Add CreateResolvingFunctions tests

test/built-ins/Promise/create-resolving-functions-reject.js

@@ -0,0 +1,27 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-createresolvingfunctions
+description: >
+  reject is anonymous built-in function with length of 1.
+info: |
+  CreateResolvingFunctions ( promise )
+
+  ...
+  7. Let reject be ! CreateBuiltinFunction(stepsReject, « [[Promise]], [[AlreadyResolved]] »).
+features: [Reflect.construct]
+includes: [isConstructor.js]
+flags: [async]
+---*/
+
+Promise.resolve(1).then(function() {
+  return Promise.resolve(2);
+});
+
+Promise.prototype.then = function(_resolve, reject) {
+  assert.sameValue(!isConstructor(reject));
+  assert.sameValue(reject.length, 1);
+  assert.sameValue(reject.name, '');
+
+  $DONE();
+};

test/built-ins/Promise/create-resolving-functions-resolve.js

@@ -0,0 +1,27 @@
+// Copyright (C) 2019 Alexey Shvayka. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-createresolvingfunctions
+description: >
+  resolve is anonymous built-in function with length of 1.
+info: |
+  CreateResolvingFunctions ( promise )
+
+  ...
+  3. Let resolve be ! CreateBuiltinFunction(stepsResolve, « [[Promise]], [[AlreadyResolved]] »).
+features: [Reflect.construct]
+includes: [isConstructor.js]
+flags: [async]
+---*/
+
+Promise.resolve(1).then(function() {
+  return Promise.resolve(2);
+});
+
+Promise.prototype.then = function(resolve) {
+  assert.sameValue(!isConstructor(resolve));
+  assert.sameValue(resolve.length, 1);
+  assert.sameValue(resolve.name, '');
+
+  $DONE();
+};