perl-Test-Unit-0.25-17.fc21 fails to build randomly due to test in F21:

[...]
not ok ERROR test_assert_deep_equals
t/tlib/AssertTest.pm:500 - test_assert_deep_equals(Class::Inner::__A20)
Expected Test::Unit::Failure `(?^mx:^Structures\ begin\ differing\ at: $ \n
        \S*\s* \$a .* = .* (?-x:HASH)      .* $ \n
        \S*\s* \$b .* = .* (?-x:not exist))', got `Structures begin differing at:
  $a->{john}{spouse}{spouse}{name} = 'John Doe'
  $b->{john}{spouse}{spouse}{name} = 'Baby Doll'
'
ok PASS test_assert_str_equals
ok PASS test_fail_assert_not_null
ok PASS test_succeed_assert_null
ok PASS test_assert_raises
ok PASS test_assert_equals
ok PASS test_ok_not_equals
ok PASS test_numericness
ok PASS test_success_assert_not_equals
ok PASS test_multi_assert
ok PASS test_ok_boolean
ok PASS test_fail_assert_not_equals
ok PASS test_assert_equals_null
ok PASS test_fail_assert_null
ok PASS test_assert
ok PASS test_ok_equals
ok PASS test_assert_matches
ok PASS test_succeed_assert_not_null
ok PASS test_ok_bad_args
ok PASS test_fail
Failed 1/40 subtests 

Test Summary Report
-------------------
t/assert.t (Wstat: 0 Tests: 40 Failed: 1)
  Failed test:  21