diff --git a/src/main/java/org/codehaus/plexus/testing/PlexusExtension.java b/src/main/java/org/codehaus/plexus/testing/PlexusExtension.java
index c45e782..7eb5458 100644
--- a/src/main/java/org/codehaus/plexus/testing/PlexusExtension.java
+++ b/src/main/java/org/codehaus/plexus/testing/PlexusExtension.java
@@ -98,9 +98,9 @@ public PlexusContainer get() {
     public void beforeEach(ExtensionContext context) throws Exception {
         setTestBasedir(getDefaultBasedir(), context);
 
-        ((DefaultPlexusContainer) getContainer(context))
-                .addPlexusInjector(
-                        Collections.emptyList(), binder -> binder.requestInjection(context.getRequiredTestInstance()));
+        context.getRequiredTestInstances().getAllInstances().forEach(testInstance -> ((DefaultPlexusContainer)
+                        getContainer(context))
+                .addPlexusInjector(Collections.emptyList(), binder -> binder.requestInjection(testInstance)));
     }
 
     private PlexusContainer setupContainer(ExtensionContext context) {
@@ -175,17 +175,19 @@ protected void customizeContainerConfiguration(ContainerConfiguration containerC
 
     private void testInstanceCustomizeContainerConfiguration(
             ContainerConfiguration containerConfiguration, ExtensionContext context) {
-        Object testInstance = context.getRequiredTestInstance();
-        if (testInstance instanceof PlexusTestConfiguration) {
-            ((PlexusTestConfiguration) testInstance).customizeConfiguration(containerConfiguration);
-        }
+        context.getRequiredTestInstances().getAllInstances().forEach(testInstance -> {
+            if (testInstance instanceof PlexusTestConfiguration) {
+                ((PlexusTestConfiguration) testInstance).customizeConfiguration(containerConfiguration);
+            }
+        });
     }
 
     private void testInstanceCustomizeContainer(PlexusContainer container, ExtensionContext context) {
-        Object testInstance = context.getRequiredTestInstance();
-        if (testInstance instanceof PlexusTestConfiguration) {
-            ((PlexusTestConfiguration) testInstance).customizeContainer(container);
-        }
+        context.getRequiredTestInstances().getAllInstances().forEach(testInstance -> {
+            if (testInstance instanceof PlexusTestConfiguration) {
+                ((PlexusTestConfiguration) testInstance).customizeContainer(container);
+            }
+        });
     }
 
     protected void customizeContext(Context context) {}
diff --git a/src/test/java/org/codehaus/plexus/testing/PlexusTestCustomizeTest.java b/src/test/java/org/codehaus/plexus/testing/PlexusTestCustomizeTest.java
index 6e5af9c..0aa8dee 100644
--- a/src/test/java/org/codehaus/plexus/testing/PlexusTestCustomizeTest.java
+++ b/src/test/java/org/codehaus/plexus/testing/PlexusTestCustomizeTest.java
@@ -22,6 +22,7 @@
 import javax.inject.Inject;
 
 import org.codehaus.plexus.PlexusContainer;
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.Mock;
@@ -62,5 +63,14 @@ void dependencyShouldBeInjected() {
         assertNotNull(testJavaxComponent);
         assertSame(testJavaxComponent.getTestComponent2(), mockComponent2);
     }
+
+    @Nested
+    class NestedTest {
+        @Test
+        void nestedDependencyShouldAlsoBeInjected() {
+            assertNotNull(testJavaxComponent);
+            assertSame(testJavaxComponent.getTestComponent2(), mockComponent2);
+        }
+    }
 }
 // END SNIPPET: test-customize-class
diff --git a/src/test/java/org/codehaus/plexus/testing/PlexusTestJavaxTest.java b/src/test/java/org/codehaus/plexus/testing/PlexusTestJavaxTest.java
index b2a07b3..082cea8 100644
--- a/src/test/java/org/codehaus/plexus/testing/PlexusTestJavaxTest.java
+++ b/src/test/java/org/codehaus/plexus/testing/PlexusTestJavaxTest.java
@@ -21,6 +21,7 @@
 // START SNIPPET: test-class
 import javax.inject.Inject;
 
+import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertNotNull;
@@ -36,5 +37,14 @@ void dependencyShouldBeInjected() {
         assertNotNull(testJavaxComponent);
         assertNotNull(testJavaxComponent.getTestComponent2());
     }
+
+    @Nested
+    class NestedTest {
+        @Test
+        void nestedDependencyShouldAlsoBeInjected() {
+            assertNotNull(testJavaxComponent);
+            assertNotNull(testJavaxComponent.getTestComponent2());
+        }
+    }
 }
 // END SNIPPET: test-class