test(otel): add regression tests for "none" exporter handling

Covers get_settings() filtering, provider None returns, and the
wrap_in_fastapi no-crash regression for OTEL_TRACES_EXPORTER=none
and OTEL_METRICS_EXPORTER=none.

Author: micmarty-deepsense

test/test_otel.py

@@ -0,0 +1,70 @@
+import pytest
+from opentelemetry.environment_variables import OTEL_METRICS_EXPORTER, OTEL_TRACES_EXPORTER
+from opentelemetry.sdk.metrics import MeterProvider
+from opentelemetry.sdk.trace import TracerProvider
+
+from unstructured_platform_plugins.etl_uvicorn.otel import (
+    get_metric_provider,
+    get_settings,
+    get_trace_provider,
+)
+
+
+def test_get_settings_filters_none_from_traces(monkeypatch):
+    monkeypatch.setenv(OTEL_TRACES_EXPORTER, "none")
+    settings = get_settings()
+    assert settings["trace_exporters"] == []
+
+
+def test_get_settings_filters_none_from_metrics(monkeypatch):
+    monkeypatch.setenv(OTEL_METRICS_EXPORTER, "none")
+    settings = get_settings()
+    assert settings["metric_exporters"] == []
+
+
+def test_get_settings_filters_none_from_combined_trace_exporters(monkeypatch):
+    monkeypatch.setenv(OTEL_TRACES_EXPORTER, "none,console")
+    settings = get_settings()
+    assert settings["trace_exporters"] == ["console"]
+
+
+def test_get_settings_filters_none_from_combined_metric_exporters(monkeypatch):
+    monkeypatch.setenv(OTEL_METRICS_EXPORTER, "none,console")
+    settings = get_settings()
+    assert settings["metric_exporters"] == ["console"]
+
+
+def test_get_trace_provider_returns_none_when_exporter_is_none(monkeypatch):
+    monkeypatch.setenv(OTEL_TRACES_EXPORTER, "none")
+    assert get_trace_provider() is None
+
+
+def test_get_metric_provider_returns_none_when_exporter_is_none(monkeypatch):
+    monkeypatch.setenv(OTEL_METRICS_EXPORTER, "none")
+    assert get_metric_provider() is None
+
+
+def test_get_trace_provider_returns_provider_when_exporter_set(monkeypatch):
+    monkeypatch.setenv(OTEL_TRACES_EXPORTER, "console")
+    provider = get_trace_provider()
+    assert isinstance(provider, TracerProvider)
+
+
+def test_get_metric_provider_returns_provider_when_exporter_set(monkeypatch):
+    monkeypatch.setenv(OTEL_METRICS_EXPORTER, "console")
+    provider = get_metric_provider()
+    assert isinstance(provider, MeterProvider)
+
+
+def test_wrap_in_fastapi_does_not_crash_with_none_otel_exporters(monkeypatch):
+    """Regression: previously crashed with NotImplementedError when none was set."""
+    monkeypatch.setenv(OTEL_TRACES_EXPORTER, "none")
+    monkeypatch.setenv(OTEL_METRICS_EXPORTER, "none")
+
+    from test.assets.async_typed_dict_response import async_sample_function
+
+    from unstructured_platform_plugins.etl_uvicorn.api_generator import wrap_in_fastapi
+
+    # Should not raise NotImplementedError
+    app = wrap_in_fastapi(func=async_sample_function, plugin_id="test_plugin")
+    assert app is not None