-      },
-      function onReject(reason) {
-        do_check_eq(reason, error, "Rejection lead to the expected reason");
-      }
-    );
-  }));
-
-// Test that passing only values (not promises) to Promise.all()
-// forwards them all as resolution values.
-tests.push(
-  make_promise_test(function all_resolve_no_promises(test) {
-    try {
-      Promise.all(null);
-      do_check_true(false, "all() should only accept iterables");
-    } catch (e) {
-      do_check_true(true, "all() fails when first the arg is not an iterable");
-    }
-
-    let p1 = Promise.all([]).then(
-      function onResolve(val) {
-        do_check_true(Array.isArray(val) && val.length == 0);
-      }
-    );
-
-    let p2 = Promise.all([1, 2, 3]).then(
-      function onResolve([val1, val2, val3]) {
-        do_check_eq(val1, 1);
-        do_check_eq(val2, 2);
-        do_check_eq(val3, 3);
-      }
-    );
-
-    return Promise.all([p1, p2]);
-  }));
-
-// Test that Promise.all() handles non-array iterables
-tests.push(
-  make_promise_test(function all_iterable(test) {
-    function* iterable() {
-      yield 1;
-      yield 2;
-      yield 3;
-    }
-
-    return Promise.all(iterable()).then(
-      function onResolve([val1, val2, val3]) {
-        do_check_eq(val1, 1);
-        do_check_eq(val2, 2);
-        do_check_eq(val3, 3);
-      },
-      function onReject() {
-        do_throw("all() unexpectedly rejected");
-      }
-    );
-  }));
-
-// Test that throwing from the iterable passed to Promise.all() rejects the
-// promise returned by Promise.all()
-tests.push(
-  make_promise_test(function all_iterable_throws(test) {
-    function* iterable() {
-      throw 1;
-    }
-
-    return Promise.all(iterable()).then(
-      function onResolve() {
-        do_throw("all() unexpectedly resolved");
-      },
-      function onReject(reason) {
-        do_check_eq(reason, 1, "all() rejects when the iterator throws");
-      }
-    );
-  }));
-
-// Test that Promise.race() resolves with the first available resolution value
-tests.push(
-  make_promise_test(function race_resolve(test) {
-    let p1 = Promise.resolve(1);
-    let p2 = Promise.resolve().then(() => 2);
-
-    return Promise.race([p1, p2]).then(
-      function onResolve(value) {
-        do_check_eq(value, 1);
-      }
-    );
-  }));
-
-// Test that passing only values (not promises) to Promise.race() works
-tests.push(
-  make_promise_test(function race_resolve_no_promises(test) {
-    try {
-      Promise.race(null);
-      do_check_true(false, "race() should only accept iterables");
-    } catch (e) {
-      do_check_true(true, "race() fails when first the arg is not an iterable");
-    }
-
-    return Promise.race([1, 2, 3]).then(
-      function onResolve(value) {
-        do_check_eq(value, 1);
-      }
-    );
-  }));
-
-// Test that Promise.race() never resolves when passed an empty iterable
-tests.push(
-  make_promise_test(function race_resolve_never(test) {
-    return new Promise(resolve => {
-      Promise.race([]).then(
-        function onResolve() {
-          do_throw("race() unexpectedly resolved");
-        },
-        function onReject() {
-          do_throw("race() unexpectedly rejected");
-        }
-      );
-
-      // Approximate "never" so we don't have to solve the halting problem.
-      do_timeout(200, resolve);
-    });
-  }));
-
-// Test that Promise.race() handles non-array iterables.
-tests.push(
-  make_promise_test(function race_iterable(test) {
-    function* iterable() {
-      yield 1;
-      yield 2;
-      yield 3;
-    }
-
-    return Promise.race(iterable()).then(
-      function onResolve(value) {
-        do_check_eq(value, 1);
-      },
-      function onReject() {
-        do_throw("race() unexpectedly rejected");
-      }
-    );
-  }));
-
-// Test that throwing from the iterable passed to Promise.race() rejects the
-// promise returned by Promise.race()
-tests.push(
-  make_promise_test(function race_iterable_throws(test) {
-    function* iterable() {
-      throw 1;
-    }
-
-    return Promise.race(iterable()).then(
-      function onResolve() {
-        do_throw("race() unexpectedly resolved");
-      },
-      function onReject(reason) {
-        do_check_eq(reason, 1, "race() rejects when the iterator throws");
-      }
-    );
-  }));
-
-// Test that rejecting one of the promises passed to Promise.race() rejects the
-// promise returned by Promise.race()
-tests.push(
-  make_promise_test(function race_reject(test) {
-    let p1 = Promise.reject(1);
-    let p2 = Promise.resolve(2);
-    let p3 = Promise.resolve(3);
-
-    return Promise.race([p1, p2, p3]).then(
-      function onResolve() {
-        do_throw("race() unexpectedly resolved");
-      },
-      function onReject(reason) {
-        do_check_eq(reason, 1, "race() rejects when given a rejected promise");
-      }
-    );
-  }));
-
-// Test behavior of the Promise constructor.
-tests.push(
-  make_promise_test(function test_constructor(test) {
-    try {
-      new Promise(null);
-      do_check_true(false, "Constructor should fail when not passed a function");
-    } catch (e) {
-      do_check_true(true, "Constructor fails when not passed a function");
-    }
-
-    let executorRan = false;
-    let promise = new Promise(
-      function executor(resolve, reject) {
-        executorRan = true;
-        do_check_eq(this, undefined);
-        do_check_eq(typeof resolve, "function",
-                    "resolve function should be passed to the executor");
-        do_check_eq(typeof reject, "function",
-                    "reject function should be passed to the executor");
-      }
-    );
-    do_check_instanceof(promise, Promise);
-    do_check_true(executorRan, "Executor should execute synchronously");
-
-    // resolve a promise from the executor
-    let resolvePromise = new Promise(
-      function executor(resolve) {
-        resolve(1);
-      }
-    ).then(
-      function onResolve(value) {
-        do_check_eq(value, 1, "Executor resolved with correct value");
-      },
-      function onReject() {
-        do_throw("Executor unexpectedly rejected");
-      }
-    );
-
-    // reject a promise from the executor
-    let rejectPromise = new Promise(
-      function executor(_, reject) {
-        reject(1);
-      }
-    ).then(
-      function onResolve() {
-        do_throw("Executor unexpectedly resolved");
-      },
-      function onReject(reason) {
-        do_check_eq(reason, 1, "Executor rejected with correct value");
-      }
-    );
-
-    // throw from the executor, causing a rejection
-    let throwPromise = new Promise(
-      function executor() {
-        throw 1;
-      }
-    ).then(
-      function onResolve() {
-        do_throw("Throwing inside an executor should not resolve the promise");
-      },
-      function onReject(reason) {
-        do_check_eq(reason, 1, "Executor rejected with correct value");
-      }
-    );
-
-    return Promise.all([resolvePromise, rejectPromise, throwPromise]);
-  }));
-
-// Test deadlock in Promise.jsm with nested event loops
-// The scenario being tested is:
-// promise_1.then({
-//   do some work that will asynchronously signal done
-//   start an event loop waiting for the done signal
-// }
-// where the async work uses resolution of a second promise to
-// trigger the "done" signal. While this would likely work in a
-// naive implementation, our constant-stack implementation needs
-// a special case to avoid deadlock. Note that this test is
-// sensitive to the implementation-dependent order in which then()
-// clauses for two different promises are executed, so it is
-// possible for other implementations to pass this test and still
-// have similar deadlocks.
-tests.push(
-  make_promise_test(function promise_nested_eventloop_deadlock(test) {
-    // Set up a (long enough to be noticeable) timeout to
-    // exit the nested event loop and throw if the test run is hung
-    let shouldExitNestedEventLoop = false;
-
-    function event_loop() {
-      let thr = Services.tm.mainThread;
-      while (!shouldExitNestedEventLoop) {
-        thr.processNextEvent(true);
-      }
-    }
-
-    // I wish there was a way to cancel xpcshell do_timeout()s
-    do_timeout(2000, () => {
-      if (!shouldExitNestedEventLoop) {
-        shouldExitNestedEventLoop = true;
-        do_throw("Test timed out");
-      }
-    });
-
-    let promise1 = Promise.resolve(1);
-    let promise2 = Promise.resolve(2);
-
-    do_print("Setting wait for first promise");
-    promise1.then(value => {
-      do_print("Starting event loop");
-      event_loop();
-    }, null);
-
-    do_print("Setting wait for second promise");
-    return promise2.catch(error => { return 3; })
-    .then(
-      count => {
-        shouldExitNestedEventLoop = true;
-      });
-  }));
-
-function wait_for_uncaught(aMustAppear, aTimeout = undefined) {
-  let remaining = new Set();
-  for (let k of aMustAppear) {
-    remaining.add(k);
-  }
-  let deferred = Promise.defer();
-  let print = do_print;
-  let execute_soon = do_execute_soon;
-  let observer = function({message, stack}) {
-    let data = message + stack;
-    print("Observing " + message + ", looking for " + aMustAppear.join(", "));
-    for (let expected of remaining) {
-      if (data.indexOf(expected) != -1) {
-        print("I found " + expected);
-        remaining.delete(expected);
-      }
-      if (remaining.size == 0 && observer) {
-        Promise.Debugging.removeUncaughtErrorObserver(observer);
-        observer = null;
-        deferred.resolve();
-      }
-    }
-  };
-  Promise.Debugging.addUncaughtErrorObserver(observer);
-  if (aTimeout) {
-    do_timeout(aTimeout, function timeout() {
-      if (observer) {
-        Promise.Debugging.removeUncaughtErrorObserver(observer);
-        observer = null;
-      }
-      deferred.reject(new Error("Timeout"));
-    });
-  }
-  return deferred.promise;
-}
-
-// Test that uncaught errors are reported as uncaught
-(function() {
-  let make_string_rejection = function make_string_rejection() {
-    let salt = (Math.random() * ( Math.pow(2, 24) - 1 ));
-    let string = "This is an uncaught rejection " + salt;
-    // Our error is not Error-like nor an nsIException, so the stack will
-    // include the closure doing the actual rejection.
-    return {mustFind: ["test_rejection_closure", string], error: string};
-  };
-  let make_num_rejection = function make_num_rejection() {
-    let salt = (Math.random() * ( Math.pow(2, 24) - 1 ));
-    // Our error is not Error-like nor an nsIException, so the stack will
-    // include the closure doing the actual rejection.
-    return {mustFind: ["test_rejection_closure", salt], error: salt};
-  };
-  let make_undefined_rejection = function make_undefined_rejection() {
-    // Our error is not Error-like nor an nsIException, so the stack will
-    // include the closure doing the actual rejection.
-    return {mustFind: ["test_rejection_closure"], error: undefined};
-  };
-  let make_error_rejection = function make_error_rejection() {
-    let salt = (Math.random() * ( Math.pow(2, 24) - 1 ));
-    let error = new Error("This is an uncaught error " + salt);
-    return {
-      mustFind: [error.message, error.fileName, error.lineNumber, error.stack],
-      error: error
-    };
-  };
-  let make_exception_rejection = function make_exception_rejection() {
-    let salt = (Math.random() * ( Math.pow(2, 24) - 1 ));
-    let exn = new Components.Exception("This is an uncaught exception " + salt,
-                                       Components.results.NS_ERROR_NOT_AVAILABLE);
-    return {
-      mustFind: [exn.message, exn.filename, exn.lineNumber, exn.location.toString()],
-      error: exn
-    };
-  };
-  for (let make_rejection of [make_string_rejection,
-    make_num_rejection,
-    make_undefined_rejection,
-    make_error_rejection,
-    make_exception_rejection]) {
-      let {mustFind, error} = make_rejection();
-      let name = make_rejection.name;
-      tests.push(make_promise_test(function test_uncaught_is_reported() {
-        do_print("Testing with rejection " + name);
-        let promise = wait_for_uncaught(mustFind);
-        (function test_rejection_closure() {
-          // For the moment, we cannot be absolutely certain that a value is
-          // garbage-collected, even if it is not referenced anymore, due to
-          // the conservative stack-scanning algorithm.
-          //
-          // To be _almost_ certain that a value will be garbage-collected, we
-          // 1. isolate that value in an anonymous closure;
-          // 2. allocate 100 values instead of 1 (gc-ing a single value from
-          //    these is sufficient for the test);
-          // 3. place everything in a loop, as the JIT typically reuses memory;
-          // 4. call all the GC methods we can.
-          //
-          // Unfortunately, we might still have intermittent failures,
-          // materialized as timeouts.
-          //
-          for (let i = 0; i < 100; ++i) {
-            Promise.reject(error);
-          }
-        })();
-        do_print("Posted all rejections");
-        Components.utils.forceGC();
-        Components.utils.forceCC();
-        Components.utils.forceShrinkingGC();
-        return promise;
-      }));
-  }
-})();
-
-
-// Test that caught errors are not reported as uncaught
-tests.push(
-make_promise_test(function test_caught_is_not_reported() {
-  let salt = (Math.random() * ( Math.pow(2, 24) - 1 ));
-  let promise = wait_for_uncaught([salt], 500);
-  (function() {
-    let uncaught = Promise.reject("This error, on the other hand, is caught " + salt);
-    uncaught.catch(function() { /* ignore rejection */ });
-    uncaught = null;
-  })();
-  // Isolate this in a function to increase likelihood that the gc will
-  // realise that |uncaught| has remained uncaught.
-  Components.utils.forceGC();
-
-  return promise.then(function onSuccess() {
-    throw new Error("This error was caught and should not have been reported");
-  }, function onError() {
-    do_print("The caught error was not reported, all is fine");
-  }
-  );
-}));
-
-// Bug 1033406 - Make sure Promise works even after freezing.
-tests.push(
-  make_promise_test(function test_freezing_promise(test) {
-    var p = new Promise(function executor(resolve) {
-      do_execute_soon(resolve);
-    });
-    Object.freeze(p);
-    return p;
-  })
-);
-
-function run_test()
-{
-  do_test_pending();
-  run_promise_tests(tests, do_test_finished);
-}