diff --git a/tests/core/peer/test_peerdata.py b/tests/core/peer/test_peerdata.py
index f2d76643..24730844 100644
--- a/tests/core/peer/test_peerdata.py
+++ b/tests/core/peer/test_peerdata.py
@@ -6,10 +6,12 @@ from multiaddr import Multiaddr
 from libp2p.crypto.secp256k1 import (
     create_new_key_pair,
 )
+from libp2p.peer.id import ID
 from libp2p.peer.peerdata import (
     PeerData,
     PeerDataError,
 )
+from libp2p.peer.peerstore import PeerStore
 
 MOCK_ADDR = Multiaddr("/ip4/127.0.0.1/tcp/4001")
 MOCK_KEYPAIR = create_new_key_pair()
@@ -60,6 +62,7 @@ def test_supports_protocols():
     assert supported == ["protocol1", "protocol2"]
 
 
+# Test case for first supported protocol is found
 def test_first_supported_protocol_found():
     peer_data = PeerData()
     peer_data.set_protocols(["protocolA", "protocolB"])
@@ -70,6 +73,7 @@ def test_first_supported_protocol_found():
     assert first == "protocolB"
 
 
+# Test case for first supported protocol not found
 def test_first_supported_protocol_none():
     peer_data = PeerData()
     peer_data.set_protocols(["protocolX", "protocolY"])
@@ -80,6 +84,7 @@ def test_first_supported_protocol_none():
     assert first == "None supported"
 
 
+# Test case for clearing protocol data
 def test_clear_protocol_data():
     peer_data = PeerData()
     peer_data.set_protocols(["proto1", "proto2"])
@@ -159,6 +164,42 @@ def test_get_privkey_not_found():
         peer_data.get_privkey()
 
 
+# Test case for returning all the peers with stored keys
+def test_peer_with_keys():
+    peer_store = PeerStore()
+    peer_id_1 = ID(b"peer1")
+    peer_id_2 = ID(b"peer2")
+
+    peer_data_1 = PeerData()
+    peer_data_2 = PeerData()
+
+    peer_data_1.pubkey = MOCK_PUBKEY
+    peer_data_2.pubkey = None
+
+    peer_store.peer_data_map = {
+        peer_id_1: peer_data_1,
+        peer_id_2: peer_data_2,
+    }
+
+    assert peer_store.peer_with_keys() == [peer_id_1]
+
+
+# Test case for clearing the key book
+def test_clear_keydata():
+    peer_store = PeerStore()
+    peer_id = ID(b"peer123")
+    peer_data = PeerData()
+
+    peer_data.pubkey = MOCK_PUBKEY
+    peer_data.privkey = MOCK_PRIVKEY
+    peer_store.peer_data_map = {peer_id: peer_data}
+
+    peer_store.clear_keydata(peer_id)
+
+    assert peer_data.pubkey is None
+    assert peer_data.privkey is None
+
+
 # Test case for recording latency for the first time
 def test_record_latency_initial():
     peer_data = PeerData()