1 files changed, 51 insertions, 0 deletions
diff --git a/testing/web-platform/tests/url/urlsearchparams-append.html b/testing/web-platform/tests/url/urlsearchparams-append.html
new file mode 100644
index 000000000..78a8986e1
--- /dev/null
+++ b/testing/web-platform/tests/url/urlsearchparams-append.html
@@ -0,0 +1,51 @@
+<!doctype html>
+<html>
+<head>
+<meta charset="utf8">
+<link rel="help" href="http://url.spec.whatwg.org/#dom-urlsearchparams-append">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="resources/testharness-extras.js"></script>
+<script>
+test(function() {
+    var params = new URLSearchParams();
+    params.append('a', 'b');
+    assert_equals(params + '', 'a=b');
+    params.append('a', 'b');
+    assert_equals(params + '', 'a=b&a=b');
+    params.append('a', 'c');
+    assert_equals(params + '', 'a=b&a=b&a=c');
+}, 'Append same name');
+
+test(function() {
+    var params = new URLSearchParams();
+    params.append('', '');
+    assert_equals(params + '', '=');
+    params.append('', '');
+    assert_equals(params + '', '=&=');
+}, 'Append empty strings');
+
+test(function() {
+    var params = new URLSearchParams();
+    params.append(null, null);
+    assert_equals(params + '', 'null=null');
+    params.append(null, null);
+    assert_equals(params + '', 'null=null&null=null');
+}, 'Append null');
+
+test(function() {
+    var params = new URLSearchParams();
+    params.append('first', 1);
+    params.append('second', 2);
+    params.append('third', '');
+    params.append('first', 10);
+    assert_true(params.has('first'), 'Search params object has name "first"');
+    assert_equals(params.get('first'), '1', 'Search params object has name "first" with value "1"');
+    assert_equals(params.get('second'), '2', 'Search params object has name "second" with value "2"');
+    assert_equals(params.get('third'), '', 'Search params object has name "third" with value ""');
+    params.append('first', 10);
+    assert_equals(params.get('first'), '1', 'Search params object has name "first" with value "1"');
+}, 'Append multiple');
+</script>
+</head>
+</html>