The Parse Array operator uses a comma-separated string to specify an array. To specify an empty array, use the 'blank' keyword.

when input is⇓ story test fixture check plain test 'sample domain' set strings a,b,c check strings a,b,c check 'strings at' 2 c name symbol1 string: x name symbol2 string: y set strings <<symbol1,<<symbol2 check strings x,y set strings blank check 'strings at' 0 exception[IndexOutOfRangeException] sample domain set strings a,b,c check strings a,b,c check strings at 2 c name symbol1 string: x name symbol2 string: y set strings <<symbol1,<<symbol2 check strings x,y set strings blank check strings at 0 exception[IndexOutOfRangeException]

'sample domain' set strings a,b,c check strings a,b,c check 'strings at' 2 c name symbol1 string: x name symbol2 string: y set strings <<symbol1,<<symbol2 check strings x,y set strings blank check 'strings at' 0 exception[IndexOutOfRangeException]

then output is

sample domain set strings a,b,c check strings a,b,c check strings at 2 c name symbol1 string: x name symbol2 string: y set strings <<symbol1,<<symbol2 check strings x,y set strings blank check strings at 0 exception[IndexOutOfRangeException]