Address review comments: remove auto-gen CHANGELOG, keyword-only init, assert api_key serialization

Author: jliounis

integrations/perplexity/CHANGELOG.md

@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-from haystack_integrations.components.websearch.perplexity.perplexity_websearch import PerplexityWebSearch
+from haystack_integrations.components.websearch.perplexity.perplexity_websearch import (
+    PerplexityWebSearch,
+)
 
 __all__ = ["PerplexityWebSearch"]

integrations/perplexity/src/haystack_integrations/components/websearch/perplexity/__init__.py

@@ -52,6 +52,7 @@ class PerplexityWebSearch:
 
     def __init__(
         self,
+        *,
         api_key: Secret = Secret.from_env_var("PERPLEXITY_API_KEY"),
         top_k: int | None = 10,
         search_params: dict[str, Any] | None = None,

integrations/perplexity/src/haystack_integrations/components/websearch/perplexity/perplexity_websearch.py

@@ -72,6 +72,7 @@ def test_to_dict(self, monkeypatch):
         data = component_to_dict(ws, "PerplexityWebSearch")
         expected_type = "haystack_integrations.components.websearch.perplexity.perplexity_websearch.PerplexityWebSearch"
         assert data["type"] == expected_type
+        assert data["init_parameters"]["api_key"] == Secret.from_env_var("PERPLEXITY_API_KEY").to_dict()
         assert data["init_parameters"]["top_k"] == 5
         assert data["init_parameters"]["search_params"] == {"country": "US"}
 
@@ -83,7 +84,11 @@ def test_from_dict(self, monkeypatch):
                 "top_k": 3,
                 "search_params": {"search_recency_filter": "day"},
                 "timeout": 15.0,
-                "api_key": {"env_vars": ["PERPLEXITY_API_KEY"], "strict": True, "type": "env_var"},
+                "api_key": {
+                    "env_vars": ["PERPLEXITY_API_KEY"],
+                    "strict": True,
+                    "type": "env_var",
+                },
             },
         }
         ws = component_from_dict(PerplexityWebSearch, data, "PerplexityWebSearch")
@@ -153,7 +158,11 @@ def test_run_uses_init_search_params_when_no_runtime_override(self):
         ws.run(query="hello")
 
         body = json.loads(captured[0].content)
-        assert body == {"query": "hello", "search_recency_filter": "week", "max_results": 5}
+        assert body == {
+            "query": "hello",
+            "search_recency_filter": "week",
+            "max_results": 5,
+        }
 
     @pytest.mark.asyncio
     async def test_run_async(self):