2     var params = new URLSearchParams();
3     assert_equals(params + '', '');
4     params = new URLSearchParams('');
5     assert_equals(params + '', '');
6     params = new URLSearchParams('a=b');
7     assert_equals(params + '', 'a=b');
8     params = new URLSearchParams(params);
9     assert_equals(params + '', 'a=b');
13     var params = new URLSearchParams()
14     assert_equals(params.toString(), "")
18     var params = new URLSearchParams("?a=b")
19     assert_equals(params.toString(), "a=b")
23     var params = new URLSearchParams(DOMException);  variable
24 …assert_equals(params.toString(), "INDEX_SIZE_ERR=1&DOMSTRING_SIZE_ERR=2&HIERARCHY_REQUEST_ERR=3&WR…
30     var params = new URLSearchParams('');  variable
31     assert_true(params != null, 'constructor returned non-null value.');
32 …assert_equals(params.__proto__, URLSearchParams.prototype, 'expected URLSearchParams.prototype as …
36     var params = new URLSearchParams({});  variable
37     assert_equals(params + '', "");
41     var params = new URLSearchParams('a=b');
42     assert_true(params != null, 'constructor returned non-null value.');
43     assert_true(params.has('a'), 'Search params object has name "a"');
44     assert_false(params.has('b'), 'Search params object has not got name "b"');
46     params = new URLSearchParams('a=b&c');
47     assert_true(params != null, 'constructor returned non-null value.');
48     assert_true(params.has('a'), 'Search params object has name "a"');
49     assert_true(params.has('c'), 'Search params object has name "c"');
51     params = new URLSearchParams('&a&&& &&&&&a+b=& c&m%c3%b8%c3%b8');
52     assert_true(params != null, 'constructor returned non-null value.');
53     assert_true(params.has('a'), 'Search params object has name "a"');
54     assert_true(params.has('a b'), 'Search params object has name "a b"');
55     assert_true(params.has(' '), 'Search params object has name " "');
56     assert_false(params.has('c'), 'Search params object did not have the name "c"');
57     assert_true(params.has(' c'), 'Search params object has name " c"');
58     assert_true(params.has('møø'), 'Search params object has name "møø"');
63     var params = new URLSearchParams(seed);
64     assert_true(params != null, 'constructor returned non-null value.');
65     assert_equals(params.get('a'), 'b');
66     assert_equals(params.get('c'), 'd');
67     assert_false(params.has('d'));
71     assert_false(params.has('e'));
72     params.append('g', 'h');
77     var params = new URLSearchParams('a=b+c');
78     assert_equals(params.get('a'), 'b c');
79     params = new URLSearchParams('a+b=c');
80     assert_equals(params.get('a b'), 'c');
85     const params = new URLSearchParams();
86     params.set('query', testValue);
87     var newParams = new URLSearchParams(params.toString());
89     assert_equals(params.toString(), 'query=%2B15555555555');
90     assert_equals(params.get('query'), testValue);
95     var params = new URLSearchParams('a=b c');
96     assert_equals(params.get('a'), 'b c');
97     params = new URLSearchParams('a b=c');
98     assert_equals(params.get('a b'), 'c');
102     var params = new URLSearchParams('a=b%20c');
103     assert_equals(params.get('a'), 'b c');
104     params = new URLSearchParams('a%20b=c');
105     assert_equals(params.get('a b'), 'c');
109     var params = new URLSearchParams('a=b\0c');
110     assert_equals(params.get('a'), 'b\0c');
111     params = new URLSearchParams('a\0b=c');
112     assert_equals(params.get('a\0b'), 'c');
116     var params = new URLSearchParams('a=b%00c');
117     assert_equals(params.get('a'), 'b\0c');
118     params = new URLSearchParams('a%00b=c');
119     assert_equals(params.get('a\0b'), 'c');
123     var params = new URLSearchParams('a=b\u2384');
124     assert_equals(params.get('a'), 'b\u2384');
125     params = new URLSearchParams('a\u2384b=c');
126     assert_equals(params.get('a\u2384b'), 'c');
130     var params = new URLSearchParams('a=b%e2%8e%84');
131     assert_equals(params.get('a'), 'b\u2384');
132     params = new URLSearchParams('a%e2%8e%84b=c');
133     assert_equals(params.get('a\u2384b'), 'c');
137     var params = new URLSearchParams('a=b\uD83D\uDCA9c');
138     assert_equals(params.get('a'), 'b\uD83D\uDCA9c');
139     params = new URLSearchParams('a\uD83D\uDCA9b=c');
140     assert_equals(params.get('a\uD83D\uDCA9b'), 'c');
144     var params = new URLSearchParams('a=b%f0%9f%92%a9c');
145     assert_equals(params.get('a'), 'b\uD83D\uDCA9c');
146     params = new URLSearchParams('a%f0%9f%92%a9b=c');
147     assert_equals(params.get('a\uD83D\uDCA9b'), 'c');
151     var params = new URLSearchParams([]);
152     assert_true(params != null, 'constructor returned non-null value.');
153     params = new URLSearchParams([['a', 'b'], ['c', 'd']]);
154     assert_equals(params.get("a"), "b");
155     assert_equals(params.get("c"), "d");
167         let params = new URLSearchParams(val.input),
169         for (let param of params) {
177   var params = new URLSearchParams()  variable
178   params[Symbol.iterator] = function *() {  generator
181   let params2 = new URLSearchParams(params)