add AWS resource integration test

Author: zeitlinger

javaagent/src/test/java/io/opentelemetry/javaagent/ResourceProviderTest.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.javaagent;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.util.ServiceLoader;
+import org.junit.jupiter.api.Test;
+
+public class ResourceProviderTest {
+
+  @Test
+  void resourceProviderOrder() throws Exception {
+    boolean containerProviderFound = false;
+    boolean awsProviderFound = false;
+    // verify that aws resource provider is found after the regular container provider
+    // provider that is found later can overrider values from previous providers
+    Class<?> resourceProviderClass =
+        Class.forName(
+            "io.opentelemetry.sdk.autoconfigure.spi.ResourceProvider",
+            false,
+            IntegrationTestUtils.getAgentClassLoader());
+    for (Object resourceProvider :
+        ServiceLoader.load(resourceProviderClass, IntegrationTestUtils.getAgentClassLoader())) {
+      Class<?> clazz = resourceProvider.getClass();
+      if (clazz
+          .getName()
+          .equals("io.opentelemetry.instrumentation.resources.ContainerResourceProvider")) {
+        containerProviderFound = true;
+        assertFalse(awsProviderFound);
+      } else if (clazz.getName().startsWith("io.opentelemetry.contrib.aws.resource.")) {
+        awsProviderFound = true;
+        assertTrue(containerProviderFound);
+      }
+    }
+    assertTrue(containerProviderFound);
+    assertTrue(awsProviderFound);
+  }
+}