Add entry for CHANGELOG

Author: sroda

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Add metrics basic tests to BaseTest class
+  ([#3092](https://github.com/open-telemetry/opentelemetry-python/pull/3092))
+
 ## Version 1.15.0/0.36b0 (2022-12-09)
 
 - Regenerate opentelemetry-proto to be compatible with protobuf 3 and 4

tests/opentelemetry-test-utils/src/opentelemetry/test/test_base.py

@@ -20,8 +20,12 @@
 from opentelemetry import metrics as metrics_api
 from opentelemetry import trace as trace_api
 from opentelemetry.sdk.metrics import MeterProvider
-from opentelemetry.sdk.metrics.export import (InMemoryMetricReader, MetricReader, HistogramDataPoint,
-    NumberDataPoint)
+from opentelemetry.sdk.metrics.export import (
+    HistogramDataPoint,
+    InMemoryMetricReader,
+    MetricReader,
+    NumberDataPoint,
+)
 
 from opentelemetry.sdk.trace import TracerProvider, export
 from opentelemetry.sdk.trace.export.in_memory_span_exporter import (
@@ -106,7 +110,7 @@ def get_sorted_metrics(self):
                 return self.sorted_metrics(all_metrics)
 
     def assert_metric_expected(
-            self, metric, expected_value, expected_attributes
+        self, metric, expected_value, expected_attributes
     ):
         data_point = next(iter(metric.data.data_points))
 
@@ -127,7 +131,7 @@ def assert_metric_expected(
         )
 
     def assert_duration_metric_expected(
-            self, metric, duration_estimated, expected_attributes, est_delta=200
+        self, metric, duration_estimated, expected_attributes, est_delta=200
     ):
         data_point = next(iter(metric.data.data_points))