test: test cause of BatchUpdateException (googleapis#1974)

Author: olavloite

src/test/java/com/google/cloud/spanner/jdbc/BatchMockServerTest.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2025 Google LLC
+ *
+ * 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 com.google.cloud.spanner.jdbc;
+
+import static com.google.cloud.spanner.jdbc.FallbackToPartitionedDMLMockServerTest.createTransactionMutationLimitExceededException;
+import static org.junit.Assert.assertArrayEquals;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertThrows;
+
+import com.google.cloud.spanner.MockSpannerServiceImpl.StatementResult;
+import com.google.cloud.spanner.SpannerBatchUpdateException;
+import com.google.cloud.spanner.TransactionMutationLimitExceededException;
+import com.google.cloud.spanner.connection.AbstractMockServerTest;
+import com.google.spanner.v1.ExecuteBatchDmlRequest;
+import com.google.spanner.v1.ExecuteSqlRequest;
+import java.sql.BatchUpdateException;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.sql.Statement;
+import org.junit.After;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+@RunWith(JUnit4.class)
+public class BatchMockServerTest extends AbstractMockServerTest {
+  private static final String NON_PARAMETERIZED_INSERT =
+      "insert into foo (id, value) values (1, 'One')";
+  private static final String NON_PARAMETERIZED_UPDATE = "update foo set value='Zero' where id=0";
+  private static final String LARGE_UPDATE = "update foo set value='Zero' where true";
+
+  @BeforeClass
+  public static void setup() {
+    mockSpanner.putStatementResult(
+        StatementResult.update(
+            com.google.cloud.spanner.Statement.of(NON_PARAMETERIZED_INSERT), 1L));
+    mockSpanner.putStatementResult(
+        StatementResult.update(
+            com.google.cloud.spanner.Statement.of(NON_PARAMETERIZED_UPDATE), 1L));
+    mockSpanner.putStatementResult(
+        StatementResult.exception(
+            com.google.cloud.spanner.Statement.of(LARGE_UPDATE),
+            createTransactionMutationLimitExceededException()));
+  }
+
+  @After
+  public void clearRequests() {
+    mockSpanner.clearRequests();
+  }
+
+  @Test
+  public void testStatementBatch() throws SQLException {
+    try (Connection connection = createJdbcConnection()) {
+      try (Statement statement = connection.createStatement()) {
+        statement.addBatch(NON_PARAMETERIZED_INSERT);
+        statement.addBatch(NON_PARAMETERIZED_UPDATE);
+        assertArrayEquals(new int[] {1, 1}, statement.executeBatch());
+      }
+    }
+    assertEquals(1, mockSpanner.countRequestsOfType(ExecuteBatchDmlRequest.class));
+    assertEquals(0, mockSpanner.countRequestsOfType(ExecuteSqlRequest.class));
+  }
+
+  @Test
+  public void testStatementBatchFailsDueToMutationLimit() throws SQLException {
+    try (Connection connection = createJdbcConnection()) {
+      try (Statement statement = connection.createStatement()) {
+        statement.addBatch(NON_PARAMETERIZED_INSERT);
+        statement.addBatch(LARGE_UPDATE);
+
+        BatchUpdateException batchUpdateException =
+            assertThrows(BatchUpdateException.class, statement::executeBatch);
+        assertNotNull(batchUpdateException.getCause());
+        assertEquals(SpannerBatchUpdateException.class, batchUpdateException.getCause().getClass());
+        assertNotNull(batchUpdateException.getCause().getCause());
+        assertEquals(
+            TransactionMutationLimitExceededException.class,
+            batchUpdateException.getCause().getCause().getClass());
+      }
+    }
+    assertEquals(1, mockSpanner.countRequestsOfType(ExecuteBatchDmlRequest.class));
+    assertEquals(0, mockSpanner.countRequestsOfType(ExecuteSqlRequest.class));
+  }
+}