fix: add unit test for hexbits

Author: aimxhaisse

tests/test_hexbits.py

@@ -0,0 +1,40 @@
+import unittest
+
+from eth_validator_watcher.duties import hex_to_sparse_bitset
+
+
+class HexBitsTestCase(unittest.TestCase):
+    """Test case for hex_to_sparse_bitset function."""
+
+    def test_hex_to_sparse_bitset_zero(self) -> None:
+        """Test hex_to_sparse_bitset() with a zero hex value."""
+        result = hex_to_sparse_bitset("0x00")
+        self.assertEqual(result, set())
+
+    def test_hex_to_sparse_bitset_with_prefix(self) -> None:
+        """Test hex_to_sparse_bitset() with 0x prefix."""
+        # 0000 0101
+        result = hex_to_sparse_bitset("0x05")
+        self.assertEqual(result, {5, 7})
+
+    def test_hex_to_sparse_bitset_without_prefix(self) -> None:
+        """Test hex_to_sparse_bitset() without 0x prefix."""
+        # 0000 0101
+        result = hex_to_sparse_bitset("05")
+        self.assertEqual(result, {5, 7})
+
+    def test_hex_to_sparse_bitset_complex(self) -> None:
+        """Test hex_to_sparse_bitset() with a complex hex value."""
+        # 1010 0101
+        result = hex_to_sparse_bitset("0xA5")
+        self.assertEqual(result, {0, 2, 5, 7})
+
+    def test_hex_to_sparse_bitset_multi_byte(self) -> None:
+        """Test hex_to_sparse_bitset() with a multi-byte hex value."""
+        # 0001 0010 0011 0100
+        result = hex_to_sparse_bitset("0x1234")
+        self.assertEqual(result, {3, 6, 10, 11, 13})
+
+
+if __name__ == "__main__":
+    unittest.main()