1 files changed, 11 insertions, 2 deletions
diff --git a/java/dagger/hilt/processor/internal/root/RootProcessingStep.java b/java/dagger/hilt/processor/internal/root/RootProcessingStep.java
index f281995d9..d6de432bc 100644
--- a/java/dagger/hilt/processor/internal/root/RootProcessingStep.java
+++ b/java/dagger/hilt/processor/internal/root/RootProcessingStep.java
@@ -57,6 +57,9 @@ import java.util.Set;
 public final class RootProcessingStep extends BaseProcessingStep {
 
   private boolean processed;
+  // TODO(b/297889547) do not run preProcess and postProcess if supported annotation isn't present
+  // in the environment.
+  private boolean hasElementsToProcess = false;
   private GeneratesRootInputs generatesRootInputs;
 
   public RootProcessingStep(XProcessingEnv env) {
@@ -75,13 +78,16 @@ public final class RootProcessingStep extends BaseProcessingStep {
 
   @Override
   public void processEach(ClassName annotation, XElement element) throws Exception {
+    hasElementsToProcess = true;
     XTypeElement rootElement = XElements.asTypeElement(element);
     // TODO(bcorso): Move this logic into a separate isolating processor to avoid regenerating it
     // for unrelated changes in Gradle.
     RootType rootType = RootType.of(rootElement);
     if (rootType.isTestRoot()) {
-      new TestInjectorGenerator(processingEnv(), TestRootMetadata.of(processingEnv(), rootElement))
-          .generate();
+      TestRootMetadata testRootMetadata = TestRootMetadata.of(processingEnv(), rootElement);
+      if (testRootMetadata.skipTestInjectionAnnotation().isEmpty()) {
+        new TestInjectorGenerator(processingEnv(), testRootMetadata).generate();
+      }
     }
 
     XTypeElement originatingRootElement =
@@ -93,6 +99,9 @@ public final class RootProcessingStep extends BaseProcessingStep {
 
   @Override
   protected void postProcess(XProcessingEnv env, XRoundEnv roundEnv) throws Exception {
+    if (!hasElementsToProcess) {
+      return;
+    }
     if (!useAggregatingRootProcessor(processingEnv())) {
       return;
     }