add test to ensure backwards compat

Author: breedx-splk

sdk/metrics/src/test/java/io/opentelemetry/sdk/metrics/internal/SdkMeterProviderUtilTest.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.sdk.metrics.internal;
+
+import static org.assertj.core.api.Assertions.as;
+import static org.assertj.core.api.Assertions.assertThat;
+
+import io.opentelemetry.sdk.metrics.SdkMeterProvider;
+import io.opentelemetry.sdk.metrics.SdkMeterProviderBuilder;
+import io.opentelemetry.sdk.metrics.exemplar.ExemplarFilter;
+import org.assertj.core.api.InstanceOfAssertFactories;
+import org.junit.jupiter.api.Test;
+
+class SdkMeterProviderUtilTest {
+
+  @SuppressWarnings(
+      "deprecation") // Temporary deprecation to allow transition (remove after 1.55.0)
+  @Test
+  void setExemplarFilter() {
+    SdkMeterProviderBuilder builder = SdkMeterProvider.builder();
+    SdkMeterProviderUtil.setExemplarFilter(builder, ExemplarFilter.alwaysOn());
+    assertThat(builder)
+        .extracting("exemplarFilter", as(InstanceOfAssertFactories.type(ExemplarFilter.class)))
+        .isEqualTo(ExemplarFilter.alwaysOn());
+  }
+}