use 5.010;
use Test tests => 2;

use YourModule qw/read_file/;

my $data = read_file('t/data/ExampleData');

# now you have to ask yourself, what kind of data 
# will you need for processing the spreadsheets?

# I know nothing about your application, so
# I'm just making up some stuff here:
is join(',', $data->headings), 'time,pressure,temperature', 
    'can get column headings from $data';
is $data->temperature( time => "0.01"), 273.018,
    'can retrieve temperature by time';