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test(function() {
var params = new URLSearchParams('a=b&c=d');
assert_true(params.has('a'));
assert_true(params.has('c'));
assert_false(params.has('e'));
params = new URLSearchParams('a=b&c=d&a=e');
assert_true(params.has('a'));
params = new URLSearchParams('=b&c=d');
assert_true(params.has(''));
params = new URLSearchParams('null=a');
assert_true(params.has(null));
}, 'Has basics');
test(function() {
var params = new URLSearchParams('a=b&c=d&&');
params.append('first', 1);
params.append('first', 2);
assert_true(params.has('a'), 'Search params object has name "a"');
assert_true(params.has('c'), 'Search params object has name "c"');
assert_true(params.has('first'), 'Search params object has name "first"');
assert_false(params.has('d'), 'Search params object has no name "d"');
params.delete('first');
assert_false(params.has('first'), 'Search params object has no name "first"');
}, 'has() following delete()');
test(() => {
const params = new URLSearchParams("a=b&a=d&c&e&");
assert_true(params.has('a', 'b'));
assert_false(params.has('a', 'c'));
assert_true(params.has('a', 'd'));
assert_true(params.has('e', ''));
params.append('first', null);
assert_false(params.has('first', ''));
assert_true(params.has('first', 'null'));
params.delete('a', 'b');
assert_true(params.has('a', 'd'));
}, "Two-argument has()");
test(() => {
const params = new URLSearchParams("a=b&a=d&c&e&");
assert_true(params.has('a', 'b'));
assert_false(params.has('a', 'c'));
assert_true(params.has('a', 'd'));
assert_true(params.has('a', undefined));
}, "Two-argument has() respects undefined as second arg");
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