gecko-dev/dom/promise/tests/test_promise.html

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  <title>Basic Promise Test</title>
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function promiseResolve() {
  ok(Promise, "Promise object should exist");

  var promise = new Promise(function(resolve, reject) {
    ok(resolve, "Promise.resolve exists");
    ok(reject, "Promise.reject exists");

    resolve(42);
  }).then(function(what) {
    ok(true, "Then - resolveCb has been called");
    is(what, 42, "ResolveCb received 42");
    runTest();
  }, function() {
    ok(false, "Then - rejectCb has been called");
    runTest();
  });
}

function promiseResolveNoArg() {
  var promise = new Promise(function(resolve, reject) {
    ok(resolve, "Promise.resolve exists");
    ok(reject, "Promise.reject exists");

    resolve();
  }).then(function(what) {
    ok(true, "Then - resolveCb has been called");
    is(what, undefined, "ResolveCb received undefined");
    runTest();
  }, function() {
    ok(false, "Then - rejectCb has been called");
    runTest();
  });
}

function promiseReject() {
  var promise = new Promise(function(resolve, reject) {
    reject(42);
  }).then(function(what) {
    ok(false, "Then - resolveCb has been called");
    runTest();
  }, function(what) {
    ok(true, "Then - rejectCb has been called");
    is(what, 42, "RejectCb received 42");
    runTest();
  });
}

function promiseRejectNoHandler() {
  // This test only checks that the code that reports unhandled errors in the
  // Promises implementation does not crash or leak.
  var promise = new Promise(function(res, rej) {
    noSuchMethod();
  });
  runTest();
}

function promiseRejectNoArg() {
  var promise = new Promise(function(resolve, reject) {
    reject();
  }).then(function(what) {
    ok(false, "Then - resolveCb has been called");
    runTest();
  }, function(what) {
    ok(true, "Then - rejectCb has been called");
    is(what, undefined, "RejectCb received undefined");
    runTest();
  });
}

function promiseException() {
  var promise = new Promise(function(resolve, reject) {
    throw 42;
  }).then(function(what) {
    ok(false, "Then - resolveCb has been called");
    runTest();
  }, function(what) {
    ok(true, "Then - rejectCb has been called");
    is(what, 42, "RejectCb received 42");
    runTest();
  });
}

function promiseGC() {
  var resolve;
  var promise = new Promise(function(r1, r2) {
    resolve = r1;
  }).then(function(what) {
    ok(true, "Then - promise is still alive");
    runTest();
  });

  promise = null;

  SpecialPowers.gc();
  SpecialPowers.forceGC();
  SpecialPowers.forceCC();

  resolve(42);
}

function promiseAsync() {
  var global = "foo";
  var f = new Promise(function(r1, r2) {
    is(global, "foo", "Global should be foo");
    r1(42);
    is(global, "foo", "Global should still be foo");
    setTimeout(function() {
      is(global, "bar", "Global should still be bar!");
      runTest();
    }, 0);
  }).then(function() {
    global = "bar";
  });
  is(global, "foo", "Global should still be foo (2)");
}

function promiseDoubleThen() {
  var steps = 0;
  var promise = new Promise(function(r1, r2) {
    r1(42);
  });

  promise.then(function(what) {
    ok(true, "Then.resolve has been called");
    is(what, 42, "Value == 42");
    steps++;
  }, function(what) {
    ok(false, "Then.reject has been called");
  });

  promise.then(function(what) {
    ok(true, "Then.resolve has been called");
    is(steps, 1, "Then.resolve - step == 1");
    is(what, 42, "Value == 42");
    runTest();
  }, function(what) {
    ok(false, "Then.reject has been called");
  });
}

function promiseThenException() {
  var promise = new Promise(function(resolve, reject) {
    resolve(42);
  });

  promise.then(function(what) {
    ok(true, "Then.resolve has been called");
    throw "booh";
  }).catch(function(e) {
    ok(true, "window.onerror has been called!");
    runTest();
  });
}

function promiseThenCatchThen() {
  var promise = new Promise(function(resolve, reject) {
    resolve(42);
  });

  var promise2 = promise.then(function(what) {
    ok(true, "Then.resolve has been called");
    is(what, 42, "Value == 42");
    return what + 1;
  }, function(what) {
    ok(false, "Then.reject has been called");
  });

  isnot(promise, promise2, "These 2 promise objs are different");

  promise2.then(function(what) {
    ok(true, "Then.resolve has been called");
    is(what, 43, "Value == 43");
    return what + 1;
  }, function(what) {
    ok(false, "Then.reject has been called");
  }).catch(function() {
    ok(false, "Catch has been called");
  }).then(function(what) {
    ok(true, "Then.resolve has been called");
    is(what, 44, "Value == 44");
    runTest();
  }, function(what) {
    ok(false, "Then.reject has been called");
  });
}

function promiseThenNoArg() {
  var promise = new Promise(function(resolve, reject) {
    resolve(42);
  });

  var clone = promise.then();
  isnot(promise, clone, "These 2 promise objs are different");
  promise.then(function(v) {
    clone.then(function(cv) {
      is(v, cv, "Both resolve to the same value");
      runTest();
    });
  });
}

function promiseThenUndefinedResolveFunction() {
  var promise = new Promise(function(resolve, reject) {
    reject(42);
  });

  try {
    promise.then(undefined, function(v) {
      is(v, 42, "Promise rejected with 42");
      runTest();
    });
  } catch (e) {
    ok(false, "then should not throw on undefined resolve function");
  }
}

function promiseThenNullResolveFunction() {
  var promise = new Promise(function(resolve, reject) {
    reject(42);
  });

  try {
    promise.then(null, function(v) {
      is(v, 42, "Promise rejected with 42");
      runTest();
    });
  } catch (e) {
    ok(false, "then should not throw on null resolve function");
  }
}

function promiseRejectThenCatchThen() {
  var promise = new Promise(function(resolve, reject) {
    reject(42);
  });

  var promise2 = promise.then(function(what) {
    ok(false, "Then.resolve has been called");
  }, function(what) {
    ok(true, "Then.reject has been called");
    is(what, 42, "Value == 42");
    return what + 1;
  });

  isnot(promise, promise2, "These 2 promise objs are different");

  promise2.then(function(what) {
    ok(true, "Then.resolve has been called");
    is(what, 43, "Value == 43");
    return what+1;
  }).catch(function(what) {
    ok(false, "Catch has been called");
  }).then(function(what) {
    ok(true, "Then.resolve has been called");
    is(what, 44, "Value == 44");
    runTest();
  });
}

function promiseRejectThenCatchThen2() {
  var promise = new Promise(function(resolve, reject) {
    reject(42);
  });

  promise.then(function(what) {
    ok(true, "Then.resolve has been called");
    is(what, 42, "Value == 42");
    return what+1;
  }).catch(function(what) {
    is(what, 42, "Value == 42");
    ok(true, "Catch has been called");
    return what+1;
  }).then(function(what) {
    ok(true, "Then.resolve has been called");
    is(what, 43, "Value == 43");
    runTest();
  });
}

function promiseRejectThenCatchExceptionThen() {
  var promise = new Promise(function(resolve, reject) {
    reject(42);
  });

  promise.then(function(what) {
    ok(false, "Then.resolve has been called");
  }, function(what) {
    ok(true, "Then.reject has been called");
    is(what, 42, "Value == 42");
    throw(what + 1);
  }).catch(function(what) {
    ok(true, "Catch has been called");
    is(what, 43, "Value == 43");
    return what + 1;
  }).then(function(what) {
    ok(true, "Then.resolve has been called");
    is(what, 44, "Value == 44");
    runTest();
  });
}

function promiseThenCatchOrderingResolve() {
  var global = 0;
  var f = new Promise(function(r1, r2) {
    r1(42);
  });

  f.then(function() {
    f.then(function() {
      global++;
    });
    f.catch(function() {
      global++;
    });
    f.then(function() {
      global++;
    });
    setTimeout(function() {
      is(global, 2, "Many steps... should return 2");
      runTest();
    }, 0);
  });
}

function promiseThenCatchOrderingReject() {
  var global = 0;
  var f = new Promise(function(r1, r2) {
    r2(42);
  })

  f.then(function() {}, function() {
    f.then(function() {
      global++;
    });
    f.catch(function() {
      global++;
    });
    f.then(function() {}, function() {
      global++;
    });
    setTimeout(function() {
      is(global, 2, "Many steps... should return 2");
      runTest();
    }, 0);
  });
}

function promiseCatchNoArg() {
  var promise = new Promise(function(resolve, reject) {
    reject(42);
  });

  var clone = promise.catch();
  isnot(promise, clone, "These 2 promise objs are different");
  promise.catch(function(v) {
    clone.catch(function(cv) {
      is(v, cv, "Both reject to the same value");
      runTest();
    });
  });
}

function promiseNestedPromise() {
  new Promise(function(resolve, reject) {
    resolve(new Promise(function(resolve, reject) {
      ok(true, "Nested promise is executed");
      resolve(42);
    }));
  }).then(function(value) {
    is(value, 42, "Nested promise is executed and then == 42");
    runTest();
  });
}

function promiseNestedNestedPromise() {
  new Promise(function(resolve, reject) {
    resolve(new Promise(function(resolve, reject) {
      ok(true, "Nested promise is executed");
      resolve(42);
    }).then(function(what) { return what+1; }));
  }).then(function(value) {
    is(value, 43, "Nested promise is executed and then == 43");
    runTest();
  });
}

function promiseWrongNestedPromise() {
  new Promise(function(resolve, reject) {
    resolve(new Promise(function(r, r2) {
      ok(true, "Nested promise is executed");
      r(42);
    }));
    reject(42);
  }).then(function(value) {
    is(value, 42, "Nested promise is executed and then == 42");
    runTest();
  }, function(value) {
     ok(false, "This is wrong");
  });
}

function promiseLoop() {
  new Promise(function(resolve, reject) {
    resolve(new Promise(function(r1, r2) {
      ok(true, "Nested promise is executed");
      r1(new Promise(function(r1, r2) {
        ok(true, "Nested nested promise is executed");
        r1(42);
      }));
    }));
  }).then(function(value) {
    is(value, 42, "Nested nested promise is executed and then == 42");
    runTest();
  }, function(value) {
     ok(false, "This is wrong");
  });
}

function promiseStaticReject() {
  var promise = Promise.reject(42).then(function(what) {
    ok(false, "This should not be called");
  }, function(what) {
    is(what, 42, "Value == 42");
    runTest();
  });
}

function promiseStaticResolve() {
  var promise = Promise.resolve(42).then(function(what) {
    is(what, 42, "Value == 42");
    runTest();
  }, function() {
    ok(false, "This should not be called");
  });
}

function promiseResolveNestedPromise() {
  var promise = Promise.resolve(new Promise(function(r, r2) {
    ok(true, "Nested promise is executed");
    r(42);
  }, function() {
    ok(false, "This should not be called");
  })).then(function(what) {
    is(what, 42, "Value == 42");
    runTest();
  }, function() {
    ok(false, "This should not be called");
  });
}

var tests = [ promiseResolve, promiseReject,
              promiseException, promiseGC, promiseAsync,
              promiseDoubleThen, promiseThenException,
              promiseThenCatchThen, promiseRejectThenCatchThen,
              promiseRejectThenCatchThen2,
              promiseRejectThenCatchExceptionThen,
              promiseThenCatchOrderingResolve,
              promiseThenCatchOrderingReject,
              promiseNestedPromise, promiseNestedNestedPromise,
              promiseWrongNestedPromise, promiseLoop,
              promiseStaticReject, promiseStaticResolve,
              promiseResolveNestedPromise,
              promiseResolveNoArg,
              promiseRejectNoArg,
              promiseThenNoArg,
              promiseThenUndefinedResolveFunction,
              promiseThenNullResolveFunction,
              promiseCatchNoArg,
              promiseRejectNoHandler,
            ];

function runTest() {
  if (!tests.length) {
    SimpleTest.finish();
    return;
  }

  var test = tests.shift();
  test();
}

var p = SpecialPowers.getBoolPref("dom.promise.enabled");
SpecialPowers.setBoolPref("dom.promise.enabled", false);
ok(!("Promise" in window), "Promise object should not exist if disabled by pref");
SpecialPowers.setBoolPref("dom.promise.enabled", p);

SimpleTest.waitForExplicitFinish();
SpecialPowers.pushPrefEnv({"set": [["dom.promise.enabled", true]]}, runTest);
// -->
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</pre>
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