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-rw-r--r--testing/web-platform/tests/common/stringifiers.js57
1 files changed, 57 insertions, 0 deletions
diff --git a/testing/web-platform/tests/common/stringifiers.js b/testing/web-platform/tests/common/stringifiers.js
new file mode 100644
index 0000000000..8dadac1d49
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+++ b/testing/web-platform/tests/common/stringifiers.js
@@ -0,0 +1,57 @@
+/**
+ * Runs tests for <https://webidl.spec.whatwg.org/#es-stringifier>.
+ * @param {Object} aObject - object to test
+ * @param {string} aAttribute - IDL attribute name that is annotated with `stringifier`
+ * @param {boolean} aIsUnforgeable - whether the IDL attribute is `[LegacyUnforgeable]`
+ */
+function test_stringifier_attribute(aObject, aAttribute, aIsUnforgeable) {
+ // Step 1.
+ test(function() {
+ [null, undefined].forEach(function(v) {
+ assert_throws_js(TypeError, function() {
+ aObject.toString.call(v);
+ });
+ });
+ });
+
+ // TODO Step 2: security check.
+
+ // Step 3.
+ test(function() {
+ assert_false("Window" in window && aObject instanceof window.Window);
+ [{}, window].forEach(function(v) {
+ assert_throws_js(TypeError, function() {
+ aObject.toString.call(v)
+ });
+ });
+ });
+
+ // Step 4-6.
+ var expected_value;
+ test(function() {
+ expected_value = aObject[aAttribute];
+ assert_equals(aObject[aAttribute], expected_value,
+ "The attribute " + aAttribute + " should be pure.");
+ });
+
+ var test_error = { name: "test" };
+ test(function() {
+ if (!aIsUnforgeable) {
+ Object.defineProperty(aObject, aAttribute, {
+ configurable: true,
+ get: function() { throw test_error; }
+ });
+ }
+ assert_equals(aObject.toString(), expected_value);
+ });
+
+ test(function() {
+ if (!aIsUnforgeable) {
+ Object.defineProperty(aObject, aAttribute, {
+ configurable: true,
+ value: { toString: function() { throw test_error; } }
+ });
+ }
+ assert_equals(aObject.toString(), expected_value);
+ });
+}