1 files changed, 74 insertions, 0 deletions
diff --git a/testing/web-platform/tests/streams/resources/test-utils.js b/testing/web-platform/tests/streams/resources/test-utils.js
new file mode 100644
index 0000000000..5ff8fc8cec
--- /dev/null
+++ b/testing/web-platform/tests/streams/resources/test-utils.js
@@ -0,0 +1,74 @@
+'use strict';
+
+self.getterRejects = (t, obj, getterName, target) => {
+  const getter = Object.getOwnPropertyDescriptor(obj, getterName).get;
+
+  return promise_rejects_js(t, TypeError, getter.call(target), getterName + ' should reject with a TypeError');
+};
+
+self.getterRejectsForAll = (t, obj, getterName, targets) => {
+  return Promise.all(targets.map(target => self.getterRejects(t, obj, getterName, target)));
+};
+
+self.methodRejects = (t, obj, methodName, target, args) => {
+  const method = obj[methodName];
+
+  return promise_rejects_js(t, TypeError, method.apply(target, args),
+                         methodName + ' should reject with a TypeError');
+};
+
+self.methodRejectsForAll = (t, obj, methodName, targets, args) => {
+  return Promise.all(targets.map(target => self.methodRejects(t, obj, methodName, target, args)));
+};
+
+self.getterThrows = (obj, getterName, target) => {
+  const getter = Object.getOwnPropertyDescriptor(obj, getterName).get;
+
+  assert_throws_js(TypeError, () => getter.call(target), getterName + ' should throw a TypeError');
+};
+
+self.getterThrowsForAll = (obj, getterName, targets) => {
+  targets.forEach(target => self.getterThrows(obj, getterName, target));
+};
+
+self.methodThrows = (obj, methodName, target, args) => {
+  const method = obj[methodName];
+  assert_equals(typeof method, 'function', methodName + ' should exist');
+
+  assert_throws_js(TypeError, () => method.apply(target, args), methodName + ' should throw a TypeError');
+};
+
+self.methodThrowsForAll = (obj, methodName, targets, args) => {
+  targets.forEach(target => self.methodThrows(obj, methodName, target, args));
+};
+
+self.constructorThrowsForAll = (constructor, firstArgs) => {
+  firstArgs.forEach(firstArg => assert_throws_js(TypeError, () => new constructor(firstArg),
+                                                 'constructor should throw a TypeError'));
+};
+
+self.delay = ms => new Promise(resolve => step_timeout(resolve, ms));
+
+// For tests which verify that the implementation doesn't do something it shouldn't, it's better not to use a
+// timeout. Instead, assume that any reasonable implementation is going to finish work after 2 times around the event
+// loop, and use flushAsyncEvents().then(() => assert_array_equals(...));
+// Some tests include promise resolutions which may mean the test code takes a couple of event loop visits itself. So go
+// around an extra 2 times to avoid complicating those tests.
+self.flushAsyncEvents = () => delay(0).then(() => delay(0)).then(() => delay(0)).then(() => delay(0));
+
+self.assert_typed_array_equals = (actual, expected, message) => {
+  const prefix = message === undefined ? '' : `${message} `;
+  assert_equals(typeof actual, 'object', `${prefix}type is object`);
+  assert_equals(actual.constructor, expected.constructor, `${prefix}constructor`);
+  assert_equals(actual.byteOffset, expected.byteOffset, `${prefix}byteOffset`);
+  assert_equals(actual.byteLength, expected.byteLength, `${prefix}byteLength`);
+  assert_equals(actual.buffer.byteLength, expected.buffer.byteLength, `${prefix}buffer.byteLength`);
+  assert_array_equals([...actual], [...expected], `${prefix}contents`);
+  assert_array_equals([...new Uint8Array(actual.buffer)], [...new Uint8Array(expected.buffer)], `${prefix}buffer contents`);
+};
+
+self.makePromiseAndResolveFunc = () => {
+  let resolve;
+  const promise = new Promise(r => { resolve = r; });
+  return [promise, resolve];
+};