Create test_block.py

tests/test_block.py

@@ -0,0 +1,31 @@
+import unittest
+from block import Block
+
+class TestBlock(unittest.TestCase):
+    def test_create_block(self):
+        block = Block(1, "previous_hash", "data", 1234567890)
+        self.assertEqual(block.index, 1)
+        self.assertEqual(block.previous_hash, "previous_hash")
+        self.assertEqual(block.data, "data")
+        self.assertEqual(block.timestamp, 1234567890)
+        self.assertEqual(block.hash, "hash_value")  # Replace with actual hash value
+
+    def test_calculate_hash(self):
+        block = Block(1, "previous_hash", "data", 1234567890)
+        self.assertEqual(block.calculate_hash(), "hash_value")  # Replace with actual hash value
+
+    def test_is_valid(self):
+        block = Block(1, "previous_hash", "data", 1234567890)
+        self.assertTrue(block.is_valid())
+
+        # Test invalid block with modified data
+        block.data = "modified_data"
+        self.assertFalse(block.is_valid())
+
+        # Test invalid block with modified previous hash
+        block.previous_hash = "modified_previous_hash"
+        self.assertFalse(block.is_valid())
+
+        # Test invalid block with modified index
+        block.index = 2
+        self.assertFalse(block.is_valid())