Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/testharness-helpers.js

+/*
+ * testharness-helpers contains various useful extensions to testharness.js to
+ * allow them to be used across multiple tests before they have been
+ * upstreamed. This file is intended to be usable from both document and worker
+ * environments, so code should for example not rely on the DOM.
+ */
+
+// Returns a promise that fulfills after the provided |promise| is fulfilled.
+// The |test| succeeds only if |promise| rejects with an exception matching
+// |code|. Accepted values for |code| follow those accepted for assert_throws().
+// The optional |description| describes the test being performed.
+//
+// E.g.:
+//   assert_promise_rejects(
+//       new Promise(...), // something that should throw an exception.
+//       'NotFoundError',
+//       'Should throw NotFoundError.');
+//
+//   assert_promise_rejects(
+//       new Promise(...),
+//       new TypeError(),
+//       'Should throw TypeError');
+function assert_promise_rejects(promise, code, description) {
+  return promise.then(
+    function() {
+      throw 'assert_promise_rejects: ' + description + ' Promise did not reject.';
+    },
+    function(e) {
+      if (code !== undefined) {
+        assert_throws(code, function() { throw e; }, description);
+      }
+    });
+}
+
+// Asserts that two objects |actual| and |expected| are weakly equal under the
+// following definition:
+//
+// |a| and |b| are weakly equal if any of the following are true:
+//   1. If |a| is not an 'object', and |a| === |b|.
+//   2. If |a| is an 'object', and all of the following are true:
+//     2.1 |a.p| is weakly equal to |b.p| for all own properties |p| of |a|.
+//     2.2 Every own property of |b| is an own property of |a|.
+//
+// This is a replacement for the the version of assert_object_equals() in
+// testharness.js. The latter doesn't handle own properties correctly. I.e. if
+// |a.p| is not an own property, it still requires that |b.p| be an own
+// property.
+//
+// Note that |actual| must not contain cyclic references.
+self.assert_object_equals = function(actual, expected, description) {
+  var object_stack = [];
+
+  function _is_equal(actual, expected, prefix) {
+    if (typeof actual !== 'object') {
+      assert_equals(actual, expected, prefix);
+      return;
+    }
+    assert_true(typeof expected === 'object', prefix);
+    assert_equals(object_stack.indexOf(actual), -1,
+                  prefix + ' must not contain cyclic references.');
+
+    object_stack.push(actual);
+
+    Object.getOwnPropertyNames(expected).forEach(function(property) {
+        assert_own_property(actual, property, prefix);
+        _is_equal(actual[property], expected[property],
+                  prefix + '.' + property);
+      });
+    Object.getOwnPropertyNames(actual).forEach(function(property) {
+        assert_own_property(expected, property, prefix);
+      });
+
+    object_stack.pop();
+  }
+
+  function _brand(object) {
+    return Object.prototype.toString.call(object).match(/^\[object (.*)\]$/)[1];
+  }
+
+  _is_equal(actual, expected,
+            (description ? description + ': ' : '') + _brand(expected));
+};
+
+// Equivalent to assert_in_array, but uses a weaker equivalence relation
+// (assert_object_equals) than '==='.
+function assert_object_in_array(actual, expected_array, description) {
+  assert_true(expected_array.some(function(element) {
+      try {
+        assert_object_equals(actual, element);
+        return true;
+      } catch (e) {
+        return false;
+      }
+    }), description);
+}
+
+// Assert that the two arrays |actual| and |expected| contain the same set of
+// elements as determined by assert_object_equals. The order is not significant.
+//
+// |expected| is assumed to not contain any duplicates as determined by
+// assert_object_equals().
+function assert_array_equivalent(actual, expected, description) {
+  assert_true(Array.isArray(actual), description);
+  assert_equals(actual.length, expected.length, description);
+  expected.forEach(function(expected_element) {
+      // assert_in_array treats the first argument as being 'actual', and the
+      // second as being 'expected array'. We are switching them around because
+      // we want to be resilient against the |actual| array containing
+      // duplicates.
+      assert_object_in_array(expected_element, actual, description);
+    });
+}
+
+// Asserts that two arrays |actual| and |expected| contain the same set of
+// elements as determined by assert_object_equals(). The corresponding elements
+// must occupy corresponding indices in their respective arrays.
+function assert_array_objects_equals(actual, expected, description) {
+  assert_true(Array.isArray(actual), description);
+  assert_equals(actual.length, expected.length, description);
+  actual.forEach(function(value, index) {
+      assert_object_equals(value, expected[index],
+                           description + ' : object[' + index + ']');
+    });
+}
+
+// Asserts that |object| that is an instance of some interface has the attribute
+// |attribute_name| following the conditions specified by WebIDL, but it's
+// acceptable that the attribute |attribute_name| is an own property of the
+// object because we're in the middle of moving the attribute to a prototype
+// chain.  Once we complete the transition to prototype chains,
+// assert_will_be_idl_attribute must be replaced with assert_idl_attribute
+// defined in testharness.js.
+//
+// FIXME: Remove assert_will_be_idl_attribute once we complete the transition
+// of moving the DOM attributes to prototype chains.  (http://crbug.com/43394)
+function assert_will_be_idl_attribute(object, attribute_name, description) {
+  assert_true(typeof object === "object", description);
+
+  assert_true("hasOwnProperty" in object, description);
+
+  // Do not test if |attribute_name| is not an own property because
+  // |attribute_name| is in the middle of the transition to a prototype
+  // chain.  (http://crbug.com/43394)
+
+  assert_true(attribute_name in object, description);
+}
+
+// Stringifies a DOM object.  This function stringifies not only own properties
+// but also DOM attributes which are on a prototype chain.  Note that
+// JSON.stringify only stringifies own properties.
+function stringifyDOMObject(object)
+{
+    function deepCopy(src) {
+        if (typeof src != "object")
+            return src;
+        var dst = Array.isArray(src) ? [] : {};
+        for (var property in src) {
+            dst[property] = deepCopy(src[property]);
+        }
+        return dst;
+    }
+    return JSON.stringify(deepCopy(object));
+}