Canonicalise deps to fixpoint

Author: Zac-HD

src/hypothesis_jsonschema/_canonicalise.py

@@ -461,6 +461,8 @@ def canonicalish(schema: JSONType) -> Dict[str, Any]:
                     # TODO: else merge schema-dependencies of required properties
                     # into the base schema after adding required back in and being
                     # careful to avoid an infinite loop...
+            if not schema["dependencies"]:
+                schema.pop("dependencies")
         schema["required"] = sorted(reqs)
         max_ = schema.get("maxProperties", float("inf"))
         assert isinstance(max_, (int, float))

tests/test_canonicalise.py

@@ -53,6 +53,14 @@ def test_canonicalises_to_equivalent_fixpoint(schema_strategy, data):
     jsonschema.validators.validator_for(schema).check_schema(schema)
 
 
+def test_dependencies_canonicalises_to_fixpoint():
+    """Check that an object drawn from an arbitrary schema is valid."""
+    cc = canonicalish(
+        {"required": [""], "properties": {"": {}}, "dependencies": {"": [""]}}
+    )
+    assert cc == canonicalish(cc)
+
+
 @pytest.mark.parametrize(
     "schema",
     [