chore: add test to show type inference issue

kubernetes-client-api/src/test/java/io/fabric8/kubernetes/client/TypeInferenceTest.java

@@ -0,0 +1,56 @@
+package io.fabric8.kubernetes.client;
+
+import io.fabric8.kubernetes.api.model.ConfigMap;
+import io.fabric8.kubernetes.api.model.HasMetadata;
+import io.fabric8.kubernetes.api.model.Service;
+import io.fabric8.kubernetes.api.model.apps.Deployment;
+import org.junit.jupiter.api.Test;
+
+import java.util.Arrays;
+import java.util.Optional;
+
+class TypeInferenceTest {
+
+  @Test
+  void test() {
+    final ConfigMapDependentResource cdr = new ConfigMapDependentResource();
+    final DeploymentDependentResource ddr = new DeploymentDependentResource();
+    Arrays.asList(cdr, ddr).forEach(dr -> dr.reconcile());
+  }
+
+  static abstract class KubernetesDependentResource<R extends HasMetadata, P extends HasMetadata>
+      implements DependentResourceConfigurator<KubernetesDependentConfig<R>> {
+    void reconcile() {
+      // NOOP
+    }
+
+    @Override
+    public void configureWith(KubernetesDependentConfig<R> config) {
+
+    }
+
+    @Override
+    public Optional<KubernetesDependentConfig<R>> configuration() {
+      return Optional.empty();
+    }
+  }
+
+  static class KubernetesDependentConfig<R extends HasMetadata> {
+
+  }
+
+  interface DependentResourceConfigurator<C> {
+    void configureWith(C config);
+
+    Optional<C> configuration();
+  }
+
+  static final class ConfigMapDependentResource extends KubernetesDependentResource<ConfigMap, Service> {
+
+  }
+
+  static final class DeploymentDependentResource extends KubernetesDependentResource<Deployment, Service> {
+
+  }
+
+}