Add gateway bridge related tests

Author: manuel-alvarez-alvarez

dd-java-agent/appsec/src/test/groovy/com/datadog/appsec/gateway/GatewayBridgeSpecification.groovy

@@ -99,6 +99,7 @@ class GatewayBridgeSpecification extends DDSpecification {
   BiFunction<RequestContext, StoredBodySupplier, Void> requestBodyStartCB
   BiFunction<RequestContext, StoredBodySupplier, Flow<Void>> requestBodyDoneCB
   BiFunction<RequestContext, Object, Flow<Void>> requestBodyProcessedCB
+  BiFunction<RequestContext, Object, Flow<Void>> responseBodyCB
   BiFunction<RequestContext, Integer, Flow<Void>> responseStartedCB
   TriConsumer<RequestContext, String, String> respHeaderCB
   Function<RequestContext, Flow<Void>> respHeadersDoneCB
@@ -449,6 +450,7 @@ class GatewayBridgeSpecification extends DDSpecification {
     1 * ig.registerCallback(EVENTS.requestBodyStart(), _) >> { requestBodyStartCB = it[1]; null }
     1 * ig.registerCallback(EVENTS.requestBodyDone(), _) >> { requestBodyDoneCB = it[1]; null }
     1 * ig.registerCallback(EVENTS.requestBodyProcessed(), _) >> { requestBodyProcessedCB = it[1]; null }
+    1 * ig.registerCallback(EVENTS.responseBody(), _) >> { responseBodyCB = it[1]; null }
     1 * ig.registerCallback(EVENTS.responseStarted(), _) >> { responseStartedCB = it[1]; null }
     1 * ig.registerCallback(EVENTS.responseHeader(), _) >> { respHeaderCB = it[1]; null }
     1 * ig.registerCallback(EVENTS.responseHeaderDone(), _) >> { respHeadersDoneCB = it[1]; null }
@@ -1314,4 +1316,17 @@ class GatewayBridgeSpecification extends DDSpecification {
     0 * traceSegment.setTagTop(_, _)
   }
 
+  void 'test on response body callback'() {
+    when:
+    responseBodyCB.apply(ctx, [test: 'this is a test'])
+
+    then:
+    1 * eventDispatcher.getDataSubscribers(KnownAddresses.RESPONSE_BODY_OBJECT) >> nonEmptyDsInfo
+    1 * eventDispatcher.publishDataEvent(_, _, _, _) >> {
+      final bundle = it[2] as DataBundle
+      final body = bundle.get(KnownAddresses.RESPONSE_BODY_OBJECT)
+      assert body['test'] == 'this is a test'
+    }
+  }
+
 }