test: moved preferred_aggregation test to class

Author: Dudssource

exporter/opentelemetry-exporter-otlp-proto-grpc/tests/test_otlp_metrics_exporter.py

@@ -968,6 +968,22 @@ def test_exponential_explicit_bucket_histogram(self):
                 ExplicitBucketHistogramAggregation,
             )
 
+    def test_preferred_aggregation_override(self):
+
+        histogram_aggregation = ExplicitBucketHistogramAggregation(
+            boundaries=[0.05, 0.1, 0.5, 1, 5, 10],
+        )
+
+        exporter = OTLPMetricExporter(
+            preferred_aggregation={
+                Histogram: histogram_aggregation,
+            },
+        )
+
+        self.assertEqual(
+            exporter._preferred_aggregation[Histogram], histogram_aggregation
+        )
+
 
 def _resource_metrics(
     index: int, scope_metrics: List[ScopeMetrics]
@@ -1006,19 +1022,3 @@ def _number_data_point(value: int) -> NumberDataPoint:
         time_unix_nano=1641946016139533244,
         value=value,
     )
-
-def test_preferred_aggregation_override(self):
-
-    histogram_aggregation = ExplicitBucketHistogramAggregation(
-        boundaries=[0.05, 0.1, 0.5, 1, 5, 10],
-    )
-
-    exporter = OTLPMetricExporter(
-        preferred_aggregation={
-            Histogram: histogram_aggregation,
-        },
-    )
-
-    self.assertEqual(
-        exporter._preferred_aggregation[Histogram], histogram_aggregation
-    )