$ rm .prove

$ cat t/test.t
use Test::More tests => 4;
ok 1 == 1, 'A';
ok 1 == 2, 'B';
ok 1 == 1, 'C';
ok 1 == 2, 'D';

$ prove -v --state=save t/test.t
t/test.t ..
1..4
ok 1 - A
not ok 2 - B

#   Failed test 'B'
#   at t/test.t line 3.
ok 3 - C
not ok 4 - D

#   Failed test 'D'
#   at t/test.t line 5.
# Looks like you failed 2 tests of 4.
Dubious, test returned 2 (wstat 512, 0x200)
Failed 2/4 subtests

Test Summary Report
-------------------
t/test.t (Wstat: 512 Tests: 4 Failed: 2)
  Failed tests:  2, 4
  Non-zero exit status: 2
Files=1, Tests=4,  0 wallclock secs ( 0.02 usr  0.01 sys +  0.03 cusr  0.00 csys =  0.06 CPU)
Result: FAIL

$ cat .prove
---
generation: 1
last_run_time: 1519583552.87203
tests:
  t/test.t:
    elapsed: 0.0406849384307861
    gen: 1
    last_fail_time: 1519583552.87122
    last_result: 3
    last_run_time: 1519583552.87122
    last_todo: 0
    seq: 1
    total_failures: 1
version: 1
...

$ prove -v --state=failed,save t/test.t
t/test.t ..
t/test.t ..
1..4
ok 1 - A
not ok 2 - B

#   Failed test 'B'
#   at t/test.t line 3.
ok 3 - C
not ok 4 - D

#   Failed test 'D'
#   at t/test.t line 5.
# Looks like you failed 2 tests of 4.
Dubious, test returned 2 (wstat 512, 0x200)
Failed 2/4 subtests

Test Summary Report
-------------------
t/test.t (Wstat: 512 Tests: 4 Failed: 2)
  Failed tests:  2, 4
  Non-zero exit status: 2
Files=1, Tests=4,  0 wallclock secs ( 0.02 usr  0.01 sys +  0.02 cusr  0.00 csys =  0.05 CPU)
Result: FAIL

$ cat .prove
---
generation: 2
last_run_time: 1519583756.96688
tests:
  t/test1.t:
    elapsed: 0.0349948406219482
    gen: 2
    last_fail_time: 1519583756.96619
    last_result: 3
    last_run_time: 1519583756.96619
    last_todo: 0
    mtime: 1519583524
    seq: 2
    total_failures: 2
version: 1
...