Test failures with Ruby2.7

Hi there,

There are some test failures:
```
Finished in 0.024393s, 901.8873 runs/s, 860.8924 assertions/s.

  1) Error:
CompatibilityTest#test_decrypt_with_iv:
ArgumentError: key must be 32 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:72:in `key='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:72:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:49:in `decrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/compatibility_test.rb:47:in `test_decrypt_with_iv'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

  2) Error:
CompatibilityTest#test_encrypt_with_iv_and_salt:
ArgumentError: iv must be 16 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `iv='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:36:in `encrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/compatibility_test.rb:72:in `test_encrypt_with_iv_and_salt'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

  3) Error:
CompatibilityTest#test_ciphertext_encrypted_with_v2_decrypts_with_v2_gcm_iv_option:
ArgumentError: iv must be 12 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:66:in `iv='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:66:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:49:in `decrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/compatibility_test.rb:98:in `test_ciphertext_encrypted_with_v2_decrypts_with_v2_gcm_iv_option'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

  4) Error:
CompatibilityTest#test_decrypt_with_iv_and_salt:
ArgumentError: iv must be 16 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `iv='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:49:in `decrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/compatibility_test.rb:86:in `test_decrypt_with_iv_and_salt'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

  5) Error:
CompatibilityTest#test_encrypt_with_iv:
ArgumentError: key must be 32 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:72:in `key='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:72:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:36:in `encrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/compatibility_test.rb:23:in `test_encrypt_with_iv'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

  6) Failure:
CompatibilityTest#test_ciphertext_encrypted_with_v2_does_not_decrypt_without_v2_gcm_iv_option [/tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/compatibility_test.rb:103]:
[OpenSSL::Cipher::CipherError] exception expected, not
Class: <ArgumentError>
Message: <"iv must be 12 bytes">
---Backtrace---
/usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `iv='
/usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `crypt'
/usr/lib/ruby/vendor_ruby/encryptor.rb:49:in `decrypt'
/tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/compatibility_test.rb:105:in `block in test_ciphertext_encrypted_with_v2_does_not_decrypt_without_v2_gcm_iv_option'
/usr/lib/ruby/vendor_ruby/minitest/assertions.rb:398:in `assert_raises'
/tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/compatibility_test.rb:103:in `test_ciphertext_encrypted_with_v2_does_not_decrypt_without_v2_gcm_iv_option'
/usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
/usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
/usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
/usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
/usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
/usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
/usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
/usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
/usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
/usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
/usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
/usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
/usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
/usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
/usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
/usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
/usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
/usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
/usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
/usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
/usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'
---------------

  7) Error:
EncryptorTest#test_should_use_iv_to_initialize_encryption:
ArgumentError: iv must be 12 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `iv='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:36:in `encrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/encryptor_test.rb:85:in `block (2 levels) in <class:EncryptorTest>'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

  8) Error:
EncryptorTest#test_should_yield_block_with_cipher_and_options:
ArgumentError: iv must be 12 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `iv='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:36:in `encrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/encryptor_test.rb:78:in `block in <class:EncryptorTest>'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

  9) Error:
EncryptorTest#test_should_use_authentication_data_if_it_is_specified:
ArgumentError: iv must be 12 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `iv='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:36:in `encrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/encryptor_test.rb:101:in `block (2 levels) in <class:EncryptorTest>'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

 10) Error:
EncryptorTest#test_should_use_the_default_algorithm_if_one_is_not_specified:
ArgumentError: iv must be 12 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `iv='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:36:in `encrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/encryptor_test.rb:48:in `block in <class:EncryptorTest>'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

 11) Error:
EncryptorTest#test_should_use_the_default_authentication_data_if_it_is_not_specified:
ArgumentError: iv must be 12 bytes
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `iv='
    /usr/lib/ruby/vendor_ruby/encryptor.rb:79:in `crypt'
    /usr/lib/ruby/vendor_ruby/encryptor.rb:36:in `encrypt'
    /tmp/autopkgtest-lxc.u2pr2pbo/downtmp/build.9EI/src/test/encryptor_test.rb:93:in `block (2 levels) in <class:EncryptorTest>'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:98:in `block (3 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:195:in `capture_exceptions'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:95:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:270:in `time_it'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:94:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:211:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest/test.rb:93:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:1029:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:339:in `run_one_method'
    /usr/lib/ruby/vendor_ruby/minitest.rb:326:in `block (2 levels) in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `each'
    /usr/lib/ruby/vendor_ruby/minitest.rb:325:in `block in run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:365:in `on_signal'
    /usr/lib/ruby/vendor_ruby/minitest.rb:352:in `with_info_handler'
    /usr/lib/ruby/vendor_ruby/minitest.rb:324:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `block in __run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `map'
    /usr/lib/ruby/vendor_ruby/minitest.rb:164:in `__run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:141:in `run'
    /usr/lib/ruby/vendor_ruby/minitest.rb:68:in `block in autorun'

22 runs, 21 assertions, 1 failures, 10 errors, 0 skips
rake aborted!
Command failed with status (1): [ruby -w -I"test"  "/usr/lib/ruby/vendor_ruby/rake/rake_test_loader.rb" "test/compatibility_test.rb" "test/encryptor_string_test.rb" "test/encryptor_test.rb" "test/legacy_encryptor_string_test.rb" "test/legacy_encryptor_test.rb" -v]
```

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Test failures with Ruby2.7 #35

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Test failures with Ruby2.7 #35

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