Add m-esr52 at 52.6.0

1 files changed, 1105 insertions, 0 deletions

diff --git a/toolkit/modules/tests/xpcshell/test_Promise.js b/toolkit/modules/tests/xpcshell/test_Promise.js
new file mode 100644
index 000000000..6c7220692
--- /dev/null
+++ b/toolkit/modules/tests/xpcshell/test_Promise.js
@@ -0,0 +1,1105 @@
+/* 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);
+}