refactor(tests): fix encoding test, add fuzzing

Author: fubuloubu

setup.py

@@ -7,7 +7,8 @@
         "pytest>=6.0",  # Core testing package
         "pytest-xdist",  # Multi-process runner
         "pytest-cov",  # Coverage analyzer plugin
-        # "hypothesis>=6.2.0,<7.0",  # Strategy-based fuzzer
+        "hypothesis",  # Strategy-based fuzzer
+        "hypothesis-jsonschema",  # Generate strategies for pydantic models
     ],
     "lint": [
         "black>=24",  # Auto-formatter and linter

tests/test_cluster.py

@@ -1,13 +1,25 @@
-import uuid
+from eth_utils import to_checksum_address
+from hypothesis import given
+from hypothesis import strategies as st
+from hypothesis_jsonschema import from_schema
 
 from silverback.cluster.types import ClusterConfiguration
 
+CONFIG_SCHEMA = ClusterConfiguration.model_json_schema()
 
-def test_hmac_signature():
-    config = ClusterConfiguration()
-    cluster_id = uuid.uuid4()
-    owner = "0x4838B106FCe9647Bdf1E7877BF73cE8B0BAD5f97"
+
+@given(  # type: ignore[call-overload]
+    cluster_id=st.uuids(version=4),
+    owner=st.binary(min_size=20, max_size=20).map(to_checksum_address),
+    config_dict=from_schema(CONFIG_SCHEMA),
+)
+def test_hmac_signature(cluster_id, owner, config_dict):
+    # NOTE: Ignore `version` fuzzed value
+    config_dict["version"] = 1
+    config = ClusterConfiguration(**config_dict)
     product_code = config.get_product_code(owner, cluster_id)
+    # NOTE: There is a gap of empty bytes between 8-16
+    encoded_config, sig = product_code[:8], product_code[16:]
     # NOTE: Ensure we can properly decode the encoded product code into a configuration
-    assert config == ClusterConfiguration.decode(product_code[:16])
-    assert config.validate_product_code(owner, product_code[16:], cluster_id)
+    assert config == ClusterConfiguration.decode(encoded_config)
+    assert config.validate_product_code(owner, sig, cluster_id)