diff --git a/tests/unit-tests/transport/test-homes/tcp-transport/bad-malformed-uri/.ndn/client.conf b/tests/unit-tests/transport/test-homes/tcp-transport/bad-malformed-uri/.ndn/client.conf
index 872a17a..d4714da 100644
--- a/tests/unit-tests/transport/test-homes/tcp-transport/bad-malformed-uri/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/tcp-transport/bad-malformed-uri/.ndn/client.conf
@@ -1 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
+
 transport=tcp
\ No newline at end of file
diff --git a/tests/unit-tests/transport/test-homes/tcp-transport/bad-missing-host/.ndn/client.conf b/tests/unit-tests/transport/test-homes/tcp-transport/bad-missing-host/.ndn/client.conf
index c09f144..7f7dd5e 100644
--- a/tests/unit-tests/transport/test-homes/tcp-transport/bad-missing-host/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/tcp-transport/bad-missing-host/.ndn/client.conf
@@ -1 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
+
 transport=tcp://:6000
\ No newline at end of file
diff --git a/tests/unit-tests/transport/test-homes/tcp-transport/bad-wrong-transport/.ndn/client.conf b/tests/unit-tests/transport/test-homes/tcp-transport/bad-wrong-transport/.ndn/client.conf
index 1ee2a2f..7f8065a 100644
--- a/tests/unit-tests/transport/test-homes/tcp-transport/bad-wrong-transport/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/tcp-transport/bad-wrong-transport/.ndn/client.conf
@@ -1 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
+
 transport=unix://
\ No newline at end of file
diff --git a/tests/unit-tests/transport/test-homes/tcp-transport/ok-omitted-host-omitted-port/.ndn/client.conf b/tests/unit-tests/transport/test-homes/tcp-transport/ok-omitted-host-omitted-port/.ndn/client.conf
index d09dff3..182f47c 100644
--- a/tests/unit-tests/transport/test-homes/tcp-transport/ok-omitted-host-omitted-port/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/tcp-transport/ok-omitted-host-omitted-port/.ndn/client.conf
@@ -1 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
+
 transport=tcp://
\ No newline at end of file
diff --git a/tests/unit-tests/transport/test-homes/tcp-transport/ok-omitted-port/.ndn/client.conf b/tests/unit-tests/transport/test-homes/tcp-transport/ok-omitted-port/.ndn/client.conf
index 8ce375b..95b5ccc 100644
--- a/tests/unit-tests/transport/test-homes/tcp-transport/ok-omitted-port/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/tcp-transport/ok-omitted-port/.ndn/client.conf
@@ -1 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
+
 transport=tcp://127.0.0.1
\ No newline at end of file
diff --git a/tests/unit-tests/transport/test-homes/tcp-transport/ok/.ndn/client.conf b/tests/unit-tests/transport/test-homes/tcp-transport/ok/.ndn/client.conf
index 2dbad7a..4c2d8c0 100644
--- a/tests/unit-tests/transport/test-homes/tcp-transport/ok/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/tcp-transport/ok/.ndn/client.conf
@@ -1 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
+
 transport=tcp://127.0.0.1:6000
diff --git a/tests/unit-tests/transport/test-homes/unix-transport/bad-malformed-uri/.ndn/client.conf b/tests/unit-tests/transport/test-homes/unix-transport/bad-malformed-uri/.ndn/client.conf
index 9d981af..427a2db 100644
--- a/tests/unit-tests/transport/test-homes/unix-transport/bad-malformed-uri/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/unix-transport/bad-malformed-uri/.ndn/client.conf
@@ -1 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
+
 transport=unix
\ No newline at end of file
diff --git a/tests/unit-tests/transport/test-homes/unix-transport/bad-wrong-transport/.ndn/client.conf b/tests/unit-tests/transport/test-homes/unix-transport/bad-wrong-transport/.ndn/client.conf
index d09dff3..182f47c 100644
--- a/tests/unit-tests/transport/test-homes/unix-transport/bad-wrong-transport/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/unix-transport/bad-wrong-transport/.ndn/client.conf
@@ -1 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
+
 transport=tcp://
\ No newline at end of file
diff --git a/tests/unit-tests/transport/test-homes/unix-transport/ok-omitted-unix-socket-omitted-protocol/.ndn/client.conf b/tests/unit-tests/transport/test-homes/unix-transport/ok-omitted-unix-socket-omitted-protocol/.ndn/client.conf
index e69de29..2c4c027 100644
--- a/tests/unit-tests/transport/test-homes/unix-transport/ok-omitted-unix-socket-omitted-protocol/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/unix-transport/ok-omitted-unix-socket-omitted-protocol/.ndn/client.conf
@@ -0,0 +1,3 @@
+; Empty client.conf is unfeasible in automated tests,
+; see tests/unit-tests/security/config-file-readme.txt.
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
\ No newline at end of file
diff --git a/tests/unit-tests/transport/test-homes/unix-transport/ok-omitted-unix-socket-with-protocol/.ndn/client.conf b/tests/unit-tests/transport/test-homes/unix-transport/ok-omitted-unix-socket-with-protocol/.ndn/client.conf
index f9ca264..8fae7f5 100644
--- a/tests/unit-tests/transport/test-homes/unix-transport/ok-omitted-unix-socket-with-protocol/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/unix-transport/ok-omitted-unix-socket-with-protocol/.ndn/client.conf
@@ -1,2 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
 
 protocol=nrd-0.1
diff --git a/tests/unit-tests/transport/test-homes/unix-transport/ok/.ndn/client.conf b/tests/unit-tests/transport/test-homes/unix-transport/ok/.ndn/client.conf
index cb3fae3..ce8b950 100644
--- a/tests/unit-tests/transport/test-homes/unix-transport/ok/.ndn/client.conf
+++ b/tests/unit-tests/transport/test-homes/unix-transport/ok/.ndn/client.conf
@@ -1,2 +1,3 @@
+pib=pib-sqlite3:/tmp/test/ndn-cxx/keychain/sqlite3-empty/
 
 transport=unix:///tmp/test/nfd.sock
diff --git a/tests/unit-tests/transport/test-unix-transport.cpp b/tests/unit-tests/transport/test-unix-transport.cpp
index 8d5548c..bad7dc0 100644
--- a/tests/unit-tests/transport/test-unix-transport.cpp
+++ b/tests/unit-tests/transport/test-unix-transport.cpp
@@ -26,8 +26,6 @@
 
 namespace ndn {
 
-
-
 BOOST_FIXTURE_TEST_SUITE(TransportTestUnixTransport, TransportFixture)
 
 BOOST_AUTO_TEST_CASE(GetDefaultSocketNameOk)