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test(ai): cover nested config mutation in the cache-pollution test#802

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Merged
jurajmajerik merged 2 commits into from
Jul 30, 2026
Merged

test(ai): cover nested config mutation in the cache-pollution test #802

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efa5653
test(ai): cover nested config mutation in the cache-pollution test
jurajmajerik Jul 30, 2026
3de5d57
chore: regenerate public api snapshot for prompt config
jurajmajerik Jul 30, 2026
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17 changes: 15 additions & 2 deletions posthog/test/ai/test_prompts.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -820,9 +820,15 @@ def test_mutating_a_result_config_does_not_pollute_the_cache(
self, mock_get_session
):
"""Callers often mutate config before spreading it into an LLM call; that must not leak into later cache hits."""
# Nested values included: a shallow copy would pass the top-level mutations
# below but leak the nested one into the cache.
nested_config = {
"model": "gpt-4o",
"tools": [{"name": "search", "parameters": {"depth": 1}}],
}
mock_get = mock_get_session.return_value.get
mock_get.return_value = MockResponse(
json_data={**self.mock_prompt_response, "config": self.mock_config}
json_data={**self.mock_prompt_response, "config": nested_config}
)

prompts = Prompts(self.create_mock_posthog())
Expand All@@ -831,11 +837,18 @@ def test_mutating_a_result_config_does_not_pollute_the_cache(
assert first.config is not None
first.config["temperature"] = 0.9
first.config.pop("model")
first.config["tools"][0]["parameters"]["depth"] = 99

second = prompts.get("test-prompt", with_metadata=True)

self.assertEqual(second.source, "cache")
self.assertEqual(second.config, self.mock_config)
self.assertEqual(
second.config,
{
"model": "gpt-4o",
"tools": [{"name": "search", "parameters": {"depth": 1}}],
},
)

@parameterized.expand(
[
Expand Down
6 changes: 4 additions & 2 deletions references/public_api_snapshot.txt
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Expand Up@@ -425,13 +425,15 @@ attribute posthog.ai.openai_agents.processor.log = logging.getLogger('posthog')
attribute posthog.ai.otel.spans.AI_SPAN_PREFIXES = ('gen_ai.', 'llm.', 'ai.', 'traceloop.')
attribute posthog.ai.otel.spans.DEFAULT_HOST = 'https://us.i.posthog.com'
attribute posthog.ai.prompts.APP_ENDPOINT = 'https://us.posthog.com'
attribute posthog.ai.prompts.CachedPrompt.config = config
attribute posthog.ai.prompts.CachedPrompt.fetched_at = fetched_at
attribute posthog.ai.prompts.CachedPrompt.label = label
attribute posthog.ai.prompts.CachedPrompt.name = name
attribute posthog.ai.prompts.CachedPrompt.prompt = prompt
attribute posthog.ai.prompts.CachedPrompt.version = version
attribute posthog.ai.prompts.DEFAULT_CACHE_TTL_SECONDS = 300
attribute posthog.ai.prompts.PromptCacheKey = tuple[str, Optional[int], Optional[str]]
attribute posthog.ai.prompts.PromptResult.config: Optional[Dict[str, Any]] = None
attribute posthog.ai.prompts.PromptResult.label: Optional[str] = None
attribute posthog.ai.prompts.PromptResult.name: Optional[str] = None
attribute posthog.ai.prompts.PromptResult.prompt: str
Expand DownExpand Up@@ -887,8 +889,8 @@ class posthog.ai.openai.openai_providers.AzureOpenAI(posthog_client: Optional[Po
class posthog.ai.openai_agents.processor.PostHogTracingProcessor(client: Optional[Client] = None, distinct_id: Optional[Union[str, Callable[[Trace], Optional[str]]]] = None, privacy_mode: bool = False, groups: Optional[Dict[str, Any]] = None, properties: Optional[Dict[str, Any]] = None)
class posthog.ai.otel.exporter.PostHogTraceExporter(api_key: str, host: str = DEFAULT_HOST)
class posthog.ai.otel.processor.PostHogSpanProcessor(api_key: str, host: str = DEFAULT_HOST)
class posthog.ai.prompts.CachedPrompt(prompt: str, fetched_at: float, name: str, version: int, label: Optional[str] = None)
class posthog.ai.prompts.PromptResult(source: PromptSource, prompt: str, name: Optional[str] = None, version: Optional[int] = None, label: Optional[str] = None)
class posthog.ai.prompts.CachedPrompt(prompt: str, fetched_at: float, name: str, version: int, label: Optional[str] = None, config: Optional[Dict[str, Any]] = None)
class posthog.ai.prompts.PromptResult(source: PromptSource, prompt: str, name: Optional[str] = None, version: Optional[int] = None, label: Optional[str] = None, config: Optional[Dict[str, Any]] = None)
class posthog.ai.prompts.Prompts(posthog: Optional[Any] = None, *, personal_api_key: Optional[str] = None, project_api_key: Optional[str] = None, host: Optional[str] = None, default_cache_ttl_seconds: Optional[int] = None, capture_errors: bool = False)
class posthog.ai.stream.AsyncStreamWrapper(generator: AsyncGenerator[T, None], stream: Optional[Any] = None)
class posthog.ai.types.FormattedFunctionCall
Expand Down