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my $data = read_file($filename);
# or maybe the reader needs to know the file format too?
my $data = read_file($filename, $fileformat);

use 5.010;
use Test tests => 2;
...
    'can get column headings from $data';
is $data->temperature( time => "0.01"), 273.018,
    'can retrieve temperature by time';

read_process_write(
    inputfiles => [ 't/data/TestInput1', 't/data/TestInput2'],
    merger     => sub { ... },
    outputfile => 't/data/temp/TestResult',
);