diff --git a/test-suite-groovy/src/test/groovy/io/micronaut/docs/inject/generics/V6.groovy b/test-suite-groovy/src/test/groovy/io/micronaut/docs/inject/generics/V6.groovy
index 71d08c24e49..fc68745203f 100644
--- a/test-suite-groovy/src/test/groovy/io/micronaut/docs/inject/generics/V6.groovy
+++ b/test-suite-groovy/src/test/groovy/io/micronaut/docs/inject/generics/V6.groovy
@@ -3,6 +3,6 @@ package io.micronaut.docs.inject.generics
 // tag::class[]
 class V6 implements CylinderProvider {
     @Override
-    int getCylinders() { 7 }
+    int getCylinders() { 6 }
 }
 // end::class[]
diff --git a/test-suite-groovy/src/test/groovy/io/micronaut/docs/inject/generics/VehicleSpec.groovy b/test-suite-groovy/src/test/groovy/io/micronaut/docs/inject/generics/VehicleSpec.groovy
index 386e8f60617..68264b990aa 100644
--- a/test-suite-groovy/src/test/groovy/io/micronaut/docs/inject/generics/VehicleSpec.groovy
+++ b/test-suite-groovy/src/test/groovy/io/micronaut/docs/inject/generics/VehicleSpec.groovy
@@ -12,5 +12,6 @@ class VehicleSpec extends Specification {
     void 'test start engine'()  {
         expect:
         vehicle.start() == 'Starting V8'
+        [6] == vehicle.v6Engines.collect {engine -> engine.cylinders }
     }
 }
diff --git a/test-suite-kotlin/src/test/kotlin/io/micronaut/docs/inject/generics/V6.kt b/test-suite-kotlin/src/test/kotlin/io/micronaut/docs/inject/generics/V6.kt
index b7a8d10528d..2902c797ecc 100644
--- a/test-suite-kotlin/src/test/kotlin/io/micronaut/docs/inject/generics/V6.kt
+++ b/test-suite-kotlin/src/test/kotlin/io/micronaut/docs/inject/generics/V6.kt
@@ -2,6 +2,6 @@ package io.micronaut.docs.inject.generics
 
 // tag::class[]
 class V6 : CylinderProvider {
-    override val cylinders: Int = 7
+    override val cylinders: Int = 6
 }
-// end::class[]
\ No newline at end of file
+// end::class[]
diff --git a/test-suite-kotlin/src/test/kotlin/io/micronaut/docs/inject/generics/VehicleSpec.kt b/test-suite-kotlin/src/test/kotlin/io/micronaut/docs/inject/generics/VehicleSpec.kt
index 3f034b7c458..a39561b1c5a 100644
--- a/test-suite-kotlin/src/test/kotlin/io/micronaut/docs/inject/generics/VehicleSpec.kt
+++ b/test-suite-kotlin/src/test/kotlin/io/micronaut/docs/inject/generics/VehicleSpec.kt
@@ -9,5 +9,7 @@ class VehicleSpec(private val vehicle: Vehicle) {
     @Test
     fun testStartVehicle() {
         assertEquals("Starting V8", vehicle.start())
+        assertEquals(listOf(6), vehicle.v6Engines
+                .map { it.cylinders })
     }
-}
\ No newline at end of file
+}
diff --git a/test-suite/src/test/java/io/micronaut/docs/inject/generics/V6.java b/test-suite/src/test/java/io/micronaut/docs/inject/generics/V6.java
index ebe5c3fcbf2..4aa031cc573 100644
--- a/test-suite/src/test/java/io/micronaut/docs/inject/generics/V6.java
+++ b/test-suite/src/test/java/io/micronaut/docs/inject/generics/V6.java
@@ -4,7 +4,7 @@
 public class V6 implements CylinderProvider {
     @Override
     public int getCylinders() {
-        return 7;
+        return 6;
     }
 }
 // end::class[]
diff --git a/test-suite/src/test/java/io/micronaut/docs/inject/generics/VehicleSpec.java b/test-suite/src/test/java/io/micronaut/docs/inject/generics/VehicleSpec.java
index 5626029a9a0..7a0252f0614 100644
--- a/test-suite/src/test/java/io/micronaut/docs/inject/generics/VehicleSpec.java
+++ b/test-suite/src/test/java/io/micronaut/docs/inject/generics/VehicleSpec.java
@@ -2,6 +2,10 @@
 
 import io.micronaut.test.extensions.junit5.annotation.MicronautTest;
 import org.junit.jupiter.api.Test;
+
+import java.util.Collections;
+import java.util.stream.Collectors;
+
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 
@@ -16,6 +20,10 @@ public VehicleSpec(Vehicle vehicle) {
     @Test
     public void testStartVehicle() {
         assertEquals("Starting V8", vehicle.start());
+        assertEquals(Collections.singletonList(6), vehicle.v6Engines
+            .stream()
+            .map(Engine::getCylinders)
+            .collect(Collectors.toList()));
     }
 
-}
\ No newline at end of file
+}