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sub trim { for (@_) { ... s/\s+$//; } }
subtest 'trim' => sub { is("leading", trim(" leading"), "trim: leading"); ... more test cases ... };
subtest 'trim' => sub { my @test = (" leading", "trailing ", " both "); ... is("'leading', 'trailing', 'both'", $out, "trim: list"); done_testing(); };