refactor tests and add changelog entry

Author: liustve

CHANGELOG.md

@@ -15,6 +15,8 @@ If your change does not need a CHANGELOG entry, add the "skip changelog" label t
 
 ### Enhancements
 
+- Add Application Signals Dimensions to EMF exporter
+  ([#1264](https://github.com/aws-observability/aws-otel-java-instrumentation/pull/1264))
 - Configure EMF and CompactLog Exporters for Lambda Environment
   ([#1222](https://github.com/aws-observability/aws-otel-java-instrumentation/pull/1222))
 - feat: [Java] EMF Exporter Implementation

awsagentprovider/src/test/java/software/amazon/opentelemetry/javaagent/providers/exporter/aws/metrics/BaseEmfExporterTest.java

@@ -67,10 +67,10 @@ public abstract class BaseEmfExporterTest<T> {
 
   @BeforeEach
   void setup() {
-    capturedLogEvents = new ArrayList<>();
-    mockEmitter = createEmitter();
-    exporter = buildExporter(false);
-    metricData = mock(MetricData.class);
+    this.capturedLogEvents = new ArrayList<>();
+    this.mockEmitter = this.createEmitter();
+    this.exporter = this.buildExporter(false);
+    this.metricData = mock(MetricData.class);
 
     doAnswer(
             invocation -> {