jackye1995 commented on code in PR #6965:
URL: https://github.com/apache/iceberg/pull/6965#discussion_r1129084416


##########
spark/v3.3/spark/src/test/java/org/apache/iceberg/spark/sql/TestUnpartitionedWritesToBranch.java:
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@@ -0,0 +1,61 @@
+/*
+ * 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.sql;
+
+import java.util.Map;
+import org.apache.iceberg.Table;
+import org.apache.iceberg.exceptions.ValidationException;
+import org.assertj.core.api.Assertions;
+import org.junit.Test;
+
+public class TestUnpartitionedWritesToBranch extends TestUnpartitionedWrites {
+
+  private static final String BRANCH = "test";
+
+  public TestUnpartitionedWritesToBranch(
+      String catalogName, String implementation, Map<String, String> config) {
+    super(catalogName, implementation, config);
+  }
+
+  @Override
+  public void createTables() {
+    super.createTables();
+    Table table = validationCatalog.loadTable(tableIdent);
+    table.manageSnapshots().createBranch(BRANCH, 
table.currentSnapshot().snapshotId()).commit();
+    sql("REFRESH TABLE " + tableName);
+  }
+
+  @Override
+  protected String commitTarget() {
+    return String.format("%s.branch_%s", tableName, BRANCH);
+  }
+
+  @Override
+  protected String selectTarget() {
+    return String.format("%s VERSION AS OF '%s'", tableName, BRANCH);
+  }
+
+  @Test
+  public void testInsertIntoNonExistingBranchFails() {

Review Comment:
   I will add a few more tests for MERGE, UPDATE and DELETE, but they go 
through the same SparkTable code path and will all fail at the same place.



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