Metaweb can use Freebase credentials to test read/write queries.
Set the environment variables FREEBASE_USER & FREEBASE_PASS to use these tests.

Checking if your kit is complete...
Looks good
Writing Makefile for WWW::Metaweb
cp lib/WWW/Metaweb.pm blib/lib/WWW/Metaweb.pm
cp lib/WWW/Metaweb/JSONLikePerl.pm blib/lib/WWW/Metaweb/JSONLikePerl.pm
Manifying blib/man3/WWW::Metaweb::JSONLikePerl.3
Manifying blib/man3/WWW::Metaweb.3
PERL_DL_NONLAZY=1 /Users/cpanrun/build/5.8.8/bin/perl "-MExtUtils::Command::MM" "-e" "test_harness(1, 'blib/lib', 'blib/arch')" t/*.t
t/01base.............1..2
ok 1 - module loaded okay
ok 2 - version is non-zero
ok
t/02emptysubclass....1..1
ok 1 - Empty package can subclass WWW::Metaweb
ok
t/11readquery........1..7
ok 1 - Can connect to Freebase. 
ok 2 - Can add query. 
ok 3 - Can send envelope. 
ok 4 - Result is okay. 
ok 5 - Result can be fetched as JSON. 
ok 6 - Result can be fetched as a Perl structure. 
ok 7 - Structure of test query is correct.
ok
t/12jsoncallback.....1..4
ok 1 - First callback called.
ok 2 - JSON sent to callback correctly.
ok 3 - Second callback called.
ok 4 - Callback altered JSON.
ok
t/21writequery.......1..8
ok 1 # skip No Freebase credentials provided
ok 2 # skip No Freebase credentials provided
ok 3 # skip No Freebase credentials provided
ok 4 # skip No Freebase credentials provided
ok 5 # skip No Freebase credentials provided
ok 6 # skip No Freebase credentials provided
ok 7 # skip No Freebase credentials provided
ok 8 # skip No Freebase credentials provided
ok
        8/8 skipped: various reasons
All tests successful, 8 subtests skipped.
Files=5, Tests=22,  2 wallclock secs ( 0.67 cusr +  0.20 csys =  0.87 CPU)
Installing /Users/cpanrun/build/5.8.8/html/site/lib/WWW/Metaweb.html
Installing /Users/cpanrun/build/5.8.8/html/site/lib/WWW/Metaweb/JSONLikePerl.html
Installing /Users/cpanrun/build/5.8.8/lib/site_perl/5.8.8/WWW/Metaweb.pm
Installing /Users/cpanrun/build/5.8.8/lib/site_perl/5.8.8/WWW/Metaweb/JSONLikePerl.pm
Installing /Users/cpanrun/build/5.8.8/man/man3/WWW::Metaweb.3
Installing /Users/cpanrun/build/5.8.8/man/man3/WWW::Metaweb::JSONLikePerl.3
Appending installation info to /Users/cpanrun/build/5.8.8/lib/5.8.8/darwin-thread-multi-2level/perllocal.pod