improve: add test for startup with no right and no stop config (#2024)

Author: csviri

Diff for: operator-framework/src/test/java/io/javaoperatorsdk/operator/InformerErrorHandlerStartIT.java

@@ -0,0 +1,47 @@
+package io.javaoperatorsdk.operator;
+
+import java.time.Duration;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+import io.fabric8.kubernetes.api.model.ConfigMap;
+import io.fabric8.kubernetes.client.ConfigBuilder;
+import io.fabric8.kubernetes.client.KubernetesClient;
+import io.fabric8.kubernetes.client.KubernetesClientBuilder;
+import io.javaoperatorsdk.operator.api.reconciler.Context;
+import io.javaoperatorsdk.operator.api.reconciler.ControllerConfiguration;
+import io.javaoperatorsdk.operator.api.reconciler.Reconciler;
+import io.javaoperatorsdk.operator.api.reconciler.UpdateControl;
+
+class InformerErrorHandlerStartIT {
+  /**
+   * Test showcases that the operator starts even if there is no access right for some resource.
+   */
+  @Test
+  @Timeout(5)
+  void operatorStart() {
+    KubernetesClient client = new KubernetesClientBuilder()
+        .withConfig(new ConfigBuilder()
+            .withImpersonateUsername("user-with-no-rights")
+            .build())
+        .build();
+
+    Operator operator = new Operator(o -> o
+        .withKubernetesClient(client)
+        .withStopOnInformerErrorDuringStartup(false)
+        .withCacheSyncTimeout(Duration.ofSeconds(2)));
+    operator.register(new ConfigMapReconciler());
+    operator.start();
+  }
+
+  @ControllerConfiguration
+  public static class ConfigMapReconciler implements Reconciler<ConfigMap> {
+    @Override
+    public UpdateControl<ConfigMap> reconcile(ConfigMap resource, Context<ConfigMap> context)
+        throws Exception {
+      return UpdateControl.noUpdate();
+    }
+  }
+
+}