test: adds test to verify visitables

Signed-off-by: Marc Nuri <[email protected]>

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

@@ -0,0 +1,53 @@
+/**
+ * Copyright (C) 2015 Red Hat, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.fabric8.kubernetes.client;
+
+import io.fabric8.kubernetes.api.builder.TypedVisitor;
+import io.fabric8.kubernetes.api.model.ContainerBuilder;
+import io.fabric8.kubernetes.api.model.KubernetesListBuilder;
+import io.fabric8.kubernetes.api.model.apps.DeploymentBuilder;
+import org.junit.jupiter.api.Disabled;
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class VisitorTest {
+
+  @Test
+  @Disabled("https://github.com/sundrio/sundrio/issues/438")
+  void visitorShouldVisitOnlyOnce() {
+    // Given
+    final AtomicInteger counter = new AtomicInteger();
+    final KubernetesListBuilder listBuilder = new KubernetesListBuilder();
+    listBuilder.addToItems(
+      new DeploymentBuilder()
+        .withNewSpec().withNewTemplate().withNewSpec().addNewContainer()
+        .withImage("foo")
+        .endContainer().endSpec().endTemplate().endSpec()
+    );
+    // When
+    listBuilder.accept(new TypedVisitor<ContainerBuilder>() {
+      @Override
+      public void visit(ContainerBuilder containerBuilder) {
+        counter.incrementAndGet();
+      }
+    });
+    // Then
+    assertThat(counter).hasValue(1);
+  }
+}