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test(function() {
var params = new URLSearchParams();
params.append('a', 'b c');
assert_equals(params + '', 'a=b+c');
params.delete('a');
params.append('a b', 'c');
assert_equals(params + '', 'a+b=c');
}, 'Serialize space');
test(function() {
var params = new URLSearchParams();
params.append('a', '');
assert_equals(params + '', 'a=');
params.append('a', '');
assert_equals(params + '', 'a=&a=');
params.append('', 'b');
assert_equals(params + '', 'a=&a=&=b');
params.append('', '');
assert_equals(params + '', 'a=&a=&=b&=');
params.append('', '');
assert_equals(params + '', 'a=&a=&=b&=&=');
}, 'Serialize empty value');
test(function() {
var params = new URLSearchParams();
params.append('', 'b');
assert_equals(params + '', '=b');
params.append('', 'b');
assert_equals(params + '', '=b&=b');
}, 'Serialize empty name');
test(function() {
var params = new URLSearchParams();
params.append('', '');
assert_equals(params + '', '=');
params.append('', '');
assert_equals(params + '', '=&=');
}, 'Serialize empty name and value');
test(function() {
var params = new URLSearchParams();
params.append('a', 'b+c');
assert_equals(params + '', 'a=b%2Bc');
params.delete('a');
params.append('a+b', 'c');
assert_equals(params + '', 'a%2Bb=c');
}, 'Serialize +');
test(function() {
var params = new URLSearchParams();
params.append('=', 'a');
assert_equals(params + '', '%3D=a');
params.append('b', '=');
assert_equals(params + '', '%3D=a&b=%3D');
}, 'Serialize =');
test(function() {
var params = new URLSearchParams();
params.append('&', 'a');
assert_equals(params + '', '%26=a');
params.append('b', '&');
assert_equals(params + '', '%26=a&b=%26');
}, 'Serialize &');
test(function() {
var params = new URLSearchParams();
params.append('a', '*-._');
assert_equals(params + '', 'a=*-._');
params.delete('a');
params.append('*-._', 'c');
assert_equals(params + '', '*-._=c');
}, 'Serialize *-._');
test(function() {
var params = new URLSearchParams();
params.append('a', 'b%c');
assert_equals(params + '', 'a=b%25c');
params.delete('a');
params.append('a%b', 'c');
assert_equals(params + '', 'a%25b=c');
params = new URLSearchParams('id=0&value=%')
assert_equals(params + '', 'id=0&value=%25')
}, 'Serialize %');
test(function() {
var params = new URLSearchParams();
params.append('a', 'b\0c');
assert_equals(params + '', 'a=b%00c');
params.delete('a');
params.append('a\0b', 'c');
assert_equals(params + '', 'a%00b=c');
}, 'Serialize \\0');
test(function() {
var params = new URLSearchParams();
params.append('a', 'b\uD83D\uDCA9c');
assert_equals(params + '', 'a=b%F0%9F%92%A9c');
params.delete('a');
params.append('a\uD83D\uDCA9b', 'c');
assert_equals(params + '', 'a%F0%9F%92%A9b=c');
}, 'Serialize \uD83D\uDCA9'); // Unicode Character 'PILE OF POO' (U+1F4A9)
test(function() {
var params;
params = new URLSearchParams('a=b&c=d&&e&&');
assert_equals(params.toString(), 'a=b&c=d&e=');
params = new URLSearchParams('a = b &a=b&c=d%20');
assert_equals(params.toString(), 'a+=+b+&a=b&c=d+');
// The lone '=' _does_ survive the roundtrip.
params = new URLSearchParams('a=&a=b');
assert_equals(params.toString(), 'a=&a=b');
params = new URLSearchParams('b=%2sf%2a');
assert_equals(params.toString(), 'b=%252sf*');
params = new URLSearchParams('b=%2%2af%2a');
assert_equals(params.toString(), 'b=%252*f*');
params = new URLSearchParams('b=%%2a');
assert_equals(params.toString(), 'b=%25*');
}, 'URLSearchParams.toString');
test(() => {
const url = new URL('http://www.example.com/?a=b,c');
const params = url.searchParams;
assert_equals(url.toString(), 'http://www.example.com/?a=b,c');
assert_equals(params.toString(), 'a=b%2Cc');
params.append('x', 'y');
assert_equals(url.toString(), 'http://www.example.com/?a=b%2Cc&x=y');
assert_equals(params.toString(), 'a=b%2Cc&x=y');
}, 'URLSearchParams connected to URL');
test(() => {
const url = new URL('http://www.example.com/');
const params = url.searchParams;
params.append('a\nb', 'c\rd');
params.append('e\n\rf', 'g\r\nh');
assert_equals(params.toString(), "a%0Ab=c%0Dd&e%0A%0Df=g%0D%0Ah");
}, 'URLSearchParams must not do newline normalization');
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