diff --git a/tests/testthat/_snaps/key_write.md b/tests/testthat/_snaps/key_write.md
new file mode 100644
index 0000000..c511cac
--- /dev/null
+++ b/tests/testthat/_snaps/key_write.md
@@ -0,0 +1,177 @@
+# Display sample key
+
+    Code
+      write_key(key, NULL)
+    Output
+      -----BEGIN PRIVATE KEY-----
+      MIIJpQIBADASBg4rBgEEAYOoeAWOQwEBAgUABIIJYAC3S+CnQiQksKYiYn9jshHE
+      kOk0P1com0rokhFaaVxFOaNRdOkSefRnPkxbbytZk20KrWmiWj51Q2bikOUKOsXR
+      fyPmZo76PfEjUe7DjwRIrLpAX2SFznx8a9wCUEBbTbW2MNl2JaPSSZwFTB6zRaCg
+      DWBLJZfcXo48FophFFybu5Ippp/EkXrxmjuVJXXEQOLHCLhmRAx7v1T6MCmLc3FK
+      ZPzck+hVP6P8Vhr4xtc3h0Acdm5sjxdVu8pHseDxLWUTDCJWFvG4jZ3ReDIZrk0J
+      HaZMBrujNyiRZMTKZafbeHeMJrchzqYwvaNylWrcWXfUZQxUufSCFNdaczdTlhYy
+      L9pUB/mJgekSMtUGiv62MVLXP1uqcY9EJ8DBlzmhl/vKq+ZRANsHkaL2bIdrMJwZ
+      J50cKhxUgZ2GYFd5FRbXL9fcjq7gRkwJzu9bG1CDhhM5XHWBVLQJd2wcSVDRBtzp
+      mxliNjJkkqrIoPSTMvNTq9jbWzjVlXAoS4dsdo7lhDBczmP6YO3MpRrIlDFxQUkj
+      hJLIoGq5WLeFNak1r1GFWoD2jGFie/aZGHipTifzbp3WanU1kstsb6xBt0PMNeej
+      Fs4mYrYihb3qNH1jO+cGCYPFwKUrVIMjqwv8JQawfFW2BnxggH0piFWAVo2Ikh9D
+      V0GqFPYbb2nbB9bBOzQ1iyvYO753ynFgwETzEQcMQdPbVCjIN15ixmS7eRQJHFvi
+      gzbKORAgIzvqsmzAziUDRYoHKqToxMrTLCunkRm1vWqAlKZ4I2OWTH8lMAYVp6I7
+      rL7qL2uAHxIpPIq1gQwYV4UgL1S0PnUFMwQ6ajmzVdhLUK4JXVUUZsAoyw/hNNHK
+      F4QUeE22g3vlXzoULLmEiVSDay44kgHZUywmdY9ZMRl3QGdXv6uCAaDrYzA7gwpJ
+      zFJ1odmzzoyJh1GJxMpjdCzWee87dlRFDRW7MPBQlR/jAxnYzmpMku0oS5SCyd+5
+      IFqwtoTDZvzHLcqarnHKQj8Wr8qjiiYzMW6jF/GHSQjTQJlEPJbyRK6KEsmhEMjx
+      TkWodsZBFNPDf79DC0SbOpeKBgtnhfhMYk52LNrCI34JfZV5SdrLxqLjAg5zek2R
+      YZqsbROZK1IGhfiEeom6qhcqP4VxhkbpJy66p610vP3cmzDiGs4LBcRCh96IbWyi
+      LuNTu+0EL/zRvgXKaKkWZLGhWCIGvb5GEJ4ILsY5bpfkAbn4m+f3HS7JAqUlvru4
+      wcjZe5KhTPaLGPxheNgYxO3rlG6ltYhBe2aMXpb5bHimdj48E/+6T+dAsBZneJVn
+      PnabFcrAOhVGDFeVIOkTXzmCmW/wLthgOHRhqDQaAoVFqNwBdf5REJ9SS9j0z3a6
+      pwnKQRJIg1jZiPNxJ3hDSvJ2miYrAXhiNpSalTT1qEUSMLiXaF26uYoyHydomxX4
+      cOSngm1SEWTsslipOFpGRNJFpoAHpvQplUOcSx4nmDE7S7ozTf/4pANpRxzzpNcG
+      F5bhp6OWOTd2SHASH2LVRMJ2VvQmhrjDAx5sId7gBOF8PPwJpk07Gg/1w+KcJUxs
+      IS78Azu6V0qFDVVrQKDVUXQ6SwP5DdTlLfSwqrw6i9GWPswEFm6DQHz2PBIEIj57
+      esbxpDWwlf2Bg0RSm192NgvMLK/ksV0Gx++ld/gRBnzgI7Q2mrxMivITeff5WNH5
+      AQHrlaggp8Z4OvHDiY8wOSrlLB2iql0Hgz0RntEylFIDyysMsr44T6FEB2ZJO4Ps
+      cq8Ws/1BpLWze1HIGuiGtrdTBJ6ZzHH8HnvHdlJ2DlkSI2gmuQeLUgYbVORSlFZ3
+      VcB7glvhRXLBf8DQYNAxwXZbDzm6HSChjm/CNNOnkO1wYqUIKqCDCCVMZqSgYhYG
+      BzBcQNDmehsLaS/JcaDpaUjMXkoTIET7mmBnDvcXV2E1wFOSdGLCNMFSZqSqnYvm
+      MU4Rq5NMJvEMsdpDUl18LkCgz47iCYyBYL+ZpQP6luoUW8fnAZTxGL2ECwXyMlj4
+      rduIQSozlNMbZ/pZVsCIVqvjbZ+1HUKru9unGawZc0FBRAN6s+eSyrXbU43pfcS8
+      XoMzjqFzeCnbFYiXKZhhCN5ix5UUZhI7ElBrmZsGEx3MeHHLRm2gX0gDrCO2gEOF
+      p+IGp29HM/MRqGqCpPyWOJ+WcPWncb1LsRCyeuPbq68BwjSIPxFqRn7oW6wZK2Ax
+      NLosGnVoLkMCYbZyuJLYuilWZmq4c4YkMDMoRGLHTwa0FGg0hjQyvivMJ4rFoIpS
+      HKhDsdogLJCkwABouYNYurAAR6OyBUnZudB6cY2LJ6SiKP88CGs7YPhVxurFVUwn
+      Jou0mKP7y5OKSXIIT1LQQ9qZgDWprpBWo9GmFIkgw99UdQEByCIbzzarmAj7yjqQ
+      OS/6cQ3xvD+Dx2P6yAucYJJ6E6VmcJ58tIdEgntrlwV6Id7RzzBjtbiLYn/1Tf9n
+      oegVhN0iKILoYvlXqyXIgneFwYQMfB1YfIPkYRDxFkJCyPVwD5MheZXij6rrw76D
+      KBemHSP8AF/HlpTjprFWCRQUiLyxeEvZj5d2MJCmIkJoLLu6fC78Yy0lOQMynDuJ
+      EApUG9PyfzVTBeLVz2wit+T6C2iHin3hJySUO7aVFhmzxy23wSOaYNkwhU8bJuIa
+      r/4Xz+j3HeM5TlgEryJ2pVzsXLh7dNbFVmqrJVBnAic4DvwFzWd5TGOaRWBCYBkT
+      Jo9Vpnc2pE0rHCI2MTUqGi7VLnEosM/kyAuKJbEhZMx8kSjwGyDVS6Ymf7q6JVhA
+      O9Z8YDVLiVcbj7TpRO28Nm9MBd/AnpV4fz2oIsl3wnPoo+tCer3qvvVBi/NlLC1h
+      nipADmT8mh+Md4myWmTlHPu7hRcXQ1X2LiQVoXMqkN22m1/Ie1rloKcJZChFoxJB
+      gGdAwCgHcE03VqoRrhS7ytPHJiorty/5uRechARBUFXDGbysfoSJTgGKZLHMCeDb
+      c1gwYD+Zxi2SCzDRLY84VAawEaT8zYTaJm12hDV1gnDqhM+ECN5niavlzpvxDPn3
+      LIOQxbgwGdr3sYwJugUVb06FujfZA3VnJG+FjP1xzmpJOJyCE9X776l9kqcxPzPA
+      jwANd+hPhXy/uRGTdf5BTTMjYhTT/wxd5yFgK3O45M5PjmvzbrrMeF4GKEND0OHK
+      PJCwXdXFhxB+LXign3jeYpbxaIp+f2Wszn40NBRgeDAoMCYGA1UdDgEBAAQc5FtV
+      U3I6p8F05mM0AM6hQ/RA7l9l3Pmh0ma5bQ==
+      -----END PRIVATE KEY-----
+      
+      -----BEGIN PUBLIC KEY-----
+      MIIEuTASBg4rBgEEAYOoeAWOQwEBAgUAA4IEoQDhfDz8CaZNOxoP9cPinCVMbCEu
+      /AM7uldKhQ1Va0Cg1VF0OksD+Q3U5S30sKq8OovRlj7MBBZug0B89jwSBCI+e3rG
+      8aQ1sJX9gYNEUptfdjYLzCyv5LFdBsfvpXf4EQZ84CO0Npq8TIryE3n3+VjR+QEB
+      65WoIKfGeDrxw4mPMDkq5SwdoqpdB4M9EZ7RMpRSA8srDLK+OE+hRAdmSTuD7HKv
+      FrP9QaS1s3tRyBrohra3UwSemcxx/B57x3ZSdg5ZEiNoJrkHi1IGG1TkUpRWd1XA
+      e4Jb4UVywX/A0GDQMcF2Ww85uh0goY5vwjTTp5DtcGKlCCqggwglTGakoGIWBgcw
+      XEDQ5nobC2kvyXGg6WlIzF5KEyBE+5pgZw73F1dhNcBTknRiwjTBUmakqp2L5jFO
+      EauTTCbxDLHaQ1JdfC5AoM+O4gmMgWC/maUD+pbqFFvH5wGU8Ri9hAsF8jJY+K3b
+      iEEqM5TTG2f6WVbAiFar422ftR1Cq7vbpxmsGXNBQUQDerPnksq121ON6X3EvF6D
+      M46hc3gp2xWIlymYYQjeYseVFGYSOxJQa5mbBhMdzHhxy0ZtoF9IA6wjtoBDhafi
+      BqdvRzPzEahqgqT8ljiflnD1p3G9S7EQsnrj26uvAcI0iD8RakZ+6FusGStgMTS6
+      LBp1aC5DAmG2criS2LopVmZquHOGJDAzKERix08GtBRoNIY0Mr4rzCeKxaCKUhyo
+      Q7HaICyQpMAAaLmDWLqwAEejsgVJ2bnQenGNiyekoij/PAhrO2D4VcbqxVVMJyaL
+      tJij+8uTiklyCE9S0EPamYA1qa6QVqPRphSJIMPfVHUBAcgiG882q5gI+8o6kDkv
+      +nEN8bw/g8dj+sgLnGCSehOlZnCefLSHRIJ7a5cFeiHe0c8wY7W4i2J/9U3/Z6Ho
+      FYTdIiiC6GL5V6slyIJ3hcGEDHwdWHyD5GEQ8RZCQsj1cA+TIXmV4o+q68O+gygX
+      ph0j/ABfx5aU46axVgkUFIi8sXhL2Y+XdjCQpiJCaCy7unwu/GMtJTkDMpw7iRAK
+      VBvT8n81UwXi1c9sIrfk+gtoh4p94ScklDu2lRYZs8ctt8EjmmDZMIVPGybiGq/+
+      F8/o9x3jOU5YBK8idqVc7Fy4e3TWxVZqqyVQZwInOA78Bc1neUxjmkVgQmAZEyaP
+      VaZ3NqRNKxwiNjE1Khou1S5xKLDP5MgLiiWxIWTMfJEo8Bsg1UumJn+6uiVYQDvW
+      fGA1S4lXG4+06UTtvDZvTAXfwJ6VeH89qCLJd8Jz6KPrQnq96r71QYvzZSwtYZ4q
+      QA5k/JofjHeJslpk5Rz7u4UXF0NV9i4kFaFzKpDdtptfyHta5aCnCWQoRaMSQYBn
+      QMAoB3BNN1aqEa4Uu8rTxyYqK7cv+bkXnIQEQVBVwxm8rH6EiU4BimSxzAng23NY
+      MGA/mcYtkgsw0S2POFQGsBGk/M2E2iZtdoQ1dYJw6oTPhAjeZ4mr5c6b8Qz59yyD
+      kMW4MBna97GMCboFFW9Ohbo32QN1ZyRvhYz9cc5qSTicghPV+++pfZKnMT8zwI8A
+      DXfoT4V8v7kRk3X+QQ==
+      -----END PUBLIC KEY-----
+    Code
+      write_key(key$private, NULL)
+    Output
+      -----BEGIN PRIVATE KEY-----
+      MIIJpQIBADASBg4rBgEEAYOoeAWOQwEBAgUABIIJYAC3S+CnQiQksKYiYn9jshHE
+      kOk0P1com0rokhFaaVxFOaNRdOkSefRnPkxbbytZk20KrWmiWj51Q2bikOUKOsXR
+      fyPmZo76PfEjUe7DjwRIrLpAX2SFznx8a9wCUEBbTbW2MNl2JaPSSZwFTB6zRaCg
+      DWBLJZfcXo48FophFFybu5Ippp/EkXrxmjuVJXXEQOLHCLhmRAx7v1T6MCmLc3FK
+      ZPzck+hVP6P8Vhr4xtc3h0Acdm5sjxdVu8pHseDxLWUTDCJWFvG4jZ3ReDIZrk0J
+      HaZMBrujNyiRZMTKZafbeHeMJrchzqYwvaNylWrcWXfUZQxUufSCFNdaczdTlhYy
+      L9pUB/mJgekSMtUGiv62MVLXP1uqcY9EJ8DBlzmhl/vKq+ZRANsHkaL2bIdrMJwZ
+      J50cKhxUgZ2GYFd5FRbXL9fcjq7gRkwJzu9bG1CDhhM5XHWBVLQJd2wcSVDRBtzp
+      mxliNjJkkqrIoPSTMvNTq9jbWzjVlXAoS4dsdo7lhDBczmP6YO3MpRrIlDFxQUkj
+      hJLIoGq5WLeFNak1r1GFWoD2jGFie/aZGHipTifzbp3WanU1kstsb6xBt0PMNeej
+      Fs4mYrYihb3qNH1jO+cGCYPFwKUrVIMjqwv8JQawfFW2BnxggH0piFWAVo2Ikh9D
+      V0GqFPYbb2nbB9bBOzQ1iyvYO753ynFgwETzEQcMQdPbVCjIN15ixmS7eRQJHFvi
+      gzbKORAgIzvqsmzAziUDRYoHKqToxMrTLCunkRm1vWqAlKZ4I2OWTH8lMAYVp6I7
+      rL7qL2uAHxIpPIq1gQwYV4UgL1S0PnUFMwQ6ajmzVdhLUK4JXVUUZsAoyw/hNNHK
+      F4QUeE22g3vlXzoULLmEiVSDay44kgHZUywmdY9ZMRl3QGdXv6uCAaDrYzA7gwpJ
+      zFJ1odmzzoyJh1GJxMpjdCzWee87dlRFDRW7MPBQlR/jAxnYzmpMku0oS5SCyd+5
+      IFqwtoTDZvzHLcqarnHKQj8Wr8qjiiYzMW6jF/GHSQjTQJlEPJbyRK6KEsmhEMjx
+      TkWodsZBFNPDf79DC0SbOpeKBgtnhfhMYk52LNrCI34JfZV5SdrLxqLjAg5zek2R
+      YZqsbROZK1IGhfiEeom6qhcqP4VxhkbpJy66p610vP3cmzDiGs4LBcRCh96IbWyi
+      LuNTu+0EL/zRvgXKaKkWZLGhWCIGvb5GEJ4ILsY5bpfkAbn4m+f3HS7JAqUlvru4
+      wcjZe5KhTPaLGPxheNgYxO3rlG6ltYhBe2aMXpb5bHimdj48E/+6T+dAsBZneJVn
+      PnabFcrAOhVGDFeVIOkTXzmCmW/wLthgOHRhqDQaAoVFqNwBdf5REJ9SS9j0z3a6
+      pwnKQRJIg1jZiPNxJ3hDSvJ2miYrAXhiNpSalTT1qEUSMLiXaF26uYoyHydomxX4
+      cOSngm1SEWTsslipOFpGRNJFpoAHpvQplUOcSx4nmDE7S7ozTf/4pANpRxzzpNcG
+      F5bhp6OWOTd2SHASH2LVRMJ2VvQmhrjDAx5sId7gBOF8PPwJpk07Gg/1w+KcJUxs
+      IS78Azu6V0qFDVVrQKDVUXQ6SwP5DdTlLfSwqrw6i9GWPswEFm6DQHz2PBIEIj57
+      esbxpDWwlf2Bg0RSm192NgvMLK/ksV0Gx++ld/gRBnzgI7Q2mrxMivITeff5WNH5
+      AQHrlaggp8Z4OvHDiY8wOSrlLB2iql0Hgz0RntEylFIDyysMsr44T6FEB2ZJO4Ps
+      cq8Ws/1BpLWze1HIGuiGtrdTBJ6ZzHH8HnvHdlJ2DlkSI2gmuQeLUgYbVORSlFZ3
+      VcB7glvhRXLBf8DQYNAxwXZbDzm6HSChjm/CNNOnkO1wYqUIKqCDCCVMZqSgYhYG
+      BzBcQNDmehsLaS/JcaDpaUjMXkoTIET7mmBnDvcXV2E1wFOSdGLCNMFSZqSqnYvm
+      MU4Rq5NMJvEMsdpDUl18LkCgz47iCYyBYL+ZpQP6luoUW8fnAZTxGL2ECwXyMlj4
+      rduIQSozlNMbZ/pZVsCIVqvjbZ+1HUKru9unGawZc0FBRAN6s+eSyrXbU43pfcS8
+      XoMzjqFzeCnbFYiXKZhhCN5ix5UUZhI7ElBrmZsGEx3MeHHLRm2gX0gDrCO2gEOF
+      p+IGp29HM/MRqGqCpPyWOJ+WcPWncb1LsRCyeuPbq68BwjSIPxFqRn7oW6wZK2Ax
+      NLosGnVoLkMCYbZyuJLYuilWZmq4c4YkMDMoRGLHTwa0FGg0hjQyvivMJ4rFoIpS
+      HKhDsdogLJCkwABouYNYurAAR6OyBUnZudB6cY2LJ6SiKP88CGs7YPhVxurFVUwn
+      Jou0mKP7y5OKSXIIT1LQQ9qZgDWprpBWo9GmFIkgw99UdQEByCIbzzarmAj7yjqQ
+      OS/6cQ3xvD+Dx2P6yAucYJJ6E6VmcJ58tIdEgntrlwV6Id7RzzBjtbiLYn/1Tf9n
+      oegVhN0iKILoYvlXqyXIgneFwYQMfB1YfIPkYRDxFkJCyPVwD5MheZXij6rrw76D
+      KBemHSP8AF/HlpTjprFWCRQUiLyxeEvZj5d2MJCmIkJoLLu6fC78Yy0lOQMynDuJ
+      EApUG9PyfzVTBeLVz2wit+T6C2iHin3hJySUO7aVFhmzxy23wSOaYNkwhU8bJuIa
+      r/4Xz+j3HeM5TlgEryJ2pVzsXLh7dNbFVmqrJVBnAic4DvwFzWd5TGOaRWBCYBkT
+      Jo9Vpnc2pE0rHCI2MTUqGi7VLnEosM/kyAuKJbEhZMx8kSjwGyDVS6Ymf7q6JVhA
+      O9Z8YDVLiVcbj7TpRO28Nm9MBd/AnpV4fz2oIsl3wnPoo+tCer3qvvVBi/NlLC1h
+      nipADmT8mh+Md4myWmTlHPu7hRcXQ1X2LiQVoXMqkN22m1/Ie1rloKcJZChFoxJB
+      gGdAwCgHcE03VqoRrhS7ytPHJiorty/5uRechARBUFXDGbysfoSJTgGKZLHMCeDb
+      c1gwYD+Zxi2SCzDRLY84VAawEaT8zYTaJm12hDV1gnDqhM+ECN5niavlzpvxDPn3
+      LIOQxbgwGdr3sYwJugUVb06FujfZA3VnJG+FjP1xzmpJOJyCE9X776l9kqcxPzPA
+      jwANd+hPhXy/uRGTdf5BTTMjYhTT/wxd5yFgK3O45M5PjmvzbrrMeF4GKEND0OHK
+      PJCwXdXFhxB+LXign3jeYpbxaIp+f2Wszn40NBRgeDAoMCYGA1UdDgEBAAQc5FtV
+      U3I6p8F05mM0AM6hQ/RA7l9l3Pmh0ma5bQ==
+      -----END PRIVATE KEY-----
+    Code
+      write_key(key$public, NULL)
+    Output
+      -----BEGIN PUBLIC KEY-----
+      MIIEuTASBg4rBgEEAYOoeAWOQwEBAgUAA4IEoQDhfDz8CaZNOxoP9cPinCVMbCEu
+      /AM7uldKhQ1Va0Cg1VF0OksD+Q3U5S30sKq8OovRlj7MBBZug0B89jwSBCI+e3rG
+      8aQ1sJX9gYNEUptfdjYLzCyv5LFdBsfvpXf4EQZ84CO0Npq8TIryE3n3+VjR+QEB
+      65WoIKfGeDrxw4mPMDkq5SwdoqpdB4M9EZ7RMpRSA8srDLK+OE+hRAdmSTuD7HKv
+      FrP9QaS1s3tRyBrohra3UwSemcxx/B57x3ZSdg5ZEiNoJrkHi1IGG1TkUpRWd1XA
+      e4Jb4UVywX/A0GDQMcF2Ww85uh0goY5vwjTTp5DtcGKlCCqggwglTGakoGIWBgcw
+      XEDQ5nobC2kvyXGg6WlIzF5KEyBE+5pgZw73F1dhNcBTknRiwjTBUmakqp2L5jFO
+      EauTTCbxDLHaQ1JdfC5AoM+O4gmMgWC/maUD+pbqFFvH5wGU8Ri9hAsF8jJY+K3b
+      iEEqM5TTG2f6WVbAiFar422ftR1Cq7vbpxmsGXNBQUQDerPnksq121ON6X3EvF6D
+      M46hc3gp2xWIlymYYQjeYseVFGYSOxJQa5mbBhMdzHhxy0ZtoF9IA6wjtoBDhafi
+      BqdvRzPzEahqgqT8ljiflnD1p3G9S7EQsnrj26uvAcI0iD8RakZ+6FusGStgMTS6
+      LBp1aC5DAmG2criS2LopVmZquHOGJDAzKERix08GtBRoNIY0Mr4rzCeKxaCKUhyo
+      Q7HaICyQpMAAaLmDWLqwAEejsgVJ2bnQenGNiyekoij/PAhrO2D4VcbqxVVMJyaL
+      tJij+8uTiklyCE9S0EPamYA1qa6QVqPRphSJIMPfVHUBAcgiG882q5gI+8o6kDkv
+      +nEN8bw/g8dj+sgLnGCSehOlZnCefLSHRIJ7a5cFeiHe0c8wY7W4i2J/9U3/Z6Ho
+      FYTdIiiC6GL5V6slyIJ3hcGEDHwdWHyD5GEQ8RZCQsj1cA+TIXmV4o+q68O+gygX
+      ph0j/ABfx5aU46axVgkUFIi8sXhL2Y+XdjCQpiJCaCy7unwu/GMtJTkDMpw7iRAK
+      VBvT8n81UwXi1c9sIrfk+gtoh4p94ScklDu2lRYZs8ctt8EjmmDZMIVPGybiGq/+
+      F8/o9x3jOU5YBK8idqVc7Fy4e3TWxVZqqyVQZwInOA78Bc1neUxjmkVgQmAZEyaP
+      VaZ3NqRNKxwiNjE1Khou1S5xKLDP5MgLiiWxIWTMfJEo8Bsg1UumJn+6uiVYQDvW
+      fGA1S4lXG4+06UTtvDZvTAXfwJ6VeH89qCLJd8Jz6KPrQnq96r71QYvzZSwtYZ4q
+      QA5k/JofjHeJslpk5Rz7u4UXF0NV9i4kFaFzKpDdtptfyHta5aCnCWQoRaMSQYBn
+      QMAoB3BNN1aqEa4Uu8rTxyYqK7cv+bkXnIQEQVBVwxm8rH6EiU4BimSxzAng23NY
+      MGA/mcYtkgsw0S2POFQGsBGk/M2E2iZtdoQ1dYJw6oTPhAjeZ4mr5c6b8Qz59yyD
+      kMW4MBna97GMCboFFW9Ohbo32QN1ZyRvhYz9cc5qSTicghPV+++pfZKnMT8zwI8A
+      DXfoT4V8v7kRk3X+QQ==
+      -----END PUBLIC KEY-----
+
diff --git a/tests/testthat/test-decap_kyber.R b/tests/testthat/test-decap_kyber.R
index ac74a03..d3b13d5 100644
--- a/tests/testthat/test-decap_kyber.R
+++ b/tests/testthat/test-decap_kyber.R
@@ -72,6 +72,7 @@ test_that("kyber-x decapsulation fails on wrong parameter", {
   # Bad key
   expect_error(decap_kyber(ss$encapsulation, "not_a_key"))
 
+  # wrong family
   manipulated_key <- key
   attr(manipulated_key$private, "algorithm") <- "1.3.6.1.4.1.54392.5.1859.0"
   expect_error(decap_kyber(ss$encapsulation, manipulated_key$private))
@@ -79,6 +80,11 @@ test_that("kyber-x decapsulation fails on wrong parameter", {
   invalid_key_algo <- keygen_dilithium()
   expect_error(decap_kyber(ss$encapsulation, invalid_key_algo$private))  # invalid algorithm
 
+  # undefined algorithm, on the right 'family'
+  manipulated_key <- key
+  attr(manipulated_key$private, "algorithm") <- "1.3.6.1.4.1.54392.5.1859.1.1.99"
+  expect_error(decap_kyber(ss$encapsulation, manipulated_key$private))
+
   # Bad encapsulation
   bad_encapsulation <- as.integer(runif(768, 0, 256))   # wrong type, right size
   expect_error(decap_kyber(bad_encapsulation, key$private))
diff --git a/tests/testthat/test-encap_kyber.R b/tests/testthat/test-encap_kyber.R
index 1478d5c..8debde2 100644
--- a/tests/testthat/test-encap_kyber.R
+++ b/tests/testthat/test-encap_kyber.R
@@ -40,6 +40,11 @@ test_that("kyber-x encapsulation fails on wrong parameter", {
   attr(manipulated_key$public, "algorithm") <- "1.3.6.1.4.1.54392.5.1859.0"
   expect_error(encap_kyber(manipulated_key$public))
 
+  # undefined algorithm, on the right 'family'
+  manipulated_key <- key
+  attr(manipulated_key$public, "algorithm") <- "1.3.6.1.4.1.54392.5.1859.1.1.99"
+  expect_error(encap_kyber(manipulated_key$public))
+
   invalid_key_algo <- keygen_dilithium()
   expect_error(encap_kyber(invalid_key_algo$public))  # invalid algorithm
 })
diff --git a/tests/testthat/test-key_write.R b/tests/testthat/test-key_write.R
index a4851bc..2fbb923 100644
--- a/tests/testthat/test-key_write.R
+++ b/tests/testthat/test-key_write.R
@@ -126,3 +126,15 @@ test_that("Write Sphincs+ key-pair", {
   expect_error(write_key("not_a_key", path))
   expect_error(write_key(key, "not_a_path"))
 })
+
+test_that("Display sample key", {
+
+  key <- readRDS(test_path("testdata", "key"))
+
+  expect_snapshot({
+    write_key(key, NULL)
+    write_key(key$private, NULL)
+    write_key(key$public, NULL)
+  })
+
+})
diff --git a/tests/testthat/test-sign_dillitium.R b/tests/testthat/test-sign_dillitium.R
index 5f929b8..c700c80 100644
--- a/tests/testthat/test-sign_dillitium.R
+++ b/tests/testthat/test-sign_dillitium.R
@@ -88,6 +88,6 @@ test_that("Dilithium digital signature fails on wrong parameters", {
 
   small_key <- key$private[1:25]
   class(small_key) <- "pqcrypto_private_key"
-  attr(small_key, "algorithm") <- "dilithium"
+  attr(small_key, "algorithm") <- "1.3.6.1.4.1.54392.5.1859.1.2.1"
   expect_error(sign_dilithium(small_key, "text_message"))   # c++ error
 })
diff --git a/tests/testthat/test-sign_sphincs.R b/tests/testthat/test-sign_sphincs.R
index ce3b82f..d7035df 100644
--- a/tests/testthat/test-sign_sphincs.R
+++ b/tests/testthat/test-sign_sphincs.R
@@ -312,6 +312,6 @@ test_that("Sphincs+ digital signature fails on wrong parameters", {
 
   small_key <- key$private[1:25]
   class(small_key) <- "pqcrypto_private_key"
-  attr(small_key, "algorithm") <- "sphincs+"
+  attr(small_key, "algorithm") <- "1.3.6.1.4.1.54392.5.1859.1.3.11"
   expect_error(sign_sphincs(small_key, "text_message"))   # wrong key size
 })
diff --git a/tests/testthat/test-verify_dilithium.R b/tests/testthat/test-verify_dilithium.R
index 6616246..cd03d76 100644
--- a/tests/testthat/test-verify_dilithium.R
+++ b/tests/testthat/test-verify_dilithium.R
@@ -72,4 +72,10 @@ test_that("Digital signatures verification fails with bad parameters", {
 
   key <- keygen_kyber()
   expect_error(verify_dilithium(important_message, signature, key$public)) # bad key algorithm
+
+  key <- keygen_sphincs()
+  expect_error(verify_dilithium(important_message, signature, key$public)) # bad key algorithm
+
+  key <- keygen_dilithium()
+  expect_error(verify_dilithium(important_message, signature, key$public)) # mismatching key
 })
diff --git a/tests/testthat/test-verify_sphincs.R b/tests/testthat/test-verify_sphincs.R
index 35c9330..12ea02c 100644
--- a/tests/testthat/test-verify_sphincs.R
+++ b/tests/testthat/test-verify_sphincs.R
@@ -246,4 +246,10 @@ test_that("Sphincs+ digital signatures verification fails with bad parameters",
   key <- keygen_dilithium()
   expect_error(verify_sphincs(important_message, signature, key$public)) # bad key algorithm
 
+  key <- keygen_kyber()
+  expect_error(verify_sphincs(important_message, signature, key$public)) # bad key algorithm
+
+  key <- keygen_sphincs()
+  expect_error(verify_sphincs(important_message, signature, key$public)) # mismatching key
+
 })
diff --git a/tests/testthat/testdata/key b/tests/testthat/testdata/key
new file mode 100644
index 0000000..9c4bfac
Binary files /dev/null and b/tests/testthat/testdata/key differ