uros-b commented on code in PR #17767:
URL: https://github.com/apache/iceberg/pull/17767#discussion_r3839620408


##########
core/src/test/java/org/apache/iceberg/rest/TestDuplicatePageToken.java:
##########
@@ -0,0 +1,175 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.iceberg.rest;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyMap;
+import static org.mockito.ArgumentMatchers.anyString;
+import static org.mockito.Mockito.when;
+
+import java.util.function.Consumer;
+import org.apache.iceberg.catalog.Namespace;
+import org.apache.iceberg.catalog.SessionCatalog;
+import org.apache.iceberg.catalog.TableIdentifier;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
+import org.apache.iceberg.rest.responses.ConfigResponse;
+import org.apache.iceberg.rest.responses.ListNamespacesResponse;
+import org.apache.iceberg.rest.responses.ListTablesResponse;
+import org.apache.iceberg.rest.responses.ErrorResponse;
+import org.junit.jupiter.api.Test;
+import org.mockito.Mockito;
+
+public class TestDuplicatePageToken {
+
+  @Test
+  @SuppressWarnings("unchecked")
+  public void testListNamespacesThrowsOnDuplicatePageToken() {
+    RESTClient mockClient = Mockito.mock(RESTClient.class);
+
+    // withAuthSession is a default method that returns this; stub it since 
Mockito
+    // does not execute default methods by default
+    when(mockClient.withAuthSession(any())).thenReturn(mockClient);
+
+    // Config response with namespace listing endpoint enabled
+    ConfigResponse configResponse =
+        ConfigResponse.builder()
+            .withEndpoints(ImmutableList.of(Endpoint.V1_LIST_NAMESPACES))
+            .build();
+    when(mockClient.get(
+            anyString(),
+            anyMap(),
+            Mockito.eq(ConfigResponse.class),
+            anyMap(),
+            any(Consumer.class)))
+        .thenReturn(configResponse);
+
+    // Namespace listing: always return the same page token "stuck"
+    ListNamespacesResponse dupResponse =
+        ListNamespacesResponse.builder()
+            .add(Namespace.of("demo"))
+            .nextPageToken("stuck")
+            .build();
+    when(mockClient.get(
+            anyString(),
+            anyMap(),
+            Mockito.eq(ListNamespacesResponse.class),
+            anyMap(),
+            any(Consumer.class)))
+        .thenReturn(dupResponse);
+
+    RESTCatalog catalog =
+        new RESTCatalog(
+            SessionCatalog.SessionContext.createEmpty(), (config) -> 
mockClient);
+    catalog.initialize("test", ImmutableMap.of());
+
+    assertThatThrownBy(() -> catalog.listNamespaces())
+        .isInstanceOf(IllegalStateException.class)
+        .hasMessageContaining("duplicate page token");
+  }
+
+  @Test
+  @SuppressWarnings("unchecked")
+  public void testListTablesThrowsOnDuplicatePageToken() {
+    RESTClient mockClient = Mockito.mock(RESTClient.class);
+
+    when(mockClient.withAuthSession(any())).thenReturn(mockClient);
+
+    // Config response with table listing endpoint enabled
+    ConfigResponse configResponse =
+        ConfigResponse.builder()
+            .withEndpoints(ImmutableList.of(Endpoint.V1_LIST_TABLES))
+            .build();
+    when(mockClient.get(
+            anyString(),
+            anyMap(),
+            Mockito.eq(ConfigResponse.class),
+            anyMap(),
+            any(Consumer.class)))
+        .thenReturn(configResponse);
+
+    // Table listing: always return the same page token "stuck"
+    ListTablesResponse dupResponse =
+        ListTablesResponse.builder()
+            .add(TableIdentifier.of(Namespace.of("demo"), "t1"))
+            .nextPageToken("stuck")
+            .build();
+    when(mockClient.get(
+            anyString(),
+            anyMap(),
+            Mockito.eq(ListTablesResponse.class),
+            anyMap(),
+            any(Consumer.class)))
+        .thenReturn(dupResponse);
+
+    RESTCatalog catalog =
+        new RESTCatalog(
+            SessionCatalog.SessionContext.createEmpty(), (config) -> 
mockClient);
+    catalog.initialize("test", ImmutableMap.of());
+
+    assertThatThrownBy(() -> catalog.listTables(Namespace.of("demo")))
+        .isInstanceOf(IllegalStateException.class)
+        .hasMessageContaining("duplicate page token");
+  }
+
+  @Test
+  @SuppressWarnings("unchecked")
+  public void testListViewsThrowsOnDuplicatePageToken() {
+    RESTClient mockClient = Mockito.mock(RESTClient.class);
+
+    when(mockClient.withAuthSession(any())).thenReturn(mockClient);
+
+    // Config response with view listing endpoint enabled
+    ConfigResponse configResponse =
+        ConfigResponse.builder()
+            .withEndpoints(ImmutableList.of(Endpoint.V1_LIST_VIEWS))
+            .build();
+    when(mockClient.get(
+            anyString(),
+            anyMap(),
+            Mockito.eq(ConfigResponse.class),
+            anyMap(),
+            any(Consumer.class)))
+        .thenReturn(configResponse);
+
+    // View listing: always return the same page token "stuck"
+    ListTablesResponse dupResponse =
+        ListTablesResponse.builder()
+            .add(TableIdentifier.of(Namespace.of("demo"), "v1"))
+            .nextPageToken("stuck")
+            .build();
+    when(mockClient.get(
+            anyString(),
+            anyMap(),
+            Mockito.eq(ListTablesResponse.class),
+            anyMap(),
+            any(Consumer.class)))
+        .thenReturn(dupResponse);
+
+    RESTCatalog catalog =
+        new RESTCatalog(
+            SessionCatalog.SessionContext.createEmpty(), (config) -> 
mockClient);
+    catalog.initialize("test", ImmutableMap.of());
+
+    assertThatThrownBy(() -> catalog.listViews(Namespace.of("demo")))
+        .isInstanceOf(IllegalStateException.class)
+        .hasMessageContaining("duplicate page token");
+  }
+}

Review Comment:
   ```suggestion
   }
   
   ```



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