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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()');