fix test

Author: zeitlinger

testing-common/src/main/java/io/opentelemetry/instrumentation/testing/provider/TestExporterCustomizerProvider.java

@@ -26,6 +26,12 @@
 import java.util.List;
 
 public class TestExporterCustomizerProvider implements DeclarativeConfigurationCustomizerProvider {
+
+  @Override
+  public int order() {
+    return Integer.MIN_VALUE; // run before other customizers that might add exporters
+  }
+
   @Override
   public void customize(DeclarativeConfigurationCustomizer customizer) {
     if (TestSpanExporterComponentProvider.getSpanExporter() == null) {

testing/agent-exporter/src/main/java/io/opentelemetry/javaagent/testing/provider/AgentTestExporterCustomizerProvider.java

@@ -30,6 +30,12 @@
 @AutoService(DeclarativeConfigurationCustomizerProvider.class)
 public class AgentTestExporterCustomizerProvider
     implements DeclarativeConfigurationCustomizerProvider {
+
+  @Override
+  public int order() {
+    return Integer.MIN_VALUE; // run before other customizers that might add exporters
+  }
+
   @Override
   public void customize(DeclarativeConfigurationCustomizer customizer) {
     TestExportersUtil.initTestExporters();