kbendick commented on a change in pull request #3543:
URL: https://github.com/apache/iceberg/pull/3543#discussion_r767196258



##########
File path: 
spark/v3.2/spark/src/test/java/org/apache/iceberg/spark/source/TestSparkCatalogCacheExpiration.java
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@@ -0,0 +1,134 @@
+/*
+ * 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.spark.source;
+
+import java.util.Map;
+import org.apache.iceberg.CachingCatalog;
+import org.apache.iceberg.CatalogProperties;
+import org.apache.iceberg.catalog.Catalog;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
+import org.apache.iceberg.spark.SparkCatalog;
+import org.apache.iceberg.spark.SparkCatalogTestBase;
+import org.apache.spark.sql.connector.catalog.TableCatalog;
+import org.assertj.core.api.Assertions;
+import org.junit.Test;
+import org.junit.runners.Parameterized;
+
+public class TestSparkCatalogCacheExpiration extends SparkCatalogTestBase {

Review comment:
       So there are now 4 tests. There are a lot of possible combinations to 
test, let me know which ones you think I should remove.
   
   1. TestSparkCatalogCacheExpirationDisabled
     1a. Checks that CachingCatalog is not used  when 
cache.expiration-interval-millis=0 (this one seems important).
   2. TestSparkCatalogCacheExpirationEnabled
     2a. Check with cache-enabled and expiration enabled via 30s (in millis)
     2b. Check with cache-enabled and expiration disabled via `-1`
   3. TestSparkSessionCatalogCacheExpiration
     3a. Same as 2a, but using the SparkSessionCatalog
   
   I think that 1a is important to have a test that verifies that behavior, 
same with 2b. If we wanted to get rid of a test, I would vote for 2a and just 
use 3a instead (since that tests the same behavior but ALSO ensures that the 
SparkSessionCatalog works with the new configs as well).




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