test(function() {
var params = new URLSearchParams('a=b&c=d');
params.set('a', 'B');
assert_equals(params + '', 'a=B&c=d');
params = new URLSearchParams('a=b&c=d&a=e');
params.set('a', 'B');
assert_equals(params + '', 'a=B&c=d')
params.set('e', 'f');
assert_equals(params + '', 'a=B&c=d&e=f')
}, 'Set basics');
test(function() {
var params = new URLSearchParams('a=1&a=2&a=3');
assert_true(params.has('a'), 'Search params object has name "a"');
assert_equals(params.get('a'), '1', 'Search params object has name "a" with value "1"');
params.set('first', 4);
assert_true(params.has('a'), 'Search params object has name "a"');
assert_equals(params.get('a'), '1', 'Search params object has name "a" with value "1"');
params.set('a', 4);
assert_true(params.has('a'), 'Search params object has name "a"');
assert_equals(params.get('a'), '4', 'Search params object has name "a" with value "4"');
}, 'URLSearchParams.set');
test(function() {
const testValue = '+15555555555';
const params = new URLSearchParams();
params.set('query', testValue);
var newParams = new URLSearchParams(params.toString());
assert_equals(params.toString(), 'query=%2B15555555555');
assert_equals(params.get('query'), testValue);
assert_equals(newParams.get('query'), testValue);
}, 'Parse encoded +');
test(function() {
var params = new URLSearchParams('a=1&a=2&a=3&a');
assert_true(params.has('a'), 'Search params object has name "a"');
var matches = params.getAll('a');
assert_true(matches && matches.length == 4, 'Search params object has values for name "a"');
assert_array_equals(matches, ['1', '2', '3', ''], 'Search params object has expected name "a" values');
params.set('a', 'one');
assert_equals(params.get('a'), 'one', 'Search params object has name "a" with value "one"');
var matches = params.getAll('a');
assert_true(matches && matches.length == 1, 'Search params object has values for name "a"');
assert_array_equals(matches, ['one'], 'Search params object has expected name "a" values');
}, 'getAll() multiples');