add more tests

Author: zeitlinger

instrumentation/opentelemetry-api/opentelemetry-api-1.56/javaagent/src/test/java/io/opentelemetry/javaagent/instrumentation/opentelemetryapi/v1_56/incubator/ExtendedOpenTelemetryTest.java

@@ -34,5 +34,8 @@ void getConfig() {
     DeclarativeConfigProperties instrumentationConfig =
         ((ExtendedOpenTelemetry) openTelemetry).getConfigProvider().getInstrumentationConfig();
     assertThat(instrumentationConfig).isNotNull();
+
+    assertThat(instrumentationConfig.getStructured("java").getStructured("foo").getString("bar"))
+        .isEqualTo("baz");
   }
 }

instrumentation/opentelemetry-api/opentelemetry-api-1.56/javaagent/src/test/resources/declarative-config.yaml

@@ -5,3 +5,9 @@ tracer_provider:
     - simple:
         exporter:
           console:
+
+instrumentation/development:
+  java:
+    foo:
+      bar: baz
+