$test1 is not defined.
Use of uninitialized value $test1 in concatenation (.) or string at ./pm_example.pl line 13.
test1 after hash assignment:		''
i = 0	test1 after defaulting to i:	'0'
$test1 is defined.
test1 after hash assignment:		'0'
i = 1	test1 after defaulting to i:	'0'