Prevent simultaneous use of @InjectMock and @InjectSpy

Closes: #50163

Author: geoand

integration-tests/rest-client-reactive/src/test/java/io/quarkus/it/rest/client/InjectMockTest.java

@@ -13,13 +13,15 @@
 import io.quarkus.it.rest.client.main.MyResponseExceptionMapper;
 import io.quarkus.test.InjectMock;
 import io.quarkus.test.junit.QuarkusTest;
+import io.quarkus.test.junit.mockito.InjectSpy;
 import io.restassured.RestAssured;
 
 @QuarkusTest
 @Order(100) // used in order to make sure this is run before ShouldNotUseMockTest
 public class InjectMockTest {
 
     @InjectMock
+    @InjectSpy
     @RestClient
     ClientWithExceptionMapper mock;
 

test-framework/junit5-mockito/src/main/java/io/quarkus/test/junit/mockito/internal/CreateMockitoSpiesCallback.java

@@ -12,6 +12,7 @@
 import io.quarkus.arc.ClientProxy;
 import io.quarkus.arc.InjectableContext;
 import io.quarkus.arc.InstanceHandle;
+import io.quarkus.test.InjectMock;
 import io.quarkus.test.junit.callback.QuarkusTestAfterAllCallback;
 import io.quarkus.test.junit.callback.QuarkusTestAfterConstructCallback;
 import io.quarkus.test.junit.callback.QuarkusTestContext;
@@ -35,6 +36,12 @@ public void afterConstruct(Object testInstance) {
         while (current.getSuperclass() != null) {
             for (Field field : current.getDeclaredFields()) {
                 InjectSpy injectSpyAnnotation = field.getAnnotation(InjectSpy.class);
+                InjectMock injectMockAnnotation = field.getAnnotation(InjectMock.class);
+                if (injectMockAnnotation != null) {
+                    throw new IllegalArgumentException(
+                            "Fields cannot be annotated with both @InjectSpy and @InjectMock. Offending field is '"
+                                    + field.getDeclaringClass().getName() + "#" + field.getName() + "'");
+                }
                 if (injectSpyAnnotation != null) {
                     InstanceHandle<?> beanHandle = CreateMockitoMocksCallback.getBeanHandle(testInstance, field,
                             InjectSpy.class);