diff --git a/QuantumNexusProtocol/tests/test_blockchain.py b/QuantumNexusProtocol/tests/test_blockchain.py
new file mode 100644
index 000000000..51abb6673
--- /dev/null
+++ b/QuantumNexusProtocol/tests/test_blockchain.py
@@ -0,0 +1,23 @@
+import unittest
+from src.core.blockchain import Blockchain
+
+class TestBlockchain(unittest.TestCase):
+    def setUp(self):
+        self.blockchain = Blockchain()
+
+    def test_initial_block(self):
+        self.assertEqual(len(self.blockchain.chain), 1)
+        self.assertEqual(self.blockchain.chain[0]['index'], 1)
+
+    def test_add_block(self):
+        previous_length = len(self.blockchain.chain)
+        self.blockchain.add_block(data="Test Block")
+        self.assertEqual(len(self.blockchain.chain), previous_length + 1)
+
+    def test_chain_integrity(self):
+        self.blockchain.add_block(data="Block 1")
+        self.blockchain.add_block(data="Block 2")
+        self.assertTrue(self.blockchain.is_chain_valid())
+
+if __name__ == '__main__':
+    unittest.main()